If the light on the regulator relay does not light up. The battery light is on - causes and solutions. Why is the battery light on the dashboard constantly on

On domestic cars, the dashboard is not informative enough. However, it has all the main indicators of the operation of the main units and systems of the vehicle. Sometimes a situation occurs when something fails, but it is impossible to determine the malfunction at the initial stage.

From this article you will find out why the battery charging lamp is constantly on or a weak indication appears. Why this is happening and what to do, read on.

The main purpose of the battery warning lamp

The indicator in question is intended so that the driver knows whether the battery is charging or the entire electrical network is powered directly from the battery while driving.

When the ignition is turned on, all warning lamps come on; during the start of the internal combustion engine, all indicators should go out. In this case, the battery charging system is working and there is nothing to worry about.

Otherwise, if the battery lamp is still on, then you should look for a malfunction.

The battery lamp is on - what does this mean

There can be only one reason for the battery warning lamp to light up during engine operation - this is the lack of voltage supply from the generator or its value is insufficient.

The main malfunctions that lead to this:

1. Lack of quality contact on the battery terminals.
2. Damaged alternator belt or loose tension.
3. There is no contact of the "minus" with the mass.
4. Open circuit in the rotor excitation circuit or wear of the brushes in the generator.
5. Diode bridge breakdowns are usually accompanied by a dim burning of the battery light on the dashboard.
6. Fuse defective.
7. Failure of the relay regulator.

Before you start troubleshooting, pay attention to why the lamp is on. If the voltage is not supplied to the battery at all, then the lamp is on correctly. In a different situation, the operation of the signal indicator when charging is present greatly complicates the problem.

First of all, determine if there is voltage on the battery. To do this, take a voltmeter (multimeter), start the motor and measure the required characteristic at the battery terminals.

If everything is in good working order, you will see readings in the range of 13.6 to 14.2 V. In this case, the battery is charging properly. If the results obtained are significantly different from normal, then there is some kind of breakdown in the system.

Poor contact at the battery terminals

Diode bridge faults

The electrical circuit is designed to convert AC voltage to DC voltage. If at least one of the diodes breaks down, the functional unit ceases to perform its duties. The consequence of this is the supply of voltage, which does not correspond to the required indicators.

The rectifier must be checked when the battery charging lamp is on, but there is charging.

You can determine the breakdown by using a multimeter. Take a tester and connect the red probe to the positive of the bridge, and the black one to one of the contacts marked AC.

The throughput voltage for diodes (silicon) is 400 to 1000 mV. If the tester shows different values, then the bridge needs to be changed. Such a unit cannot be repaired.

Fuse failure

The battery charging circuitry is protected by a fuse. This element is located in the mounting block of the car and is marked as F10. However, before checking for a malfunction in this place, it is better to first read the operating instructions for the car, in which you will find out the exact designation of the required element.

If the fuse fails, the battery is not charged at all. However, there are times when the warning light comes on and there is charging.

You can check the element using a tester (the part is removed from the mounting block). If the multimeter shows that the fuse is unusable, all you have to do is replace it.

Breakdown of the relay-regulator

A malfunctioning relay regulator is another reason why the battery charging lamp comes on. This node is responsible for turning on / off the alarm indicator.

The principle of operation of the device is as follows: when the ignition is turned on, a current flows through its closed contacts, which comes from the battery and feeds the indicator signals. When the internal combustion engine starts, the generator starts working, which supplies the already rectified voltage to the relay and the contacts of the unit open. At this time, the light should go out.

You can check the part yourself. Disconnect both wires from it and short circuit together. Start the engine and look at the dashboard. If there is no indication, you need to change the relay.

To keep your car from experiencing battery charging problems, follow these tips:

1. Do not ignore the signals from the car dashboard. In this case, you can solve the problem at the initial stage of its development.
2. Inspect the alternator belt regularly. The correct operation of all electrics on board directly depends on it. Replace it as soon as possible if it is defective.
3. Check the voltage from the alternator to the battery. If you notice a discrepancy, diagnose the on-board network.
4. Periodically pay attention to the condition of the battery terminals. If you notice oxidation, eliminate this defect. They can be processed with the WD-40.
5. Isolate the generator and battery from water ingress to prevent short circuits. Trust a professional to wash your engine.
6. Do not use cheap replacement parts to repair the battery charging circuit.

Summing up, we note that the battery is the most important element in the car's electrical network. Therefore, it is necessary to carry out timely maintenance of the charging circuit and, if necessary, change the necessary parts. In this case, you will ensure a proper system of work. In the article, we told you about the main malfunctions from which the battery charging lamp can light up and what to do about it. We hope our recommendations will help you solve the problem under consideration.

Greetings to you friends on the do-it-yourself auto repair site. When the ignition key is turned on, a number of warning lights on the dashboard come on. They signal the health of the system and the readiness of the engine to start.

One of these indicators has an image of the battery. When the ignition is turned on, it starts to light up, and after starting the engine, it goes out.

This signals that the battery is being charged. But what if this did not happen? Why is the battery charging light on even after starting up?

A little theory: the scheme of work

To solve the existing problem, you must understand the essence of the interaction between the vehicle generator and the power source (battery).

In the process of movement, the battery is in a constant recharging mode with a voltage of 13.6-14.2 volts. With an increase in engine speed, the voltage at the generator output increases. But this is unacceptable.

To limit the voltage, a small relay-regulator cuts into the rotor excitation circuit. Its task is to reduce the current to a normal level (even with a significant increase in the number of revolutions).

The result is the maintenance of the battery charge voltage at a stable level. If the battery light is on, this indicates that there is no charging from the generator.

How does the circuit work? After turning on the ignition, voltage is supplied through fuse No. 10 (for VAZ-2107) to the battery charge indicator lamp.

Further, the voltage "+ 12V" passes through a diode, a built-in relay-regulator (we mentioned it above), a brush, a slip ring and a winding.

As soon as the rotor speed increases, the phase voltage also increases. As a result, the voltage at the terminals of the battery warning light is equalized, and it goes out. In this case, the battery is being charged.

Reasons why the battery charging light is on

In fact, there are many reasons that the battery light comes on and does not go out. These include:

• Weakening of the belt tension on the generator, its wear or damage;
• blown fuse or deterioration of the contact quality in the connectors of the mounting block;
• breakdown of the relay-regulator, diode bridge, additional diodes;
• the appearance of an open circuit in the excitation circuit of the generator;
• deterioration of the quality of the contact at the battery terminals or the generator output;
• wear generator brushes ;
• lack of high-quality ground wire contact.

What to do if the battery charging light is on?

First of all, get out of the car and, with the engine running, measure the voltage at the battery terminals (never remove the clamps).

If charging is in progress, then the voltage should be at the level of 13.6-14.2 Volts. In the absence of a charge, the voltage level will be much lower - about 12 volts.

Prepare the following tools to fix the problem:

• a control light for twelve volts,
• two screwdrivers (flat and cross-head),
• multimeter,
• pliers,
• knife,
• use sandpaper to clean the contacts.

So let's get started:

1. The readings of the on-board voltmeter indicate the presence of a charge, the charge warning lamp on dashboard does not light up, there are about 12 volts at the battery terminals, and the battery itself is almost discharged.

In such a situation, strip the wire connections on the power source itself. If these measures were unsuccessful, measure the voltage level at terminal "30" of the generator itself.

Sit down with one probe of the multimeter on this terminal, and with the other - on "ground". If the voltage here is much higher than on the battery, then strip the thirtieth terminal. Replace the wire from the generator to the battery if necessary.

2. The voltmeter on the dashboard and the lamp indicate the presence of charge, but the battery is discharged.

The voltage on the battery is normal (about 14 volts). Turning on the load (for example, headlights) leads to the displacement of the charge arrow to the extreme left position.

The main reason is the weak tension of the belt on the alternator pulley (tighten the belt, and if it is damaged, replace it).

A breakdown of one of the diodes, as well as a break in the stator phase winding, can lead to such a problem. Switch off the ignition and check the diodes with a multimeter. Replace them in case of breakdown.

Check generator brushes. To do this, take them out and measure the length. If it is less than five millimeters, then it is better to replace the brushes.

3. When the key is turned in the ignition lock, the charge warning lamp does not light up, the charge sensor does not work, there is no charge on the battery. The reason is a blown fuse.

Its designation is F10, face value is 10 Amperes. If the installation of a new fuse did not give results, then the reason must be sought in the ignition relay or the lock itself.

4. After turning on the ignition, there is no charge, all devices are working, the control signal lamp does not light up.

The check is simple - remove the wiring from the terminal "sixty-one" of the generator and connect it directly to the "minus" (car body). If the light comes on, then the cause of the problem is the excitation winding of the generator.

The second option is poor contact in the connector. If there is no result after cleaning, then there is a risk of burnout of the lamp itself.

5. When the key is turned in the ignition lock, the charge lamp is on, and after cranking it continues to glow. At the same time, there is no charging or appears periodically. The reason is insufficient contact of the wire on the connector with the dashboard (it can oxidize).

Finally, check the relay regulator. To do this, apply voltage to its contacts from the battery. If there are 12 volts on the brushes, then the relay is working properly. If not, then the device must be replaced.

If you have problems charging the battery (the warning light does not go out or does not light up at all), then check all versions.

But, as a rule, the problem is always on the surface, and the reason is poor contact, a burned out light bulb or a faulty relay-regulator. Good luck on the road and, of course, no breakdowns.

One of the most important elements of any car is its dashboard. It is on it that the main indicators are displayed, which should be given special attention when activated. There is a whole list of malfunctions, the presence of which is indicated by the activation of a certain signal. A lit battery light is a signal that a charge is no longer supplied to the power source, which can provoke problems when starting the vehicle. For this reason, it is highly discouraged to turn off the engine for any manipulations. It is best to diagnose the battery and generator directly in the garage or after reaching your destination.

A little theory: the scheme of work

To solve the existing problem, you must understand the essence of the interaction between the vehicle generator and the power source (battery).

In the process of movement, the battery is in a constant recharging mode with a voltage of 13.6-14.2 volts. With an increase in engine speed, the voltage at the generator output increases. But this is unacceptable.

To limit the voltage, a small relay-regulator cuts into the rotor excitation circuit. Its task is to reduce the current to a normal level (even with a significant increase in the number of revolutions).

The result is the maintenance of the battery charge voltage at a stable level. If the battery light is on, this indicates that there is no charging from the generator.

How does the circuit work? After turning on the ignition, voltage is supplied through fuse No. 10 (for VAZ-2107) to the battery charge indicator lamp.

As soon as the rotor speed increases, the phase voltage also increases. As a result, the voltage at the terminals of the battery warning light is equalized, and it goes out. In this case, the battery is being charged.

Reasons why the battery charging light is on

In fact, there are many reasons that the battery light comes on and does not go out. These include:

• Weakening of the belt tension on the generator, its wear or damage;
• blown fuse or deterioration of the contact quality in the connectors of the mounting block;
• breakdown of the relay-regulator, diode bridge, additional diodes;
• the appearance of an open circuit in the excitation circuit of the generator;
• deterioration of the quality of the contact at the battery terminals or the generator output;
• wear of the generator brushes;
• lack of high-quality ground wire contact.

What to do if the battery charging light is on?

First of all, get out of the car and, with the engine running, measure the voltage at the battery terminals (never remove the clamps).

If charging is in progress, then the voltage should be at the level of 13.6-14.2 Volts. In the absence of a charge, the voltage level will be much lower - about 12 volts.

Prepare the following tools to fix the problem:

• a control light for twelve volts,
• two screwdrivers (flat and cross-head),
• multimeter,
• pliers,
• knife,
• use sandpaper to clean the contacts.

So let's get started:

1. The readings of the on-board voltmeter indicate the presence of charge, the charge warning lamp on the dashboard is off, the battery terminals are about 12 volts, and the battery itself is almost discharged. In such a situation, clean the wire connections at the power source itself. If these measures turned out to be useless, measure the voltage level at the terminal "30" of the generator itself. Sit down on this terminal with one probe of the multimeter, and on the "ground" with the other. If the voltage here is much higher than on the battery, then strip the thirtieth terminal. Replace the wire from the generator to the battery if necessary.
2. The voltmeter on the dashboard and the lamp show the presence of a charge, but the battery is discharged. The voltage on the battery is normal (about 14 volts). Turning on the load (for example, headlights) leads to the displacement of the charge arrow to the extreme left position. The main reason is a weak belt tension on the alternator pulley (tension the belt, and if it is damaged, replace it). Such a problem can also be caused by a breakdown of one of the diodes. , as well as a break in the stator phase winding. Switch off the ignition and check the diodes with a multimeter. Replace them in case of breakdown Check the alternator brushes. To do this, take them out and measure the length. If it is less than five millimeters, then it is better to replace the brushes.
3. When the key is turned in the ignition lock, the charge warning lamp does not light up, the charge sensor does not work, there is no charge on the battery. The reason is a blown fuse. Its designation is F10, the rating is 10 Amperes. If the installation of a new fuse did not give results, then the reason must be looked for in the ignition relay or the lock itself.
4. After turning on the ignition, there is no charge, all devices are working, the control signal lamp does not light up. The check is simple - remove the wiring from the terminal "sixty-one" of the generator and connect it directly to the "minus" (car body). If the light comes on, then the cause of the problem is the excitation winding of the generator. The second option is poor contact in the connector. If there is no result after cleaning, then there is a risk of burnout of the lamp itself.
5. When the key is turned in the ignition lock, the charge lamp is on, and after cranking it continues to flicker. At the same time, there is no charging or appears periodically. The reason is insufficient contact of the wire on the connector with the dashboard (it can oxidize). Finally, check the relay-regulator. To do this, apply voltage to its contacts from the battery. If there are 12 volts on the brushes, then the relay is working properly. If not, then the device must be replaced. If you have problems with charging the battery (the warning lamp does not go out or does not light up at all), then check all versions. But, as a rule, the problem is always on the surface, and the reason is poor contact, a burned out light bulb or a faulty relay-regulator. Good luck on the road and, of course, no breakdowns.

Troubleshooting - Battery

Often, malfunctions that entail a lack of charge occur when the battery is malfunctioning or problems with the generator.

To detect a deviation in the battery performance, it is enough to compare the indicators of the installed in the car and the new power source. In the event that, when replacing this part, the light goes out, it is safe to conclude that a failed battery was the cause of the failures. This can happen as a result of the sulfitation of the plates or their closure. And if in the first case it is possible to reanimate the device by repair, then in the second it will have to be replaced.

It is also worth remembering that battery problems do not always indicate a breakdown. Quite often, the power supply is simply discharged. It is quite easy to check this. In the event that the battery charge level mark is below the usual rate, the power source must be charged and installed in the vehicle. If after that you were able to start the car and the indicator went out, the problem has been eliminated and you can continue to use this battery without fear. But if the required charge level could not be restored even after recharging, you will need to purchase a new battery.

How to identify generator malfunctions

If, after replacing the battery with a new one, the charging indicator does not go out, the cause of the failure is a malfunction of the generator. To determine the lack of voltage supply, you will need to perform manipulations in the order below. Be sure to use personal protective equipment - each manipulation must be carried out with rubber gloves to avoid electric shock. So, in order to identify a breakdown, you need:

Turn off the engine and disconnect the wires from the battery.
Measure the voltage at the terminals with a multimeter. The optimal indicator should be in the range of 12.5-12.7 V.
Connect the wires, turn on the ignition and repeat the voltage measurement procedure again. The indicator should not exceed 13.5-14 V, and grow with increasing speed.
If the voltage drops with increasing speed, this often indicates that the "brushes" of the generator are worn out or the diodes in the diode bridge are out of order. Also, the reason for the interruption of the charge supply may be a weakening or breakage of the belt. You can verify this by performing a visual inspection. Press your fingers on the belt, and if it bends lower than 1.5 centimeters, this directly indicates a loosening of the tension.

Visually, the driver can independently determine the oxidation of the terminals. To do this, you need to pay attention to the generator wires. In the event that they have oxidized, this will be evidenced only by the appearance, but also by the characteristic burning smell.

But also quite often there are global problems that even an experienced motorist cannot cope with without the qualified help of a specialist. It should be noted that such defects as worn-out "brushes" or diodes are completely removable, and more serious problems (open circuit or wear of rotor parts) can be solved only by replacing the generator.

Troubleshooting

If you have identified the reason for the activation of this indicator, it's time to start eliminating it. Below are the main problems and methods for solving them:

• you can eliminate the weakening of the belt or its break by adjusting the degree of tension or resorting to replacing it;
• in order to clean the oxidized terminals, it is enough to clean them using fine-grained emery paper;
• in the event that the battery is discharged as a result of long-term operation of electrical devices with the engine off, it is enough to recharge it;
• in the presence of various internal damages, it is necessary to consult a specialist.

Such malfunctions as faulty "brushes" and generator wires, as well as a break in the winding or breakdown of the relay, are not eliminated with the help of repair. In this case, it is advisable to replace the spare part.

conclusions

By carefully monitoring the readings of the dashboard, you can independently identify problems in the operation of your vehicle at first and avoid serious consequences. We also draw your attention to the fact that in our company you can always order the parts you need. We offer competitive prices and will help you save not only money, but also time, because you do not need to look for the necessary spare part in stores. We guarantee high quality and excellent performance. To place an order, call the contact phone number.

What could be the reason for the lamp that indicates the battery charge level to burn, even with a normally charged battery? This light is one of many that come on when a car engine starts. It should light up at the moment the engine is started and go out after some time. Such a sequence of actions testifies to the complete serviceability of the generator with all its electrical circuits and the supply of voltage to the terminals of the storage battery, the value of which can vary from 13.7 V to 14.3 V, which allows charging the battery.

However, sometimes car owners are faced with situations where the lamp either does not go out at all, or continues to burn at half the incandescence, or does not light up at all. To understand the reasons for this, let's take a short excursion into the description of the device and the principle of operation of the car generator.

The generation of electricity in it occurs due to the rotational movement of the shaft. As the number of revolutions increases, the level of voltage generated by it increases. However, the indicators should not go beyond certain limits, since the recharging process will begin in the battery, which can lead to boiling of the electrolyte and, as a result, sulfitation of the plates. In order to prevent this, a relay-regulator is installed in the excitation circuit of the generator rotor, which ensures the presence of a stable voltage on the battery.

The control lamp is powered through a fuse located in the generator itself. The lamp should light up and stay on until the generator starts up and voltage is supplied to the battery terminals. The chain of passage of the charging current from the generator to the battery contains the following elements:

• diode;
• regulator;
• generator brushes;
• slip rings;
• winding;
• wiring.

Incorrect operation of any of the listed parts may lead to the presence of incorrect information communicated to the driver by means of a control lamp, regardless of whether it occurs or not.

What other reasons can provoke this malfunction

In addition to the above, there are several more reasons for the incorrect operation of the battery charging indicator lamp:

1. So, if it continues to burn to the glowing floor after starting the engine, then the degree of tension of the alternator belt should be checked, since it is its tension that can lead to such a reaction. By the way, the sounds characteristic of this malfunction emanating from under the hood also signal an incorrect belt stretching. In this case, the belt should be tightened to the appropriate level, or, if this cannot be done, it should be replaced.
2. Another common cause is the lack of good contact between the battery terminals and the power wires. This can be caused by the presence of oxidation on the lead terminals or a malfunction of the fasteners of the wires to the battery. Accordingly, it is necessary to clean the terminals or replace the failed elements.
3. In the mechanical part of the generator, the destruction of the bearings can occur, which will inevitably lead to the failure of the bushings. To eliminate this malfunction, the generator will have to be completely removed and a bushing repair kit installed on it.
4. Failure of the diode bridge can interrupt the circuit that supplies power to the battery. There is no point in repairing diode bridges - they just need to be replaced.
5. Malfunction in the relay regulator. Only specialists can deal with this malfunction.
6. The abrasion of the graphite brushes leads to the fact that a full charge is not transferred to the winding, which provokes a dull glow of the light bulb. This indicates that the charging process is still taking place, but very weakly. In this case, you should be guided by the voltmeter readings. And you should immediately replace the worn-out brushes in order to avoid constant undercharging of the battery, which can lead to gradual shedding of the plates.

Ways of detecting the occurred malfunction

First of all, you should measure the voltage at the battery terminals. If the results are below the recommended ones, then it is necessary to check the entire chain step by step:

• check the degree of belt tension;
• measure the voltage at each of the terminals on the generator (its indicators should be two times lower than those obtained from measurements at the battery terminals);
• check the safety of the fuse;
• make sure that the diode bridge is in good working order;
• audit the state of the relay;
• using special devices to measure the resistance of the power circuit;
• inspect the quality of the connection of all wires in the places of their soldering;
• make sure with a tester that there is no open circuit in the power circuit.

Of course, no one is insured against the occurrence of malfunctions, however, there are several simple recommendations, the observance of which allows you to extend the period of trouble-free operation of the entire circuit with and the generator in particular. They look like this:

• regularly check the quality of the generator mounting, since the presence of constant vibrations can lead to mechanical damage;
• the generator surface should be cleaned from dirt from time to time;
• the belt tension must be constantly monitored and, if necessary, tightened;
• periodically, the quality of the rotor bearings should be checked, for which the belt is removed and in the process of turning the rotor manually there should be no backlash and extraneous noise, but it should rotate smoothly and smoothly;
• regularly check the quality of the connection of the wires along the entire battery power circuit.

In conclusion, we can say that the presence of an abnormally burning battery charging light is a serious enough reason to turn to specialists to diagnose all the elements in the power circuit. At the same time, one should not forget that the battery charging lamp may also be on due to the installation of too much additional equipment. This means various lights, additional lights, etc.

There are not only analog gauges on the car dashboard, but also various indicators. One of the main indicators is an icon in the form of a battery, which lights up red when the ignition is turned on, and goes out as soon as the engine starts. If the battery charging lamp on the VAZ 2107 is on after starting the engine, then this indicates a generator malfunction. If the generator is in good working order, and the battery is charging, and the lamp is on, then the reasons for the glow of the indicator must be looked for.

Such bulbs are available in VAZ 2107 injection and carburetor type cars. If, after starting the engine, the indicator in the form of a battery on the VAZ 2107 dashboard continues to glow, then the first opinion of the owner is that the generator is faulty. This is the correct opinion, and in order to find the exact cause, you will need to carry out diagnostic measures. The reasons for the glow of the lamp on the dashboard are:

1. Loose tension of the alternator belt, as well as wear and tear.
2. The fuse link burns out.
3. Malfunction of the relay-regulator, or rectifier (diode) bridge.
4. Open circuit in the generator winding.
5. Deterioration of contact at the battery terminals.
6. Abrasion of graphite brushes on the generator.
7. Lack of contact "mass".

You cannot operate a car with a luminous indicator in the form of a battery on the instrument panel. At any time, the battery can be discharged, since it does not receive a charge from the generator, and the car simply stalls. How much a vehicle can drive with a faulty generator depends on the quality of the battery, its charge and the car's electricity consumption. Usually this period of time is from 10 minutes to 2 hours.

What can the constantly burning battery charging lamp indicate?

Another situation that some owners of domestic cars are familiar with is when the VAZ 2107 battery charging lamp is on, but charging is in progress. What could be the reason, how dangerous it is, and how to eliminate it, we will find out further.

When the battery light is on, and there is charging, then the reasons are also hidden in the malfunctioning of the generator. The battery on the car has an operating voltage of 12V, and for charging it needs to be supplied from 13.5 to 14.4V. In this case, the battery will be charged, and the lamp on the parting panel will not glow when the engine is running. If the indicator glows after starting the engine, then there is a high probability that the generator is supplying insufficient voltage to the battery (that is, below 13.5V). If, while measuring the voltage at the battery terminals with the motor running, the device shows a value of more than 12V, but less than 13.5V, then you need to sound the alarm and start troubleshooting.

To find the cause of the malfunction and successfully eliminate it yourself, consider the other types of possible defects.

Lost contact on the battery terminals

The first step is to check the terminals on the battery. The charging current generated by the generator is supplied to the battery through the terminals, so the slightest presence of oxides on the terminals can lead to a decrease in the charging current (by increasing the resistance).

Oxides can appear on the terminals if you do not disconnect them for a long time. Also, if other than lead terminals are used.

The voltage supplied from the generator is lost (reduced) due to poor contact. With such a malfunction, you can still notice that the charge indication lamp is dimly lit. If so, it is recommended to remove both terminals from the battery and clean them using fine-grained emery paper. After removing the oxides, the terminals should be treated with Litol. Check the absence of light indication when starting the motor.

Loose tension or damage to the alternator belt

If there is a malfunction, it is required to check the condition of the alternator drive belt. In the event of its breakage, charging will not come at all, but when the battery receives a charge, but in an insufficient amount, then its deformation may be the reason. During operation, the belt is stretched, therefore "slippage" can occur.

The belt needs to be tightened or replaced, which will take a little time. With the timely replacement of the belt, no unforeseen situations will happen on the road. Plus, a new belt costs ten times less than a new battery.

Lack of contact of the output of the generator with ground

To do this, you should check the quality of the connection not only of the negative terminal on the battery, but also all the contacts on the generator case. During operation, their fasteners may weaken or oxidize, which will certainly cause a decrease in the value of the charging current.

Breakdowns of this type are eliminated by tightening the contacts with a wrench. Oxidation is removed with WD-40 and sandpaper. To protect the contacts from moisture, they must be lubricated.

Faulty regulator relay

You also need to check the charge indicator lamp relay, which is responsible for turning the charge lamp on and off on the dashboard. When the engine starts and the alternator pulley rotates, generating current, the relay sends a signal to the test lamp to turn it off. The principle of operation of the regulator relay is to perform the following actions:

1. When the ignition is turned on, current flows through the closed contacts to the relay. This current flows from the battery, and goes to the control lamp or indicator.
2. When the engine starts, the generator turns on. The generator generates a charging current that flows to a coil in the relay.
3. Under the influence of current, the core is attracted and the contacts open. The indication lamp on the instrument panel goes out when the contacts are opened.

To fix the breakdown, you will need to replace the relay, which is located on the VAZ 2107 under the hood. On the right side, on the right mudguard, there is a block where the required relay is located. To check the health of the device, you can use the adjacent relay.

Generator malfunctions

If the above methods did not help to solve the problem, and the indicator lamp continues to glow when the engine is running, then you should resort to checking the generator. For this, the equipment is dismantled from the car and checked at home using a test lamp or a tester.

You need to check the contacts on the generator

It is imperative to check the wear of the brushes. If the amount of wear is more than 40%, then they must be replaced. It is also necessary to check the serviceability of the diodes in the diode bridge. In the design of the generator, it is installed to rectify the current from alternating to direct current. If one of the circuit diodes fails, then the value of the current supplying the battery decreases, which contributes to the glow of the indicator on the instrument panel of the VAZ 2107. It is best to proceed as follows - if it is established that the reason lies in a generator malfunction, then you can buy a new unit, and install on auto. After that, deal with malfunctions on the old device.

Faulty diode bridge and fuse

The fuse should be checked to make sure the fault is not the fuse. It is located on a VAZ 2107 under the hood near the relay. It is numbered F10.

As you can see, it is not difficult to eliminate breakdowns on the seven. The most important thing is to find the cause, armed with the necessary tools and devices. To do this, you do not need to visit a car service, and pay a lot of money to clean the oxidized battery terminals.