✅ VAZ 2107 battery light is dim

A burning battery light on the VAZ instrument panel indicates that the battery is discharged or that the light bulb has a malfunction. If it lights up at the moment when the car refuses to start, it is necessary to look for the cause on the spot. If the indicator turns on while the engine is running, do not turn off the ignition immediately, try to get to a place where it will be convenient to remove and install the battery. There is a possibility that you will have to get a generator. The optimal stopping place would be a garage with a lift or pit.

There may be several reasons why the battery on a VAZ is discharged, why the light on a VAZ 2107 is on. Let's look at them, as well as ways to solve problems.

The battery charging light is on

When you start the engine, many different lights come on on the dashboard, one of them is the battery charging light.
Ideally, it lights up as soon as you start the engine and goes out after a while. This indicates that the generator and all its circuits are fully operational and the battery receives a charge of 13.7-14.3 Volts, that is, it is charging. However, various breakdowns often occur due to which the light bulb continues to glow, glows dimly, or does not light at all. To deal with such malfunctions, you need to understand a little about the design of the generator and the principle of its interaction with the battery.

A little theory

On our website Vodi.su we have already described in detail the design of a car generator. Let's just say that electricity is generated in it by the rotation of the crankshaft. As the speed increases, the voltage also increases, but it must be within the limits indicated above, otherwise the battery will be overcharged, which threatens the electrolyte boiling and sulfation of the plates.

To prevent this from happening, a relay regulator is installed in the rotor excitation circuit, thanks to which a stable voltage is supplied to the battery.

The signal from the generator to the warning lamp is transmitted through a fuse, which is also located in the generator itself. Accordingly, the light stays on until the generator starts working and transmits voltage to the battery.

The charge from the generator passes through:

diode;
regulator;
generator brush;
slip rings;
winding and wiring.

Thus, if at least one of these elements does not work correctly or fails, the readings of the light bulb cannot be trusted, although charging may be supplied to the battery.

Why is the battery charging light on?

There can be a lot of reasons. So, if after starting the engine the warning light continues to burn at full intensity, most likely the alternator belt has stretched and needs to be replaced. At the same time, you can hear characteristic sounds from the engine. On Vodi.su we have also already told you how to tighten or change a belt.

The second common cause is poor contact at the battery terminals or at the terminals from the generator. Contacts oxidize over time and need to be cleaned.

Failures in the mechanical part of the rotor: the bearing fell apart, the bushings flew off. You will have to completely remove the generator, disassemble it and replace broken parts. Fortunately, you can always find a repair kit of three bushings for a VAZ-2107 or other domestic cars on sale.

Failure of the diode bridge, relay regulator. In this case, you need to check them with a multimeter, or contact a specialist. Repairs often cost more than purchasing a new generator.

Over time, graphite brushes also wear out and need to be replaced regularly. When they are worn out, the charge is not transferred to the winding, and accordingly the light bulb begins to glow dimly, although the charge is transferred, but very weakly. Use a voltmeter as a guide. If the brushes are not changed in time, the battery will constantly be undercharged, which can lead to gradual shedding of the plates.

Generator diagnostics

First of all, the voltage is measured at the battery terminals. If it is lower than required, you need to check the entire circuit step by step:

belt tension level;
measure the voltage at each of the generator terminals - at each terminal it should be half as low as at the battery;
check fuses, relays, diodes;
check the resistance in the dashboard, the quality of soldering of wires.

If it turns out that the breakdown lies in the generator itself, it will have to be removed and also checked. In particular, they first check the relay regulator, then measure the resistance of the rotor field winding using an ohmmeter. It should not be lower than 4.5 ohms. Also, using the tester, you can determine whether the winding circuit is open.

It is clear that such malfunctions cannot be avoided. However, there are simple tips to help extend the life of the generator:

first of all, regularly check the quality of its fastening - constant vibrations lead to mechanical damage;
Clean external surfaces from time to time;
check the belt tension, tighten if necessary;
quality of the rotor bearing - remove the belt and spin the rotor, it should rotate smoothly, without play or clicks.

You also need to monitor the quality of the connection of the wires to the generator and voltage regulator.

Thus, a lit battery charging light while the engine is running is a serious reason to make a diagnosis. Please note that it can also light up if you have installed a lot of additional equipment - subwoofers, lights, lights.

Loose or damaged alternator belt

During diagnostics, it is imperative to check the condition of the alternator belt. Sometimes it happens that due to its long-term operation or under the influence of other factors, it becomes deformed, as a result of which the generator drive misfires. Pay attention to the belt tension. Its weakening leads to the same effect.

If the belt is not deformed and has no visible damage, it can simply be tightened. Otherwise, it must be replaced. The normal belt tension is such that it can be rotated around the horizontal axis by 85-90 degrees.

The battery charging light is on

However, various breakdowns often occur due to which the light bulb continues to glow, glows dimly, or does not light at all. To deal with such malfunctions, you need to understand a little about the design of the generator and the principle of its interaction with the battery.

A little theory

A little theory

During operation, a dead battery is charged with a constant voltage of 13.6-14.2 V in the vehicle's on-board network. For proper operation of the car and its systems, this voltage is maintained by the battery itself until the generator rotor begins to rotate at a frequency of 800-900 rpm. Then it produces electricity sufficient for normal operation of the car and charging the battery. Under different engine operating modes, when the engine crankshaft speed changes, the generator rotor speed also changes, which leads to an increase in the voltage at the generator output. To maintain a voltage of 13.6-14.2 V in the on-board network, a voltage relay-regulator (RR) is included in the generator excitation circuit, which, when the network voltage increases above the rated voltage, reduces the current going to the generator excitation winding. The magnetization of the rotor poles decreases, which leads to a decrease in its output voltage.

The reasons that the generator does not charge the battery are related to the elements of the excitation circuit or the output voltage circuit from the generator to the battery, including parts of the generator.

When the ignition is turned on, the lock also turns on the ignition relay. In this case, +12 V passes through the relay contacts and fuse No. 10 of the mounting block, then is supplied to the on-board network and to the output of the battery charge indicator lamp and the charging sensor. Then they go through the diode, the mounting block (plugs Ш5-Ш10), and are fed to plug “61” of the generator 37.3701, which have been installed on the VAZ 2107 since 1988. Next, +12 V goes to the terminal of the built-in PP and through the brush and slip ring to the winding excitation - the starting excitation of the generator is performed. As the engine speed increases, and with it the generator rotor, the phase voltage increases, and through a block of additional diodes it increases the voltage on the excitation winding and on the output diode of the battery charging indicator light. When the output phase voltage reaches +12 V at both terminals of the battery lamp, the voltage is equalized, and due to the absence of a voltage difference, it goes out. In this case, the VAZ 2107 generator produces a voltage of more than 12 V, which charges the battery.

The electrical circuit diagram of the VAZ 2107 car injector differs from the circuit diagram of the VAZ 2107 carburetor only in the presence of a piece of equipment that controls the power system, and does not affect the battery charge. Quite the contrary - malfunctions in the battery charging system can affect the operation of the injection engine ECU.

Powerful electricity consumers are controlled using electromagnetic relays connected to the network. Let's look at ways to troubleshoot battery charging problems for both injection and carburetor engines.

On a VAZ 2107 the battery charging lamp is on, but there is charging: reasons and what to do

The car dashboard contains not only analog gauges, but also various indicators. One of the main indicators is a battery icon, 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 a VAZ 2107 lights up after starting the engine, this indicates a malfunction of the generator. If the generator is working properly, and the battery is charging, and the lamp is on, then the reasons for the indicator light need to be looked for.

Diode bridge

The diode bridge is used to convert alternating voltage to direct voltage. If at least one of the diodes breaks down, the device stops coping with its tasks, which is why a voltage that does not correspond to its parameters begins to flow into the on-board circuit of the machine. That is why the rectifying bridge must be checked in the case when the battery charging light is on, but there is charging (VAZ 2107, 2106).

You can also determine the health of the diodes using a multimeter in the appropriate mode. Turn on the tester and connect the red probe to the positive terminal of the bridge, and the black probe to one of the contacts marked “AC”. The threshold (pass) voltage for silicon diodes ranges from 400 to 1000 mV. If the device shows you a value that does not fit within the specified range, the bridge must be replaced. It is impossible to repair it.

Reasons for the battery charging light to glow

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 continues to light on the instrument panel of the VAZ 2107, then the owner’s first opinion is that the generator is faulty. This is a 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 instrument panel are:

Weakening of the tension of the generator belt, as well as its wear and damage.
The fuse link burns out.
Malfunction of the relay regulator or rectifier (diode) bridge.
A break occurs in the generator winding.
Poor contact at the battery terminals.
Abrasion of graphite brushes on the generator.
Lack of ground contact.

You cannot operate a vehicle with a glowing battery indicator on the instrument panel. At any moment, the battery can be discharged, since it is not receiving charge from the generator, and the car will simply stall. How long a vehicle can drive with a faulty generator depends on the quality of the battery, its charge and the vehicle’s electricity consumption. Typically this period of time ranges from 10 minutes to 2 hours.

What can a 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, but there is charging, the reasons are also hidden in the malfunction of the generator. The car battery has an operating voltage of 12V, and to charge it requires 13.5 to 14.4V. In this case, the battery will be charged, and the lamp on the parting panel will not light up when the engine is running. If the indicator lights up after starting the engine, then there is a high probability that the generator is delivering insufficient voltage to the battery (that is, below 13.5V). If, when measuring the voltage at the battery terminals with the device while the engine is 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.

Malfunctions in the timing belt

The belt may be torn, stretched, or simply wet.

Timing belt drive

A belt that is torn or shows signs of physical wear must be replaced.
Loose, without signs of wear - tighten it. A correctly tensioned belt should not bend by more than 1.5 cm when pressed.

Important! Excessive timing belt tension will damage the generator bearings, which will require time-consuming and expensive repairs. The deflection should be 1-1.5 cm.

If there is moisture, dry it.

Why does the VAZ 2106 – 2107 battery charging light not light up?

Often owners of VAZ 2106 - 2107 wonder why the battery indicator light does not light up when the ignition is turned on . This is a fairly common problem on classic. And almost everyone has encountered such a manifestation of a malfunction in the car’s energy system.

And it’s one thing if such a malfunction occurs in the summer and 100 meters from the house. Such a breakdown is much more dangerous in cold weather on a country road, especially at night. Therefore, you need to know the causes of the problem, as well as how to fix it. There are several reasons for a light bulb to fail. You'll have to check all the options, fortunately it's not difficult. Basic electrical knowledge is sufficient.

Burnt out battery indicator light

A fairly common cause of this problem is lamp failure. This is perhaps one of the simplest breakdowns, but it is not always harmless. It is advisable to replace the light bulb as quickly as possible. If there are problems with it, you will not be able to identify the problem with the generator in a timely manner. Which will lead to the battery being discharged at the most inopportune time. Thus, driving with a burnt-out lamp is highly not recommended.

Battery charge indicator light VAZ

You should also consider the design features of your car. Most generators have a built-in resistance. This allows you to generate energy even when the charge control lamp is burnt out. On some cars, the lamp itself plays the role of resistance.

This can be found on some modifications of the VAZ 2112, as well as many old foreign cars. In this case, when the light bulb burns out, the generator stops producing current. If your car has this structure, you should always have a spare lamp.

Low battery

Another common reason why the battery warning light does not light up when the ignition is turned on in a VAZ 2106 - 2107 is a weak battery.

If, at the same time that the battery light does not light up, the dashboard instruments do not turn on or are dimly lit, then this is a clear sign of a low battery. The problem can be “cured” by simply charging the battery.

Good battery

However, not all so simple. The discharge of a car battery may not occur because the owner did not have time to charge it in time or forgot to turn off the headlights. A problem with a battery becomes dangerous if the cause lies in the generating device. As you know, the battery must be charged while the car is moving, otherwise it will discharge quite quickly. And this function falls on the generator. But if the latter is faulty, then problems arise.

Thus, a seemingly trivial reason may indicate a damaged car generator, which performs many useful functions. Obviously, a thorough diagnosis should be carried out, the cause should be found and eliminated.

Some useful tips

To avoid problems associated with a faulty battery charging circuit, use the following tips.

Pay more attention to your car's dashboard. This way you will know not only about the charging status of the battery, but also about the operation of other systems and mechanisms.
Check the alternator belt regularly. The correct operation of the entire on-board network when the engine is running depends on its condition and tension. If you find the slightest defect in the belt, do not delay replacing it.
Don’t be lazy at least once a month to check the voltage supplied by the generator to the battery terminals. If any discrepancies with the recommended values are detected, perform a full diagnostic of the on-board network.
Periodically conduct a visual inspection of the condition of the battery terminals and generator terminals. Having discovered their oxidation, clean them with fine sandpaper and treat them with a liquid like VD-40.
Do not allow water to get on the generator, battery and relay regulator. It can cause a short circuit in the electrical circuit. It is better to entrust engine washing to specialists.
When repairing the battery charging circuit, avoid using spare parts that raise doubts about their quality.

Blown fuse

A failed dashboard light may be caused by a blown fuse. In this case, several devices usually fail at once. If such a symptom appears, you just need to check the fuse. It is located in the mounting block.

Mounting fuse block VAZ 2107

You can find it using the diagram on the block cover. To check, the fuse is removed from the mounting block. The easiest way is to install a known good fuse. If this is the reason, then the light should light up when the ignition is turned on. You can also check the fuse by measuring the resistance with a multimeter.

What else to check

Voltage regulator;
Generator rectifier unit;
Diodes;
Generator for broken windings;
Generator brush assembly;
Contacts on the terminals of the generator, mounting block.

A malfunction of any of these elements leads to the fact that the charging system is inoperative and the VAZ 2107 battery is not charged.

Let's continue... Diodes are checked with a test light or multimeter. If one of them is broken, the entire rectifier will have to be replaced.

A light bulb may burn out due to a faulty electrical circuit.

A problem with the circuit that powers the battery light can be caused by several things. Let's consider everything.

So, problems with contacts are becoming quite common. Usually this situation occurs in the spring, after cold weather. During the winter months, moisture accumulates on the connectors, causing the formation of oxides. This makes the contact much worse, as a result of which the indicator stops turning on.

Electrical circuit diagram of VAZ 2107

As a rule, this problem does not appear immediately and is not stable. In other words, the light bulb may light up one time and not another time. The solution to this problem is to clean all connectors. They should be treated with a grease specifically designed for this purpose.

The light bulb may burn out due to an open circuit. To make sure of this, you should arm yourself with a multimeter. The device checks the circuit to determine the faulty section.

Fuse relay is faulty

Another possible problem is a faulty relay. Some car modifications are equipped with a relay that monitors the battery charge light on the instrument panel. As soon as the relay fails, the indicator does not work either.

Fuse relay VAZ 2107

To test the relay, you should arm yourself with a multimeter. They measure the current at the positive output of the relay. If the voltage is less than 6V, then there is clearly a problem with the generating device. If the value is even higher, then the relay is faulty. It needs replacing.

Thus, finding out the reason why the battery light does not light is extremely important for adjusting the indicator and protecting the car from more serious malfunctions.

Diagnostics

The search for a faulty element begins with checking the battery charge level. To measure the voltage at the terminals, use a multimeter or voltmeter. It is necessary to take readings in two modes:

without load with the ignition turned off and the minus terminal removed;
under load: by turning the key in the ignition and turning on any consumer (low beam headlights, air conditioning).

The multimeter probes in voltmeter mode are connected in series: the positive terminal is a red contact, the negative terminal is a black one. The normal value of the battery voltage at rest with a 100% charge is 12.05 - 12.6 Volts.

Important!

The battery voltage directly depends on the state of charge: if the level is reduced to 10%, then the maximum voltage without load at the terminals will be about 11.3 Volts.

The test under load should be carried out carefully, observing safety precautions: when turning on the ignition, do not touch the power terminal and cable with your bare hands. The multimeter readings are taken twice: when the engine starts, and after 20-30 seconds. When starting the engine, the power current can reach a peak of up to 670 Amps, depending on the power of the unit. The battery supplies a significant part of the energy to the starter for the initial crankshaft rotation - at this moment the voltage at the terminals drops. A value of 8-9 V is considered normal; if the drop during startup is critical and reaches 6 V, then the battery is completely faulty.

Checking fuses of VAZ 2106 - 2107 with a multimeter

You also need to know how to check a fuse in a car with a multimeter because in some cases replacing it does not eliminate the malfunction; the circuit needs a more thorough check. Usually its failure is visible to the naked eye, but in some cases the break can be detected only after an instrumental check. To do this, use a car tester or even a simple voltmeter to measure direct current.

We attach the probes to the fuse.
Next, using simple manipulations, we melt the wiring inside the fuse. Therefore, we made a non-working fuse out of a working fuse. What won’t you do for a good article!? :-). Again we apply the probes to the fuse and look at the behavior of the multimeter.
The resistance is infinitely large, we do not hear any sound signal like “peep”. The fuse is broken. It can be thrown into the trash bin.

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 rupture by adjusting the degree of tension or resort to replacing it;
in order to clean oxidized terminals, it is enough to clean them using fine-grained sandpaper;
in the event that the battery is discharged as a result of prolonged operation of electrical appliances with the engine turned off, it is enough to recharge it;
If there are various internal damages, you should contact a specialist.

Faults such as failed “brushes” and generator wires, as well as broken windings or broken relays cannot be eliminated by repair. In this case, it is advisable to replace the spare part.

conclusions

By carefully monitoring the dashboard readings, you will be able to independently identify problems in the operation of your vehicle at first and avoid serious consequences. We also draw your attention to the fact that you can always order the parts you need from our company. We offer competitive prices and will help you save not only money, but also time, because you will 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.

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