Vehicle power devices Audi 100 C4, petrol

Battery designation
If the Audi-100 has a dust filter for the body ventilation system (from 8/92) or air conditioning, the battery is located in a waterproof casing (on the right...

How long do the reserves last?
How long a power consumer can operate using current from a battery can be calculated using the following formula: Operating time = battery capacity multiplied...

Electrolyte level control
The liquid in the battery consists of sulfuric acid diluted with distilled water. Some of this water may evaporate or disintegrate into hydrogen and oxygen...

Checking the battery charge
If the battery seems "powerless" despite the correct electrolyte level, you should check the degree of discharge. To do this, you need to find out the specific...

Charging the battery
Connecting the device to charge the battery For vehicles with a battery in the trunk: connect the positive cable to the positive battery terminal, and the...

Starting an engine with a dead battery
Cars with a catalytic converter rarely need to be towed or pushed. If the engine does not start only because the battery is dead, this is not dangerous. The...

Three phase alternating current generator
Power Depending on the year of production, engine and equipment, the Audi-100 was equipped with generators with a capacity of 70, 90, 100 and 120 A. To...

Battery charge indicator
The indicator in the instrument cluster is equipped with two positive terminals, namely one on the side of the D+ terminal of the generator (blue wire) and...

Voltage regulator
The generator in a car can be compared to a dynamo on a bicycle: the faster it rotates, the higher the voltage and, therefore, the current generated....

Do-it-yourself repair of the generator and regulator
Checking the charging voltage Usually the generator does not require repair, except for the really rare cases of replacing the generator brushes. More serious...

Driving with a faulty alternator
If the generator or voltage regulator does not work, you can still continue driving, since the battery can take over the role of the power source. During the...

Checking the condition of a V-belt or poly V-belt
TO No.12 To check the belt, turn the engine completely over several times. Only in this way can you really see all the surfaces of the belt. Often there is...

Tensioning V-belts and poly V-belts
TO No.13 A belt that is too tight can stretch, which damages its rubberized fabric. By applying moderate pressure with your thumb on the V-belt, you can push...

Tensioning a V-belt or poly V-belt
Models with 4-cylinder engines Alternator V-Belt Pre-August 91: Loosen clamp bolt on alternator adjuster bar. Turn the adjusting nut with toothed ring below...

Broken V-belt
4-cylinder engines While a poly V-belt should, strictly speaking, last the entire life of the vehicle, a V-belt can easily break. If the belt is broken, one of...

Engine overheating due to damage to the V-belt
If the V-belt of the power steering pump breaks on 4 - cylinder models, the water pump is also cut off and the engine overheats. This can cause irreparable...

Overview of V-belts and poly V-belts
The following table shows the dimensions of V-belts and poly V-belts for different versions of the Audi-100:

Replacing the V-belt (not poly-V-belt) of the generator
TO No.40 It has already been mentioned that the alternator V-belt must be replaced on a 4-cylinder engine built before August 91. However, the following also...

List of faults of the battery and generator

Starter — general information
When the ignition key is turned to the "Start" position, power is supplied to terminal 50 of the solenoid relay located on top of the starter. At the same...

List of starter faults
Not always our list of faults will be able to help you so much that the starter will finally be able to start the engine. But if your Audi-100 is equipped with...

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100(C4, 1990-1994)

100(C4, 1990-1994, petrol)

100(C3, 1982-1990)

100(C3, 1982-1990, petrol)

100(C3, 1982-1990, diesel)