Vehicle power devices Audi A4 B5, petrol

Correctly selected battery
The battery is the main link of the on-board electrics in the Audi A4. Various consumers receive power from it - it receives recharging from the generator. The...

How long does the battery reserve last?
We calculate how long an electrical consumer can operate from the battery using the formula: service life = battery capacity x on-board network voltage divided...

Checking the acid level in the battery
The liquid in the battery consists of sulfuric acid diluted with distilled water. Some of this water may evaporate or break down into hydrogen and oxygen while...

Checking the battery charge
If, despite the required acid level, the battery shows no signs of life, then you should check its charge status. Information about this can be obtained based...

Charging the battery
Connecting a home charger 1. Connect the positive wire of the charger to the positive terminal of the battery, and the negative wire to the negative terminal...

Starting an engine with a dead battery
If the engine does not start because the battery is discharged, this is not dangerous. The situation is different if there is a malfunction in the ignition...

Alternating current generator
Since the Audi cannot pull a wire to supply current, the current must be produced directly in the car. This task is performed by the generator. But not only...

Charging indicator light
The indicator light in the combination instrument has two positive connections: first, on the D+ terminal of the generator (blue wire) and secondly, on...

Self-help with generator and voltage regulator
The generator in a car can be compared to a bicycle generator: the faster the generator rotates, the higher the voltage rises and, consequently, the supplied...

Driving with a faulty generator
If the generator or voltage regulator does not work, you can continue driving because the battery can help start the engine. During daylight hours, the battery...

V-belt and poly-V-belt
With a six-cylinder engine, all auxiliary units operate from a wide drive belt - a poly V-belt. Thanks to an automatic tensioner roller, this belt should last...

Checking the condition of the V-belt and poly V-belt
The photo shows the tensioner of the poly V-belt for the generator, servo pump and viscous fan: 1 - protrusion for installing an open-end wrench; 2 and 3 -...

Replacing V-belts and poly-V-belts
Belt drive assemblies on a four-cylinder engine with the front of the vehicle removed 1 - air conditioning compressor; 2 - tension roller; 3 - crankshaft belt...

Broken V-belt
1 - the passage of the poly V-belt in a six-cylinder engine without air conditioning. 2 - this is how the poly V-belt in a six-cylinder engine with air...

Overview: V-belt and poly V-belt
The table below shows the dimensions of V-belts and poly V-belts for various Audi A4 models: Model V-belt or poly V-belt (KRR) for Designation Four-cylinder...

Help with battery and generator problems
Malfunction Its reasons Your help A. The red charging indicator light does not light when ignition on 1. The battery is dead 2. The battery cable is broken,...

Starter — location and operation
The starter is located on the right side of the engine (shown here in a four-cylinder engine) 1 - terminal 50 wire (from the ignition switch); 2 - terminal 30...

Removal the starter
Dismantled starter (5) 1 - electromagnetic switch; 2 - terminal 30 wire (from battery); 3 - terminal 50 wire (from the ignition switch); 4 - starter drive...

Help with starter problems
Our help in case of malfunctions may not always be so effective that the starter will finally start the engine. But if the Audi has a manual transmission, you...

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A4(B8, 2007-2015)

A4(B7, 2004-2008)

A4(B6, 2000-2006)

A4(B6, 2000-2006, petrol)

A4(B5, 1994-2001)

A4(B5, 1994-2001, petrol)