Battery — design description The six elements in series are «heart» 12 volt car battery. Each cell consists of a combination of positive and negative plates, which, when immersed in an...
Starter — design description Audi A4 models are equipped with a so-called starter with forced engagement and self-deactivation of the gear. The starter is located in front of the engine,...
Generator and voltage regulator — design description A powerful three-phase synchronous generator is, as it were, the power plant of your car. Even when the engine is idling, it supplies current to all electrical...
Organization of the electrical network The Audi A4, as already mentioned in connection with the description of the engine management system, uses a modern bus system Controller Area Network (CAN)....
Electrolyte Density Check If, despite the correct electrolyte level, the battery does not deliver the required current, use a conventional densimeter with a pipette to check the density...
Measuring the resting voltage of a battery An accurate multimeter can be used to check the battery condition (reading accuracy±0.02 V). Based on the value of the quiescent voltage, one can judge the...
Battery load test In combination with the electrolyte density test, the load test of the battery provides an indication of the condition of the battery. This requires a battery...
Charging the battery The removed battery should be charged every month, because batteries that are not used for a long time will be discharged. This, of course, also applies to the...
Starting the engine from an external battery To connect a charged and a discharged battery to each other, use special wires to start the engine from an external battery, this will protect electronic parts...
Dismantling and installation of the generator In any work with the generator, you should follow the rules that are constantly found in different chapters of this book. After disconnecting the negative wire...
Checking the voltage regulator 1. Connect a multimeter between the positive terminal (red wire) generator and mass. 2. To warm up the generator to operating temperature (around 80°C), the...
Driving with a faulty alternator The movement can continue, despite the failure of the generator or voltage regulator. In this case, the power is supplied from the battery. Depending on the...
Dismantling and installation of the starter The starter may fail due to the failure of various parts. For example, it may be a jamming or severe wear of the traction relay or contact coals. The bearing...