33. Switch the ammeter with a measurement range from 0-5 mA to 5 A to the upper range.
34. Disconnect the wire from the battery «masses» (-), before turning off the ignition.
Attention! If the radio has an access code, then when the battery is disconnected, this code is deleted. Once the battery has been connected, the radio can only be switched on by entering the appropriate code or by using the services of an AUDI workshop or the radio manufacturer. Therefore, before disconnecting the battery, check and write down the entered code.
35. Connect positive (+) ammeter lead to wire terminal «masses» (-), taken from the negative pole of the battery, and the negative (-) the output of the ammeter is to the negative pole of the battery.
Attention! When checking the battery on vehicles with a diesel engine, remove the glow plug fuse (preheat), so as not to damage the ammeter by high current.
Attention! You can also check with a test light. But if the light bulb connected to the ground terminal and the negative pole of the battery does not light up, then in any case you need to use an ammeter.
3S. Turn off all current consumers, turn off clocks and other permanent consumers of electricity, close the doors.
37. Switch the ammeter to smaller measuring ranges until the ammeter reading can be read (1-3mA are allowed).
38. Interrupt various electrical circuits by removing one fuse after another. If, when a circuit is disconnected, the ammeter readings drop to zero, the fault should be sought in this circuit. Its sources can be corroded or dirty contacts, frayed wires, internal short circuit of the circuit.
If no fault is found in fused circuits, disconnect wires from non-fused devices such as alternator and starter.
If, when disconnected from the terminals of any of the units that are not protected by fuses, the readings of the device drop to zero, then sort or replace the corresponding device. In case of current losses in the starter circuit or in the ignition system, it is imperative to check both the ignition and starter switches according to the diagram.
39. Connect the mass wire terminal to the battery (-).
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