Use a charged battery for testing.
1. Disconnect the ground wire from the battery terminal (–).
Attention! This erases all accumulated data in the electronic storage devices, such as the anti-theft code of the radio. Before disconnecting the battery, you should also read the recommendations given in subsection 13.1.7.
2. Install on ammeter (measuring range from 0–5 mA to 5 A) maximum measurement limits. Connect the ammeter between the negative pole of the battery and the wire connecting its pole to the car body.
Attention! The test can also be carried out using a test light. But if the bulb does not light up when it is turned on between the flexible jumper and the negative pole of the battery, then in any case you need to use an ammeter.
3. Disconnect all current consumers, disconnect the electronic clock from the terminals (permanent current consumer), close the doors.
4. By switching the ranges of the ammeter, determine the amount of current.
5. When removing the fuses, open the various electrical circuits in sequence. If zero is indicated in one of the broken circuits, this is where you need to look for the source of the malfunction. Defects can be correlated or dirty contacts, frayed through wires, internal short circuit in units.
6. If no defects are found in the electrical circuits protected by fuses, then the wire lugs should be pulled off the units that are not protected by fuses. These are: ignition system, alternator and starter.
7. If the indication returns to zero when disconnecting from the terminals of one of the unfused units, repair or replace the corresponding part. If a current leak is detected in the starter or in the ignition system, first check the ignition switch according to the electrical circuit diagram.
8. Connect the ground wire to the battery terminal (–).
9. Set the time and also enter the anti-theft code for the radio.