Use a charged battery to test.
1. Disconnect the ground cable from the battery.
Attention! This erases the data from the engine fault memory or the radio's security code. Before disconnecting the battery, read the instructions in Section Removing and installing the battery.
2. Install on the ammeter (with measurement limits 0-5 mA and 0-5 A) the highest measurement limit. Connect an ammeter between the negative pole of the battery and the ground cable.
Attention! The check can be carried out using the indicator. If the indicator lamp between the ground cable and the negative pole of the battery does not light up, you should in any case use an ammeter.
3. Turn off all consumers of electricity, close the doors.
4. Switch the limits of the ammeter until readings appear (1-3 mA is acceptable).
5. By removing the fuses one by one, open the various current circuits. If, when one of the circuits opens, the readings drop to 0, the source of the malfunction should be looked for here. Possible errors: corroded and dirty contacts, frayed wires, internal circuit in the units.
6. If no fault is found in the fuse-protected circuits, disconnect the wires of the units that are not protected by fuses: generator, starter, ignition system.
7. If the reading drops to 0 when one of the unprotected circuits is turned off, repair or replace the corresponding element. If there is a loss of current in the starter or ignition system, always check the ignition and starter switch according to the diagram.
8. Connect the mass cable to the battery.
9. If available, set the clock and set the radio's security code.