Use a charged battery for testing.
Turn off all consumers of electricity, available hours (and other regular customers) disconnect, close the doors and the hood of the engine compartment. Turn off the rear door switch.
Disconnect ground wire from battery (-).
Attention: This erases the contents of electronic memory devices, such as engine trouble codes. Before disconnecting the battery, you must also read the instructions in chapter "Removing and installing the battery".
Set the ammeter with a measurement range of 0-5 mA to 5 A to the highest measurement limit. Connect an ammeter between the negative pole of the battery and the ground wire.
Attention: The test can also be carried out using a test lamp. If the lamp connected between the ground wire and the negative pole of the battery does not light up, then in this case it is necessary to use an ammeter.
Reduce the measuring range of the ammeter until you can read the reading from the scale of the device (allowable value 1-3 mA).
By removing fuses in series, open various electrical circuits. If, with an open circuit, the ammeter needle deviates to zero, then the fault should be sought in this particular circuit. A malfunction can be caused by corrosion and contamination of contacts, chafing of wires, internal short circuit in the unit.
If no fault is found in the fused electrical circuit, disconnect the wires from the unfused unit or system. Such a unit or system can be a generator, starter, ignition system.
If, when a unit or system that does not have a fuse is turned off, the ammeter needle deviates to zero, then the corresponding unit must be repaired or replaced. In the event of power loss in the starter or ignition system, always check the ignition lock as well in accordance with the wiring diagram.
Connect ground wire (-) battery. Set clock. Tune the radio to transmitting radio stations.