Use a charged battery to test.
Check with your hand the strength of the fastening of the positive battery cable, tighten the fastening of the wire if necessary.
Set the ammeter with a measurement range of 0-5 mA to 5 A to the highest measurement limit. Disconnect ground wire from battery.
Connect an ammeter between the negative pole of the battery and the ground wire. In this case, the positive pole of the ammeter must be connected to the ground wire, and the negative pole to the negative pole of the battery.
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.
Turn off all consumers of electricity, available hours (and other regular customers) disconnect, close the doors.
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, when one of the circuits opens, 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 circuits, the wires must be disconnected from the unfused unit. Such a unit can be a generator, starter, ignition system, instrument panel devices.
Connect ground wire (-) battery.
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