Sequence of works
1. Remove the wire from the negative terminal of the battery, connect the multimeter wire between the negative pole of the battery and the "ground". If the device shows a current value exceeding 20 mA, there is a faulty consumer in the circuit. Before checking, make sure that all consumers are switched off.
2. Connect the wire to the negative terminal, open the fuse box and remove one fuse. Connect the tester wire to the fuse contacts. If the device does not show current, the circuit of this consumer is not damaged. A small current is acceptable. Devices such as a clock, radio or alarm constantly consume electricity from the battery. However, the current in their circuit is much lower than that of the faulty device.
3. Continue measuring on the fuse box until you find the device in whose circuit the high current flows. From the fuse table you can find out what devices are connected through it.
4. Disconnect the devices in this circuit one by one and measure the current each time. When the tester no longer shows current, the faulty device has been found.