Stages of work
Disconnect the negative battery cable, connect the multimeter cable between the negative pole and the battery cable. If the device shows current, assume that some consumer is faulty.
Connect the ground wire, open the fuse box and remove the fuse. Connect a multimeter to the contacts. If the current does not flow, the electrical circuit is OK. A weak current is also not an alarm signal. Devices such as on-board computers, clocks, radios and signaling equipment are always under battery voltage. They consume much less electricity than one faulty consumer of current.
Repeat the measurements in the fuse box until the multimeter shows a higher current. Fuse Table will show you which consumers belong to a given electrical circuit.
Disconnect all the fuses one by one and measure the current each time. When the multimeter shows no current, you have identified the hidden consumer of electricity.
(This publication was borrowed from the website: «fordbook»)