Faults in an electrical system are usually caused by simple causes such as a bad connection, a blown fuse, or a bad relay. Check these items first.
Voltage test
A lack of voltage on an electrical piece of equipment is most often caused by a bad connection. Check the section of the circuit between the battery and the electrical equipment for continuity with a voltmeter.
Finding a short circuit
To check for a short circuit, remove the fuse and connect a test light or voltmeter to the fuse connection terminals. There shouldn't be any tension.
Move the wire to be tested from side to side. If the light comes on, it means there is a short circuit. The same test can be carried out on any piece of electrical equipment, even a switch.
Checking the reliability of grounding
Disconnect the battery and connect one test light wire with a power source to "mass", and the second to the wire "masses" checked element. If the light comes on, then the ground is good.
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