Continuity would test each run of wire or electrical connector. Touch a probe to each end of the wire and a tone will sound if the wire is connected from one end to the other. No tone, the wire is broken somewhere between the two points that you tested. The multi-meter is trying to complete the circuit with that wire.
You can test each leg of the switch for continuity too. With the switch in the on position, you should get tone across the terminals if the switch is good.
Test any fuses and fuse panels in the same way.
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