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I do the most of my wire trouble shooting and installation with a continuity tester (with a loud buzz), a 20' length of wire with 2 alligator clips, and a cheapo probe that has an light that goes on with the pointer hitting positive and the clip end attached to the battery negative. You can determine if switches or fuses are good or bad with the continuity tester. That little pointer end can really get to places without moving wire ends. That long run of wire with the alligator clips really comes in handy checking wires and the such. I found that poorly crimped terminal ends are a culprit that gets "overlooked" at times. You blame the wire but it is the connector.
Garris