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Old 06-08-2018, 04:49 PM
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You have to remember that most of the wiring flows through harnesses. There is always the potential for a wire to get a brittle covering and become exposed or for a wire to rub off the covering. Another possibility is that a previous owner made a modification. My experience chasing out these problems requires three things: 1) Patience; 2) multi-meter; 3) The Electrical Wiring Book. Turn to the page for the horn circuit. See how it operates (e.g., does the horn button drop the circuit to ground to complete it or does it supply "+" to the horn. Notice the numbering on the wires in the book and use that to see what colors they are. Now start chasing wires with the multi meter looking for voltage (is it there when it should be and not there when it shouldn't be). Use the resistance setting to determine if wires have continuity (is the wire good or is there a break in it). Unplug things at junctions, fuse box, circuit breakers, etc and see if you get the expected results.

Good Luck
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