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To do a quick check on the wiring set up a light bulb in a socket and attach it to the wires for the horn. It is possible one of the wires is damaged and if you check voltage it will show 12v but will not be able to carry any current. If the light does not work I usually start with a jumper wire from the ground side to another grounding point on the body or engine. If this makes the light work your problem is on the ground side. If that doesn't get it to light run a jumper from the batter to the positive side of the light and use the original ground. If it works now the problem is on the positive side.
Also sometimes an old fashion circuit tester with a real lightbulb in it can by used todo the same thing. Good Luck, Bernie
George Riggin Specialty Automotive
1993 900 Conv.
2002 9-5 4 Door
2003 9-3 Conv. Viggen appearance package
2008 9-3 SS 4 door
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