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In theory you would simply pick up the wire at a known point such as on the horn itself. Then you would follow the wire to where ever it goes keeping an eye out for breaks in the wire, insulation failure or such. You would also check all plug connections to be sure they are tight and not corroded. That is much easier to say then to do. You would also check out any devices along the way. For example there is a horn relay in something called the "convenience center" There you would check the horn relay to see if it works, also verify that the connections are tight and not corroded. There you should also find a wire from the fuse block supplying 12 volts to power the horns as well as the relay itself. If it doesn't have 12 volts then you would check at the fuse block to see if the fuse is blown. It is the courtesy light fuse, should be hot all the time. Last at the "convenience center" is the wire from the horn blow switch in the steering wheel. It should be "open" unless the horn button is pushed, then it should be ground. And at the very last point, the horn blow switch in the steering wheel should be checked. There the wire from the "convenience center" should be grounded when the horn is pushed. If the switch is defective then it won't ground the wire. When the wire is grounded it activates the horn relay causing the horn to sound.

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โˆ™ 2010-05-25 22:56:36
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Q: How do you check the wiring on the horn of a 1988 Celebrity?
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