Horn
#1
Horn
1979 F-150 without speed control which means there's no horn relay on this truck. Horn does not work. Jumped horn to battery successfully so the horn itself is good. Traced wire that goes to the horn back to the wire harness, from there not sure where it goes. Inspected horn pad, all looks good. However, no power to either of the leads under the horn pad. Any suggestions on how to trace this out would be appreciated. Thanks all.
#2
1979 F-150 without speed control which means there's no horn relay on this truck. Horn does not work. Jumped horn to battery successfully so the horn itself is good. Traced wire that goes to the horn back to the wire harness, from there not sure where it goes. Inspected horn pad, all looks good. However, no power to either of the leads under the horn pad. Any suggestions on how to trace this out would be appreciated. Thanks all.
#4
I don't think there is one.
It's possible the horn brushes are worn down behind the steering wheel. Pull off the steering wheel to expose the turn signal switch, and short across the two brushes that are sticking out. If the horn works that way, then the brushes must be replaced because they're no longer making contact with the steering wheel rings. Unless these are made separately, you'll have to replace the turn signal switch, or improvise.
It's possible the horn brushes are worn down behind the steering wheel. Pull off the steering wheel to expose the turn signal switch, and short across the two brushes that are sticking out. If the horn works that way, then the brushes must be replaced because they're no longer making contact with the steering wheel rings. Unless these are made separately, you'll have to replace the turn signal switch, or improvise.
#7
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#8
I looked at the '79 wiring diagram. For a truck without speed control the circuit is actually pretty simple.
From the horn switch to the horn is a blue w/ yellow trace wire and from the switch to the power source is a yellow wire.
The sorta unusual part is the horn pulls it's power from the headlight switch
So you'll have a yellow wire from the headlight switch to the horn pad and a blue w/ yellow trace wire from the pad to the horn.
From the horn switch to the horn is a blue w/ yellow trace wire and from the switch to the power source is a yellow wire.
The sorta unusual part is the horn pulls it's power from the headlight switch
So you'll have a yellow wire from the headlight switch to the horn pad and a blue w/ yellow trace wire from the pad to the horn.
#11
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63Fairlane500
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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10-11-2003 11:53 PM