Horn problem
Thread Starter
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Elder User
Joined: Jun 2011
Posts: 940
Likes: 4
From: Illinois
no cruise control.
Seems like when truck gets hot it stops and when it cools down it works again. Not sure if anything else is going dead like lights cuz i really only drive it during the day.
Seems like when truck gets hot it stops and when it cools down it works again. Not sure if anything else is going dead like lights cuz i really only drive it during the day.
Hotshot
Joined: Apr 2009
Posts: 14,333
Likes: 247
From: Stanley, VA
The reason I asked is because on 78 & 79 models the horn wiring is different between with and without cruise.
On models without cruise, the horn button is an actual power switch, not just a ground circuit like earlier trucks.
Your truck does not have a relay and I can't really see anything in the cab that engine temps would affect.
I would check the horn wiring in the engine compartment and also I would clean and check the terminal connection on the horn(s).
If all of that checks out I would tear down the horns and clean up the contacts inside. They are actually pretty simple inside. I rebuilt mine and posted a thread on the process:
https://www.ford-trucks.com/forums/1...horn-work.html
On models without cruise, the horn button is an actual power switch, not just a ground circuit like earlier trucks.
Your truck does not have a relay and I can't really see anything in the cab that engine temps would affect.
I would check the horn wiring in the engine compartment and also I would clean and check the terminal connection on the horn(s).
If all of that checks out I would tear down the horns and clean up the contacts inside. They are actually pretty simple inside. I rebuilt mine and posted a thread on the process:
https://www.ford-trucks.com/forums/1...horn-work.html
Thread Starter
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Elder User
Joined: Jun 2011
Posts: 940
Likes: 4
From: Illinois
Still having intermittent horn problems. Waiting at a drive through yesterday and pulled away I needed horn and it didnt work.. drove for about 2 block and Viola it worked again. WTF?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
I suggest installing a jumper wire across the rag joint. I recall there is a thin copper bonding wire there that might be broken and working intermittently.
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Hotshot
Joined: Apr 2009
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From: Stanley, VA
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