Classic Mustangs (Tech) Technical discussions about the Mustangs of yester-year.

Horn unit hot to touch

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Old May 13, 2018 | 06:30 AM
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snafu7x7's Avatar
snafu7x7
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Default Horn unit hot to touch

Came out in the garage this morning and smelled that electrical burning smell, popped the hood and sniffed around, and moved my hand around until I identified the heat source. The left horn unit is too hot to touch, the right one is cool. I disconnected it immediately but is there possibly anything else going wrong or just a faulty unit. Yesterday when moving the car the horn came on when it bumped the threshold into the garage (just the vibration triggered it). Very odd.
Old May 13, 2018 | 11:28 AM
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does the horn that is left still work.

it also sounds like there is a problem with your horn ring. this is not uncommon. i would take it off and check out the pieces. the 3 prong plastic horn retainer sometimes gets a tab broken off which can cause the horn to go off over bumps etc.
Old May 14, 2018 | 06:29 AM
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Originally Posted by barnett468
does the horn that is left still work.

it also sounds like there is a problem with your horn ring. this is not uncommon. i would take it off and check out the pieces. the 3 prong plastic horn retainer sometimes gets a tab broken off which can cause the horn to go off over bumps etc.
Yeah the other one doesn't seem to work at all, I'm going to take your advice and replace the horn ring while replacing the horn unit
Old May 14, 2018 | 07:43 AM
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check the horn relay, could be an open circuit going to that horn...just building up heat.
Old May 14, 2018 | 09:52 AM
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Originally Posted by GT Nate
check the horn relay, could be an open circuit going to that horn...just building up heat.
an open circuit would not build up heat.
Old May 14, 2018 | 09:54 AM
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Originally Posted by snafu7x7
Yeah the other one doesn't seem to work at all, I'm going to take your advice and replace the horn ring while replacing the horn unit
i didn't say to replace anything. find the problem first. also, disconnect the battery when removing and installing the chrome horn ring.
Old May 21, 2018 | 04:03 PM
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Did you replace the steering wheel? On some wheels, you need to remove a piece of the horn internal ring. The horn in these is fed from the horn ring, it is not grounded by the horn ring. The horn goes to ground the power is fed from the ring.
Old May 21, 2018 | 05:01 PM
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Originally Posted by barnett468
an open circuit would not build up heat.
darn it you're right, my bad. Closed... something seems to be acting like a resistor.
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