73-87 Chevy _ GMC Trucks > Electrical
Horn help!
petrified_peach:
Hey folks, I’ve got a ‘73 C10 and the horn stays on. The black wire to the button is in good shape, I’ve taken the steering column apart to where the black wire ends and it still stays on. Tested resistance from relay end to the horn end of the black wire, relay end to first copper switch, and relay end to second switch, all test fine. I replaced the steering column last year and I remember the horn doing this with that one too. I’ve tried a new relay, I’ve tried a new horn and a new relay, and I believe something is just blowing up my relays. The last new one I tried now tests about 18ohms. With relay in and horn disconnected, the relay is really warm to the touch. Everything is wired according to schematics (no horn fuse), and I am STUCK. My next step was to try a 4 pin relay with a ground, anything else I should keep an eye out for? Or a different opinion on why it’s blowing relays?
Thanks
bd:
Does the horn stop blowing with the relay unplugged? Unplug the horn relay. Use your ohmmeter to measure between the black horn button wire and ground. Post the results.
petrified_peach:
--- Quote from: bd on July 03, 2024, 10:50:08 AM ---Does the horn stop blowing with the relay unplugged? Unplug the horn relay. Use your ohmmeter to measure between the black horn button wire and ground. Post the results.
--- End quote ---
Do you mean the ground at the horn?
Mr Diesel:
Sounds like you need to trace wires and connections. Something is probably shorting/grounding somewhere, like a wire pinched. Also check your horn button. These things are pretty old now and I've seen some disintegrate to the point they either don't work at all (bad connections) or "work too good" (connections touching when they shouldn't).
I once reassembled my master cylinder and brake booster on a car and had a constant "brake" light illuminated on the dash. Bled the crap out of the system over and over thinking it was warning light for pressure imbalance. Turns out I had accidentally pinched that sensor wire between assembled parts and it was constantly grounded out.
Edit:
Definitely follow BDs suggestion first. He is trying to help you troubleshoot the wire issue one step at a time.
bd:
--- Quote from: petrified_peach on July 03, 2024, 10:55:05 AM ---
--- Quote from: bd on July 03, 2024, 10:50:08 AM ---Does the horn stop blowing with the relay unplugged? Unplug the horn relay. Use your ohmmeter to measure between the black horn button wire and ground. Post the results.
--- End quote ---
Do you mean the ground at the horn?
--- End quote ---
No. The black wire that runs up the steering column to the horn button (i.e., the horn switch at the center of the steering wheel). The symptoms imply that circuit is grounding. FYI - the relay will become warm if the horn sounds constantly. That in itself doesn't mean the relay is faulty.
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