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Location: Chapel Hill, NC
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Random horn blowing

Hello. I'm having a problem with the horn on my '69 912. It sounds randomly without my input. I can't make it happen although it seems to occur after a sharp turn and almost always while I'm in motion. The steering wheel is a Moto Lita with a flush horn button. The button isn't depressing on its own--the spring has good resistance. My guess is a faulty horn contact pin. Am I on the right track? Thank you.
Old 03-08-2016, 01:46 PM
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ROW '78 911 Targa
 
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Check the wire to the contact isn't abraded (insulation worn) and making contact to ground.
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Old 03-08-2016, 02:00 PM
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look at the wires and clean the connectors..
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Old 03-08-2016, 03:32 PM
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Check the steering wheel. That's the issue. Either a bent or dirty contact will do this.
Old 03-08-2016, 03:42 PM
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Sounds like a wire that needs insulating.
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Old 03-08-2016, 05:23 PM
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There's a rubber donut of the back of the horn butterfly. When it gets hard/brittle the horn will blow intermittently
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Old 03-08-2016, 06:59 PM
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I know how that feels - mine went off on a permanent blare in dense LA stopped traffic on the 405. Can you imagine the looks I was drawing as I was frantically trying to get over from the fifth lane to the side to pull the relay. OMG.
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Old 03-08-2016, 07:50 PM
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My 914 did the same thing. It would randomly honk as I hit bumps or turned. It decided to start blaring right after I pulled up behind two tough looking Harley riders.
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Old 03-09-2016, 05:44 AM
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Hi again. I looked everything over and couldn't find anything obvious. I took took the car out yesterday and the horn started blowing again, now very frequently. I was able to pull out the horn button and remove the single wire from the connector. The wire was not grounded on anything, yet the horn was still blowing. So somehow, the horn circuit is energized and grounded without the horn button. Does this sound like a bad relay?
Old 03-13-2016, 07:59 AM
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Your car has a case of automotive Tourette's syndrome.
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Old 03-14-2016, 05:00 PM
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ROW '78 911 Targa
 
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In/ below/behind the fuse panel area, there is a single connector for the brown/white wires from the dash wiring to the relay wire, maybe the problem is there.
Also check the wiring from the 6 pin connector to the steering column.
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Dennis
Euro 1978 SC Targa, SSI's, Dansk 2/1, Bitz kit EFI.
Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds.
Old 03-14-2016, 07:49 PM
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