Steering wheel ground for horn
#1
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OK, I give up. I've been chasing a horn problem on our '79 SC for several days now. It seems to work only when it feels like doing so. I started with the relay, but there was no problem there. I then went to the steering wheel contact--both wiper and contact ring, but this didn't help either. Then I got the bright idea of checking for a constant ground at the steeing wheel, and that's where I found the problem. With one lead of an ohm meter connected to the wheel and the other lead connected to a good body ground, I can turn the steering wheel through an arc and see changes on the meter. The resistance can vary from 0 to infinite. I thought it would be an easy fix, but for the life of me I cannot find how the splined steering shaft to which the steering wheel is bolted gets its constant ground.. On old VW's and on the 356 series there was a carbon brush located on the steering column which contacted the steering shaft and made the necessary ground contact. Later VW's used a simple short grounding strap at the rubber coupling near the steering box if my memory serves me right. How did Porsche do it on the 911? I cannont find anything in my Porsche shop manuals about this.
#3
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Hi Kurt,
I never was able to resolve the horn ground issue. Having talked with numerous Porsche "gurus" here in Charlotte to no avail I finally just gave up. Shortly after posting this issue I sold the car...complete with an intermittent horn. Sorry I can't be of any help to you.
I never was able to resolve the horn ground issue. Having talked with numerous Porsche "gurus" here in Charlotte to no avail I finally just gave up. Shortly after posting this issue I sold the car...complete with an intermittent horn. Sorry I can't be of any help to you.
#4
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damn i have this EXACT issue to a T if i weave back and forth on the raod the horn cuts in and out and its not the contactor or the pickup ring. i am determined to find out how they did this.
#5
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As I said, I sold my '89 with this issue because I gave up. That's not how I normally respond to an issue, and I'm still ashamed of myself for doing so. Please post what you finally find to be the cause of this grounding problem. Although I no longer have the car, I'm still very interested.
#6
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As I said, I sold my '89 with this issue because I gave up. That's not how I normally respond to an issue, and I'm still ashamed of myself for doing so. Please post what you finally find to be the cause of this grounding problem. Although I no longer have the car, I'm still very interested.
http://forums.pelicanparts.com/porsc...sue-horns.html
im like you and hate not knowing what the route cause is.
#7
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Yup, an unresolved diagnosis is certainly nothing to be proud of. I'll check out the Pelican forum and I'll certainly look forward to your findings.
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#8
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looks like Pelican boys nailed it . and confirmed my findings ... only time meter readings are solid is when the steering lock is engaged and shaft is grounded.. its looking like a steering column grounding issue, they even have a fix.
#10
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Obviously not a permanent fix but proof of principle.
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