Horn Problem, Horn doesn't work |
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Horn Problem, Horn doesn't work |
capitolatim |
May 21 2017, 05:53 PM
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#1
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Member Group: Members Posts: 64 Joined: 11-June 15 From: capitola,ca Member No.: 18,841 Region Association: Northern California |
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914Sixer |
May 21 2017, 06:20 PM
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#2
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914 Guru Group: Members Posts: 8,870 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Bad horn.
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capitolatim |
May 21 2017, 06:36 PM
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#3
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Member Group: Members Posts: 64 Joined: 11-June 15 From: capitola,ca Member No.: 18,841 Region Association: Northern California |
No horn tests good, and the new horn didn't work.
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Rand |
May 21 2017, 06:39 PM
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#4
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Cross Member Group: Members Posts: 7,409 Joined: 8-February 05 From: OR Member No.: 3,573 Region Association: None |
He said horn tests good on battery. Has to be wiring. That sounds too obvious, I know. Sorry.
This is where my first 10-second shot would be running jumpers from the hot wire and ground point in the column to a horn on the side and see if it works differently. Process of elimination, then wire tracing. |
oakdalecurtis |
May 21 2017, 08:15 PM
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#5
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Oakdalecurtis Group: Members Posts: 1,323 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California |
I would be concerned that in your picture, the wire from your horn relay to your horn button is red. On my car and on the Pelican wiring diagram, the wire from the horn button, H, to the horn relay, J4, is shown as brown with a white stripe . What color is the wire at pin 85 on your horn relay, should be brown with white stripe? If it's the same red as at your wheel, check it's continuity to the horn button. If that wire is correct, then check continuity on the black wire with yellow stripe that goes from the pin 87 on the horn relay to power the horn. The brown wire on the horn itself is ground.
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r_towle |
May 21 2017, 09:50 PM
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#6
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Custom Member Group: Members Posts: 24,563 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
I believe its a grounding issue behind he wheel.
Take it off and take a look at the contact that the red wire is using on the metal ring on the back side of that wheel hub. That is how it gets its ground, so it needs to be a great connection, and super clean. its two rings, one wire from below (brown/white) to the lower ring, and your red lead is connected to the upper ring. rich |
porschetub |
May 21 2017, 10:49 PM
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#7
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Advanced Member Group: Members Posts: 4,697 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
I believe its a grounding issue behind he wheel. Take it off and take a look at the contact that the red wire is using on the metal ring on the back side of that wheel hub. That is how it gets its ground, so it needs to be a great connection, and super clean. its two rings, one wire from below (brown/white) to the lower ring, and your red lead is connected to the upper ring. rich (IMG:style_emoticons/default/agree.gif) appears to be a short there,maybe the contact ring isn't right,but we don't know if its a stock one or Lecarra one depends on the boss used of course. Just fitted momo adaptor and other aftermarket wheel,touch the horn wire to the wheel and all is load and clear. |
capitolatim |
May 22 2017, 09:04 AM
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#8
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Member Group: Members Posts: 64 Joined: 11-June 15 From: capitola,ca Member No.: 18,841 Region Association: Northern California |
I would be concerned that in your picture, the wire from your horn relay to your horn button is red. On my car and on the Pelican wiring diagram, the wire from the horn button, H, to the horn relay, J4, is shown as brown with a white stripe . What color is the wire at pin 85 on your horn relay, should be brown with white stripe? If it's the same red as at your wheel, check it's continuity to the horn button. If that wire is correct, then check continuity on the black wire with yellow stripe that goes from the pin 87 on the horn relay to power the horn. The brown wire on the horn itself is ground. Thanks for reply, I don't think 1970's have a relay. Here's a photo of the contact ring. Attached thumbnail(s) |
capitolatim |
May 22 2017, 09:07 AM
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#9
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Member Group: Members Posts: 64 Joined: 11-June 15 From: capitola,ca Member No.: 18,841 Region Association: Northern California |
I believe its a grounding issue behind he wheel. Take it off and take a look at the contact that the red wire is using on the metal ring on the back side of that wheel hub. That is how it gets its ground, so it needs to be a great connection, and super clean. its two rings, one wire from below (brown/white) to the lower ring, and your red lead is connected to the upper ring. rich (IMG:style_emoticons/default/agree.gif) appears to be a short there,maybe the contact ring isn't right,but we don't know if its a stock one or Lecarra one depends on the boss used of course. Just fitted momo adaptor and other aftermarket wheel,touch the horn wire to the wheel and all is load and clear. Thanks, better photos here; http://forums.pelicanparts.com/porsche-914...ring-wheel.html |
Dave_Darling |
May 22 2017, 11:12 AM
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#10
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914 Idiot Group: Members Posts: 14,981 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California |
Up through 72 or 73 the horn does not have a relay. Power gets sent to the horn full-time, and the wire in the center column provides the ground.
Getting a spark from the connection says that some wiring is very funky, but I don't know how that wire is run. Trace it and look for connections. Those could be weak or dirty. --DD |
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