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Big Willy
Race Fan


USA
12 Posts

Posted - 08/25/2010 :  8:33:48 PM  Show Profile  Visit Big Willy's Homepage  Send Big Willy a Yahoo! Message Send Big Willy a Private Message  Reply with Quote
Trying to debug an electrical issue with my 73. Anyone know of a good mechanic who is good with automotive electrical?

From what I can tell, the brake lights (outer set) are crossed into the headlight circuit somewhere, as they stay on 100% of the time when the headlight/running lights are on. To top that off, the inner set stay on when the ignition circuit is turned on. After trying to figure this out, I have come to the conclusion that it is time to let someone who knows what they are doing have a look. I appreciate any reccomendations you may have. Thanks!

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RedDragon
Pit Crew



USA
53 Posts

Posted - 08/26/2010 :  1:18:20 PM  Show Profile Send RedDragon a Private Message  Reply with Quote
Wow, both you and Matt are having electrical issues, must be going around. I just rewired most of my 67 and it wasn't that bad. Here are some links to wiring diagrams, hope they might help...

[url]http://www.nastyz28.com/index.php?page=camarowiring[/url]

[url]http://www.nastyz28.com/camaro/wire/73w-ip.jpg[/url]

[url]http://www.nastyz28.com/camaro/wire/73w-eng.jpg[/url]
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Big Willy
Race Fan



USA
12 Posts

Posted - 08/26/2010 :  4:16:58 PM  Show Profile  Visit Big Willy's Homepage  Send Big Willy a Yahoo! Message Send Big Willy a Private Message  Reply with Quote
I was looking at buying a rear harness from american autowire, and just rewiring the whole darn thing instead of trying to figure out what the other guy did. Found a lot more black tape than I wanted to see. That, and it just too dang hot outside to be messing with it right now.

Here is a pic of the 73: You must be logged in to see this link.
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tcrsprint97
Crew Chief



USA
464 Posts

Posted - 08/27/2010 :  6:20:43 PM  Show Profile Send tcrsprint97 a Private Message  Reply with Quote
For the record, mine is an easy fix but with school starting I haven't had the time to fix it. It happened right when we got home from the show in Arroyo Grande. Typical Chevy, it gets you home before it breaks down. Instead of (Found On the Road Dead)....
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tcrsprint97
Crew Chief



USA
464 Posts

Posted - 08/27/2010 :  6:25:01 PM  Show Profile Send tcrsprint97 a Private Message  Reply with Quote
Don't the outer set usually stay on when the headlights are on? The inner set sounds like a bad brake switch or it's tied in to 12 V switch power. Probably crossed wires at the tailights.
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tcrsprint97
Crew Chief



USA
464 Posts

Posted - 08/27/2010 :  6:31:32 PM  Show Profile Send tcrsprint97 a Private Message  Reply with Quote
Sorry, about that. If I read the wiring diagram correctly, the inner lights are back up lights like on my '68? Those should be connected to the back-up switch. If the switch were bad or it was eliminated, the lights would stay on whenever the key was on. I have a Hurst shifter with the switch built-in along with the neutral safety switch.
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Big Willy
Race Fan



USA
12 Posts

Posted - 08/28/2010 :  07:23:48 AM  Show Profile  Visit Big Willy's Homepage  Send Big Willy a Yahoo! Message Send Big Willy a Private Message  Reply with Quote
I bought a laminated diagram of the electrical system over on nastyz28.com earlier this week. I got it last nite, and did a little studying. Im hoping to have it figured out in time to make the cruise.
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Big Willy
Race Fan



USA
12 Posts

Posted - 08/30/2010 :  5:53:38 PM  Show Profile  Visit Big Willy's Homepage  Send Big Willy a Yahoo! Message Send Big Willy a Private Message  Reply with Quote
Wiring appears to match the diagram. Black tape was the factory wrap I was seeing. I found one loose ground, but everything else looks decent. Narrows it down quite a bit. I think the pressure switch on the proportioning valve might have died. The local autozone pulled up a part number for a plastic switch that mounts on the pedal assembly. Never even heard of this little dude, but I will try replacing that as well. As for the inner/backup lights staying on, I need to hunt down the backup switch. I dont think the car was an original 4 speed car, as the steering column has the automatic shifting linkage attachments. The backup switch was on the column, right?
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tcrsprint97
Crew Chief



USA
464 Posts

Posted - 09/02/2010 :  10:48:54 PM  Show Profile Send tcrsprint97 a Private Message  Reply with Quote
My car has the plastic brake switch like you said. Pressure switch on the prop valve might actually be the brake failure warning switch. Fixed my electrical issue today, so I'm all ready for La Mina's Cars & Cigars this Saturday on Auburn. If anyone interested, it starts about 5.
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alexbarb
Race Fan



1 Posts

Posted - 11/26/2012 :  11:38:22 PM  Show Profile Send alexbarb a Private Message  Reply with Quote
Here i got some good solution for some electrical problems with which i am dealing from the long. Now i think i could easily resolve these problems now.
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Revo1
Administrator



USA
413 Posts

Posted - 11/29/2012 :  12:29:27 AM  Show Profile  Send Revo1 an AOL message Send Revo1 a Private Message  Reply with Quote
Holy necro!
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