1972 horn relay - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 3 (permalink) Old May 2nd, 14, 8:36 PM Thread Starter
Duane
 
Join Date: Apr 2014
Location: canada
Posts: 7
Thumbs down 1972 horn relay

I put a post on here last week but it appears to be gone.anyway a wire that runs from the horn relay down through the firewall burnt when I tried to start the car.nothing happened at the starter.the interior lights went out.its a 72 chevelle.can anyone tell me what's going on.do I have a bad relay or starter maybe.it was working fine before that. I am lost
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post #2 of 3 (permalink) Old May 2nd, 14, 8:50 PM
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Joe
 
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Re: 1972 horn relay

Quote:
Originally Posted by blackbear62 View Post
I put a post on here last week but it appears to be gone.anyway a wire that runs from the horn relay down through the firewall burnt when I tried to start the car.nothing happened at the starter.the interior lights went out.its a 72 chevelle.can anyone tell me what's going on.do I have a bad relay or starter maybe.it was working fine before that. I am lost
Was your post here in Electrical? I don't remember seeing it. Regardless....


Sounds like you fried your fusible link that protects the interior of the car. When this blows, all power is lost to interior, dash and dash-fed circuits (headlights, tail lights, starter).

You need to determine why it blew. One scenario is the purple wire that that "triggers" the "S" terminal on the starter solenoid got melted on the hot exhaust manifolds or headers, and then got shorted to ground. The next time you went to start the car, you sent 12 volts directly to ground (dead short) and the fusible link burned to protect the car from fire.

Do you still have 12 volts at the threaded stud on the horn relay where all the wires "bolt" together?

-If you don't stand for something, you'll fall for anything.
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post #3 of 3 (permalink) Old May 2nd, 14, 8:59 PM Thread Starter
Duane
 
Join Date: Apr 2014
Location: canada
Posts: 7
Re: 1972 horn relay

All the interior lights come back on when I let go of the key but the wire I was talking about is soft now.i will have to check the purple wire
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