Weird Ignition and RS headlight door problem - Team Camaro Tech
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post #1 of 6 (permalink) Old Dec 22nd, 10, 09:28 PM Thread Starter
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Jason
 
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Weird Ignition and RS headlight door problem

I have a very odd problem with the ignition on my 67 rs/ss 396. when i bought the car the headlight doors were not working. The car ran fine otherwise. I started troubleshooting the headlight doors and noticed that someone had placed an inline fuse in the orange wire from the 10 amp circuit breaker on the relay panel for the headlight doors and shortwired the circuit breaker presumably because the circuit breaker was bad. The inline fuse was blown and i replaced it, pulled the headlight switch and -the doors opened. Great. then i turned on the ignition to get the doors to close and heard what sounded like an electrical arcing noise for a few seconds and the fuse blew. I assumed there was a short in the headlight door wiring and started looking. long story short, after many fuses i found that the ignition is arcing across the contacts in the distributor cap. if i unplug the coil wire and repeat then it arcs from the coil to ground, this is WITHOUT cranking the engine. this only happens if the fuse is present in the headlight door circuit, otherwise everything functions and drives normally. The car has an MSD ignition. Anyone with any idea what in the world would cause this would be much appreciated!!!!
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post #2 of 6 (permalink) Old Dec 22nd, 10, 11:57 PM
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Re: Weird Ignition and RS headlight door problem

Sounds like you are getting a back feed from somewhere in the headlight door circuit. Pictures of the wiring might help. The headlight doors really need to be run through a relay - they draw too many amps to be run directly with an inline fuse which is the weakest protection from an electrical fire. I would strongly recommend you find out where the short is with a tester and not keep blowing fuses.

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post #3 of 6 (permalink) Old Dec 23rd, 10, 07:30 AM
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Re: Weird Ignition and RS headlight door problem

I would get a 67 wiring diagrahm for the RS headlights and start tracing wires. Make sure no wires are hooked up incorrectly. Probably needs a new control board. You said they PO had it jumpered across the controller.

Mike
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post #4 of 6 (permalink) Old Dec 23rd, 10, 10:12 AM Thread Starter
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Jason
 
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Re: Weird Ignition and RS headlight door problem

Quote:
Originally Posted by prostreet69camaro View Post
I would get a 67 wiring diagrahm for the RS headlights and start tracing wires. Make sure no wires are hooked up incorrectly. Probably needs a new control board. You said they PO had it jumpered across the controller.

By controller do you mean that 10 amp circuit breaker on the relay panel that they jumped? or is there another control board that i'm not aware of... sorry i'm new to camaros and still figuring out where everything is.

What's the best way to find a short without blowing fuses??

Any ideas how or why this would feed back through the ignition coil??
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post #5 of 6 (permalink) Old Dec 23rd, 10, 10:43 AM
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Re: Weird Ignition and RS headlight door problem

Quote:
What's the best way to find a short without blowing fuses??
Insert a test lamp in place of the fuse. It'll light up bright when the short is present. Start moving wires around, disconnecting connectors etc. until the light dims or goes out.

A light bulb acts like a current regulator and gives the added benefit of a visual indication of current flow.

Dave
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post #6 of 6 (permalink) Old Dec 23rd, 10, 12:56 PM Thread Starter
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Jason
 
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Re: Weird Ignition and RS headlight door problem

thanks Dave, that's a good tip, will definitely use that one.

After some more poking around I disconnected the distributor from the MSD control unit and the headlight doors now open and close perfectly without any overcurrent or other issues.

So when the ignition control box is disconnected the headlight doors work fine and when the headlight door circuit fuse is disconnected the ignition seems to operate properly. So which system is my problem and how are the two even interrelated??? I did check to make sure the MSD control unit wasn't wired to the head light circuit or something stupid like that. The red wire on the MSD box runs to the starter battery cable and the ground runs to the frame.

Any ideas? Thanks!
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