Short in the system - Team Camaro Tech
Electrical & Wiring Troubleshooting electrical.

 
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post #1 of 12 (permalink) Old Sep 4th, 09, 02:06 PM Thread Starter
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John
 
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Short in the system

I was driving around today thinking finally I've got the car working when my radio started to turn off and then on. This happened about the same time that I could hear crackling from what I thought was a bad connection coming from somewhere under the dash. When I pulled into the garage to troubleshoot I found that the switch to my nitrous no longer worked nor did my courtesy/dome lights or lighter. I looked in the fuse box and the courtesy light fuse was blown. I replaced it but as soon as I touched the fuse to the contacts it popped immediately.

I have no idea where to begin on this one. DO you think that it could be a bad ground? How do I go about trying to troubleshoot this one? Thanks guys.
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post #2 of 12 (permalink) Old Sep 4th, 09, 04:21 PM
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Re: Short in the system

You need to isolate the problem.... disconnect as much as possible from that circuit and then add them back one at a time until the symptoms reappear.
It's a PITA, especially if you don't know whats all is on that circuit, but it's really the only way to do it.

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post #3 of 12 (permalink) Old Sep 4th, 09, 07:22 PM Thread Starter
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Re: Short in the system

Thanks for the advice. I had a look again this evening and really have no idea what to think. Can anyone lend a hand or recommend an auto electrician here in St. Louis? I have learned a lot in the short time that I've owned my Camaro, but I am lost with this one. Thanks guys.
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post #4 of 12 (permalink) Old Sep 6th, 09, 09:02 AM Thread Starter
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Re: Short in the system

I must have a loose wire somewhere. I tried repolacing the fue 2 times on Friday but it popped instantly. I gave up, drove the car a bit and parked it. TOday, I wanted to verify that my nitrous system was on the same circuit as the courtessy lights by trying another fuse just to see if the light turns on breify before it blow.... but everything was fine! The fuse didn't blow! So, I guess that I need to find the loose connection. Could this be a bad ground?
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post #5 of 12 (permalink) Old Sep 6th, 09, 09:16 AM
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Re: Short in the system

Popping fuses means a short in that circuit. Loose wire, worn through casing, etc. Yes it is a pain but you will have to start digging. Process of elimination.
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post #6 of 12 (permalink) Old Sep 6th, 09, 09:20 AM
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Re: Short in the system

You dont have a lose connection. If the fuse blows then you have a dead short. But it is going away since you put a fuse in and it did not blow.

You have a wire that is cut or pinched that is touching ground somewhere in that circuit. You will have to trace all the wires in that circuit to see if they are cut somewhere. You also need a electrical drawing for your car so you know what colors are in that circuit.

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post #7 of 12 (permalink) Old Sep 6th, 09, 09:30 AM
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Re: Short in the system

Quote:
Originally Posted by Sauron67MM View Post
Popping fuses means a short in that circuit. Loose wire, worn through casing, etc. Yes it is a pain but you will have to start digging. Process of elimination.
My apologies for being vague. A "live" loose wire coming into contact with ground causing a short.
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post #8 of 12 (permalink) Old Sep 6th, 09, 10:22 AM Thread Starter
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Re: Short in the system

Thanks guys, I had a look around again, but there is much aftermarket crap on the car that nothing corresponds to the original wiring diagram.

A side question, for you nirous guys, is it normal to have the nitrous system wired into the courtesy light/lighter? It just seems weird that it would be wired into a "Always on" power source.
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post #9 of 12 (permalink) Old Sep 7th, 09, 01:41 PM Thread Starter
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Re: Short in the system

I found the culprit.. I think....
I found this live wire just hanging above the glove box. It was shorting lots of things out. I haven't had the issue return after closing this live wire up. Anyone know that this could be? There were lots of old wiring harneses back there that weren't being used. They must have been from the old stereo/AC unit.

Also, does anyone know how hot the dome light sholud get? My bulb got so hot that it melted the enclosure and the plastic cover!

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post #10 of 12 (permalink) Old Sep 7th, 09, 04:45 PM
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Re: Short in the system

First off - good work finding the short. More often than not, people will use the phrase "short" to describe an open circuit. Looks like you had a bonafide short.

I've got that same mystery plug in my 68. Mine has a transparent plastic housing around it. I think someone said it was part of an A/C option (though my car didn't have A/C). Perhaps someone here will know.

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post #11 of 12 (permalink) Old Mar 19th, 10, 08:40 AM
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Re: Short in the system

glove box light connection.
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post #12 of 12 (permalink) Old Mar 19th, 10, 08:48 AM
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Re: Short in the system

yes glove box light 12 volt power connection.


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