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Unread 09-20-2013, 04:55 PM   #1
1978CJ7Beast
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1978 CJ7 
 
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Location: Arlington, VA
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Simple Wiring 101 Question for Jeep CJ7

I have a 1978 CJ with a 304. When I bought it, additional electrical additions included: Fog lights, 4 rear speakers, CB, non-factory under-dash lights (2), horn button, after market radio/tape deck, and an aftermarket clock mounted where the ashtray typically is on the dash. The wiring is a mess - but it was running ok.

A couple weeks ago, my uncle and I did some work on it - including dropping the gas tank to clean it out (there was mud in the fuel filter), removing the CB and fog lights. Now, I have intermittent stalling!!! My experience is intermittent stalling is tough to diagnose.

MY QUESTION IS: Could the simple removal of non-factory additions like this cause the electrical system to start functioning improperly???? That is, even if all these additional components were poorly wired...could removing erroneously wired components from a less than perfect system cause stalling? For example, before we even removed it, the CB didn't work and the speakers in the back sounded bad.

A mechanic helping us has already discovered one wire from the coil is overheating (that's at least one electrical problem).

To fix the intermittent stalling, we've replaced the ECM, distributor, coil, fuel pump and the carb is being replaced next week. Battery, alternator, plugs, distributor cap and plugs are good. It's running better now...but I won't know for sure if everything is 100% until the new carb is in. Obviously, I'm having trouble diagnosing whether it's a fuel delivery problem or electrical (or both).

I'm now approaching the option of getting a new wiring harness - which I'm hoping I don't have to do. I almost want to re-wire back the CB and fog lights because the old system worked when they were part of it.

Could removing the CB and Fog Lights cause/start such problems??????

Thank you!

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Unread 09-20-2013, 05:19 PM   #2
CJ7-Tim
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Quote:
Originally Posted by 1978CJ7Beast View Post
Could removing the CB and Fog Lights cause/start such problems??????
Highly unlikely. Turned off, and removed, are the same difference, no electrical energy is flowing. Unless you created a short circuit somehow when you removed them.

Since you mention work on the fuel system recently, that is the logical place to start your diagnostics.
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Unread 09-21-2013, 07:23 PM   #3
1978CJ7Beast
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Thanks for your reply.

A follow-up question: If we did create a short circuit by removing a couple items....would the Jeep start or run at all?
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