1977 CJ-7 electrical problem..turn signals - JeepForum.com
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post #1 of 9 Old 09-06-2009, 09:46 PM Thread Starter
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1977 CJ7 
Join Date: May 2009
Location: charlotte
Posts: 9
1977 CJ-7 electrical problem..turn signals

I've got a 77 CJ-7 ,258 , 3 speed, just got through putting it back together with all new lights and now I have a very different problem. All the lights work, but the left turn signal will not work if the headlights are on, the right one works with the headlights on or off, and the left works if the headlights are off, but if you turn them on the left side stops. All other lights are working fine, just that one issue. Any suggestions?

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post #2 of 9 Old 09-06-2009, 09:50 PM
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1985 CJ7 
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Location: Tucson, AZ
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post #3 of 9 Old 09-06-2009, 09:54 PM
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1984 CJ7 
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Location: Greensboro NC
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Sounds like a ground problem. Start there using a volt meter to check your grounds

"You can let people think you are a dumba** or open your mouth and prove it."
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post #4 of 9 Old 09-06-2009, 10:08 PM
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1979 CJ7 
Join Date: Aug 2008
Location: Howard City
Posts: 8
Check your bulkhead/firewall connection

I had a very similar problem that I chased for a month. I tried a new turn signal switch, new ground, you name it, I tried it?

I found my answer in the bulkhead connector at the firewall. The previous owner didn't install the connector properly by failing to provide an adequate sized hole in the fiberglass fire wall. Therefore, the connector was drawn tite with the center bolt only partially. So when I wiggled the connector I could run my headlights and the turnsignals simultaneously. I had to make the firewall opening slightly larger to make sure that both halves of the bulkhead connector would engage fully. This cured my problem.

Good luck to you.
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post #5 of 9 Old 09-07-2009, 06:04 AM
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1997 TJ Wrangler 
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Location: Remlap, AL
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I've noticed that PO's can be a real pain in the butt. My PO simply ran new single wires to toggle switches implanted at various locations on the dash. Its like turning on the old family mixer anytime you want see at night. And my blinkers have the same problem. Im gonna pull the firewall connector and clean/inspect it real good. Maybe I can revive some of these dead lights.
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post #6 of 9 Old 09-07-2009, 11:13 AM
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1978 CJ5 
Join Date: Dec 2008
Location: Palmetto, FL
Posts: 442
before i went into the column on mine and replaced a damaged turn signal cam,i 'd only get one blinker on and only when i hit the brakes, even the front turn signal would light along with the back. i had a problem with the lights extinguishing when i depressed the foot bright light switch, rewired it, then found a broken wire at the left front light. i would look at the grounds at all your front lights. i believe the PO was using this CJ to grow rust, i had to go through every ground and clean them and get good connections for every light, guage, indicator, etc. john strenk's posts are invaluable, you should check them out
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post #7 of 9 Old 09-07-2009, 11:30 AM
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1974 CJ5 
Join Date: Jun 2009
Location: north port, fl
Posts: 88
the po on my jeep made a real mess of the wiring. i have no idea what they did. turn signals are wonky. Only have high beams, no low beams. Have a slow draw on the battery somewhere, so they installed a battery kill switch. There's a random toggle switch for the headlights that kill the headlights...inside the engine compartment. Why? I have no idea. Strangest place I've ever seen for a switch.

lucky the thing runs at all.
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post #8 of 9 Old 09-07-2009, 06:16 PM Thread Starter
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1977 CJ7 
Join Date: May 2009
Location: charlotte
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I'm going to check the grounds Tues. AM. I should have added that the left turn signal that doesn't work with the headlights on is lite up like it's on but not blinking on front and rear.. I'm going to run a ground wire from the firewall ground (battery) to the ground lug behind the headlight and see what I get (the turn signals use the same ground I think). I will also do the same to the taillight if the front light doesn't change what it's doing. Then I will post with results or more questions...
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post #9 of 9 Old 09-08-2009, 09:20 PM Thread Starter
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1977 CJ7 
Join Date: May 2009
Location: charlotte
Posts: 9
Pulled headlights out and retapped the grounds on both sides and now everything works like a champ.....When in doubt - ground it!
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