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Unread 01-11-2010, 08:41 PM   #1
slymongoose
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turn signal problems on 80 cj7

my turn signals have been acting strange .. at first it seemed like the right turn signal was working fine but the left one didn't work at all....the light would stay lit on the instrument cluster, but that's it. nothing would happen with it.
so i was thinking of replacing the switch in the steering column ...

but now it seems like i can get both turn signals to work, if the headlights are off. when i turn the headlights on, the turn signals stop working (neither of them work).

so now i'm a little confused....could it be the head light switch? or bad wiring?
even when they are working, the turn signal switch on the column still seems to be acting a little weird...sometimes i'll have to wiggle it to get the turn signal to come on.

any suggestions? thanks!

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Unread 01-11-2010, 08:54 PM   #2
Aduffy32
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check your grounds. it usually solves the problem.
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Unread 01-12-2010, 03:59 AM   #3
John Strenk
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Sounds like you first have a ground problem like Aduffy32 says but you may be headed into a switch problem down the road.
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Unread 01-12-2010, 04:14 AM   #4
cw4stein
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x3 for the grounds. I had the EXACT same issue on my 81 when I bought it. The ground was corroded and the screws that hold the lights to the grill were loose so the lights didn't have a solid connection.
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Unread 01-12-2010, 06:35 AM   #5
Mike Romain
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The rear fixtures use the bolts for the ground and the front fixtures use special shoulder screws for the ground for the signals. The running lights use a wire for the ground in the back.

If your screws aren't tight or are rusty, you can have your symptoms. Lots of folks that put brush guards on the lights have this issue too because the bolt moves to a rusty spot.
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Unread 01-12-2010, 12:17 PM   #6
slymongoose
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thanks for the replies, i'll check the grounds and see what i can find out.
so ... what you guys are saying is that the bad ground might not necessarily be under the dash? it could be around the headlights or tail lights even?
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Unread 01-12-2010, 06:45 PM   #7
cw4stein
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The factory ground wire is connected to the grill. The turn signals rely on the light housings being solidly connected (grounded) to the grill. In my case, the screw holes in the grill were worn out and the screws were always loose. I ended up repairing the holes and getting 4 new screws and all is right with the world. I also disconnected the factory ground wire, cleaned and burnished the mounting area, and installed new hardware there too.
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Unread 01-12-2010, 07:16 PM   #8
jeepduo
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I think everyone has agreed, bad ground. Jeeps are notorious for that.
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Unread 01-12-2010, 07:27 PM   #9
Aduffy32
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your telling me... Just finished spending hours re-wiring the back of my jeep. :/
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Unread 01-13-2010, 06:03 AM   #10
Mike Romain
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Quote:
Originally Posted by slymongoose View Post
thanks for the replies, i'll check the grounds and see what i can find out.
so ... what you guys are saying is that the bad ground might not necessarily be under the dash? it could be around the headlights or tail lights even?
Not really, the turnsignal grounds aren't around anything, they are the actual bolts and screws that hold the fixtures on. Rusty or loose bolts or screws = no ground.
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Unread 01-13-2010, 08:50 AM   #11
John Strenk
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Quote:
Originally Posted by slymongoose View Post
thanks for the replies, i'll check the grounds and see what i can find out.
so ... what you guys are saying is that the bad ground might not necessarily be under the dash? it could be around the headlights or tail lights even?
there are very few things grounded on the dash. Mainly gauges and dash lights.

Just about every other electrical component is grounded at their mounting point.
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Unread 11-13-2013, 06:44 PM   #12
Jeeper4x
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Turn signal issues

Speaking of turn signal issues. My 79 cj7 has a problem. The left signal works fine, but when you turn on the right signal, my dash lights flash, both the rear signals flash. Also both front flash, only on the right side. When you turn on the lights the same thing happens. Any suggestions?
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Unread 11-13-2013, 06:46 PM   #13
Jeeper4x
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Oops

It's a 77 on a 79 frame, with 84 wide track axles
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Unread 11-14-2013, 09:30 AM   #14
John Strenk
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Dash lights flash on and off with the headights either on or off?

Has anyone messed with the harness?
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Unread 11-15-2013, 11:47 AM   #15
Jeeper4x
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When the headlights are on. The dash lights don't flash, but the right signal don't work. When you turn off the headlights, the signal works, but all four flashes and so does the dash lights
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