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Unread 04-25-2013, 04:14 PM   #1
wml001
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1979 CJ7 
 
Join Date: Apr 2013
Location: marietta, oh
Posts: 6
Help.. No tailights, signals, fuel gauge,

I have a 1979 Cj7, the lights in the rear arent functioning, they bulbs are new, the housing etc is all new. The CJ, runs fine all electrical in engine bay is fine, I have a 302 in it, but nothing electrical beyond firewall working. Anyone have any ideas?

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Unread 04-26-2013, 03:43 AM   #2
John Strenk
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1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 13,248
Dash light work?
Brake lights work? Turn signal Work?

need mo info..
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Unread 04-26-2013, 09:35 AM   #3
texasdave
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1980 CJ7 
 
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Location: Killeen, Texas
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Bad grounds. Where is last place in the circuit do you have voltage?
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Unread 04-26-2013, 10:27 PM   #4
wml001
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No ligts in the dash are on, and I have no accesories. No turn signals, hazard works only in rear driverside light, running light/license plate light work when the right blinker is switched on. I tried running a ground directly from the batter to the only ground I could find from this harness, still nothing at the passenger side. The tailights are newer style, the type that ground within the unit, however there is a ground at the end of the wiring harness on the passenger side, I removed cleaned and sanded the ground still nothing. Also
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Unread 04-27-2013, 03:22 AM   #5
John Strenk
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Quote:
Originally Posted by wml001 View Post
No ligts in the dash are on, and I have no accesories. No turn signals, hazard works only in rear driverside light, running light/license plate light work when the right blinker is switched on. I tried running a ground directly from the batter to the only ground I could find from this harness, still nothing at the passenger side. The tailights are newer style, the type that ground within the unit, however there is a ground at the end of the wiring harness on the passenger side, I removed cleaned and sanded the ground still nothing. Also

I think the ground you found is only for the marker light. It wouldn't help you for the ground you probably need. There are no ground in the OEM harness. And all your troubles do sound like a grounding problem. Almost sounds as if the battery (-) is not grounded to the tub. If it's a steel tub then a wire from the battery to the tub is needed and if it's fiber glass then you will have to find the common grounding point and make sure it's connected to the to the battery.

Do you have a steel or fiberglass tub?
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Unread 04-27-2013, 11:51 AM   #6
wml001
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1979 CJ7 
 
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Location: marietta, oh
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I have a steel tub, I just find it odd, because the front headlights work, everything within the engine compartment works, and the windshield wipers randomly started working. I will follow the ground from the battery and see where it goes, and let you know. Thanks
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Unread 04-27-2013, 11:54 AM   #7
wml001
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The ground from the battery, goes directly to the top of the engine manifold. Update, I now have turn signals in the rear, I re-wired everything back there, still not locating any sort of ground

Last edited by wml001; 04-27-2013 at 02:01 PM..
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Unread 04-27-2013, 03:15 PM   #8
Stormpaw
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1983 CJ7 
 
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Location: Dutch Harbor, Alaska
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I would highly recommend checking out Jeephammer's post on dedicated grounds.

Basically, AMC was cheap and didn't install any dedicated grounds. Instead, they grounded everything to the body or chassis. However, steel isn't a great conductor to begin with. Add paint, rubber body mounts, and 35 years of corrosion and you are bound to have some electrical problems. Running a couple ground wires is pretty simple and, I am guessing, will probably eliminate the problems you are having.

I hope that helps.
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Unread 04-27-2013, 03:27 PM   #9
wml001
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1979 CJ7 
 
Join Date: Apr 2013
Location: marietta, oh
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I took a look at it, I agree that there is something not grounding out properly.. I have break lights, turn signals and hazards now, still no running lights. I'm running out of ideas.
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Unread 04-27-2013, 07:11 PM   #10
jimdubose
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1978 CJ5 
 
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Location: Palmetto, Florida
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do you have one of these?

http://www.offroaders.com/tech/Jeep-...grams-1978.htm

come in handy in situations as the one you describe
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