How do you trace wires from engine bay to gauges? -
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Unread 11-13-2015, 04:26 PM   #1
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1984 J-Series Truck 
Join Date: Nov 2015
Location: Huntington, Texas
Posts: 2
How do you trace wires from engine bay to gauges?

I'm a newbie on the site. I have an '84 J-10. I received it in a trade. No engine, t179 4spd and rest of running gear in a basket case. I swapped in a Windsor 351. After I built mounts, It bolted right up to the tranny. I does however use a ford pressure plate and a Chevy clutch plate. Go figure? Anyway, I'm now working on wiring. I've got it the engine firing, but now I need some help on the gauge wiring.

Do I have to pull out the instrument cluster and check continuity or should I be able to apply a ground to the some of the engine sensor connectors?
I don't know for sure which ones are the sensor connectors for gauges or other modules. It looks like a spaghetti factory with all those wires.
Any help is appreciated.

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Unread 11-16-2015, 12:14 AM   #2
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1981 CJ7 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 5,128
You need the wiring diagram. has wiring diagrams for the 1984-1986 j trucks.

When i went through Mine I took the instrument cluster out so I could get to the big round plug on the back.

From there I was able to test each input in turn and track down the faults.

If it still doesn't work it may be cluster issues. Burnt and broken printed circuits are common but so are non-working gauges and voltage regulator.
BagusJeep lives in Bali.

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Unread Today, 06:13 PM   #3
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1978 FSJ Cherokee 
Join Date: Apr 2014
Location: Little Rock
Posts: 23
X2 on

The wiring diagram helped me tremendously. It looks scary at first but once you figure it out it will save you lots of time. It will also save you from pulling wire that you don't really need. I had to learn the hard way and have wires to remove now. Just take it one step at a time and you will have it in top shape in no time.
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