1990 Jeep YJ 4.2L - Under Dash Wire identification HELP - Jeep Wrangler Forum
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Old 09-27-2017, 02:59 PM
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1990 Jeep YJ 4.2L - Under Dash Wire identification HELP

Hello,

I have been trying to sort out a few wiring issues under the dash and need some help.

Wire locations:
1. Looking from drivers side under the dash
2. Right of the steering column but left of the ashtray.
3. Green circle - Orange/Red and Black wire with plastic connector?
4. Purple wires x2 connected into a rubber boot like connector? Also looks like someone spliced into at one time due to the yellow connector.

Thanks all for looking and trying to help out

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Old 09-27-2017, 04:16 PM   #2
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Orange & black wires circled in green, looks like a bulb socket. Perhaps for the heater control.

Circular rubber "L" shaped plug in purple circle probably goes to the cigarette lighter.

Need a better pic of the wires secured in the yellow twist connector. (purple circle).

Looks like you have a bunch of post manufacture wiring. Maybe some of it's for your radio.

Good Luck, L.M.

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"Wrangler....It's not just a vehicle, It's a lifestyle".
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1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
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Old 09-27-2017, 05:19 PM
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Thanks LuckMac! I appreciate your help.

Yes the stereo wires were all cut so it is a little mess trying to sort this stuff out.

Purple circle with the purple wires looks like at one point they broke or were spliced for (radio) that is why they yellow connector. So on the back of the cigarette lighter I only have one black wire connected to the side. Would this plug directly into the back of it?

Green circle. Well my heater doesn't work so that could be. Not sure where this would plug in. So you are thinking Light bulb to light the controls?

Attached is a close up of the 2.


Also after inspecting a little more under I found 2 more not plug in.
I do not have air conditioning so maybe one would go to that.

Image that has the white circles with numbers.

1. Plastic plug with white, green and black wire? Looks like this would reach steering column and plug in on the right side of the column. Looked at wire diagram and think this would be for the Fog lights.

2. Plastic plug with blue/white, green/black and a black wires. Maybe this was for A/C?
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Old 09-27-2017, 09:43 PM   #4
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Will a peanut bulb go into the black plug with the orange and black wires? If so, it probably plugs (insert & twist) into an opening on the back of the heater control panel.

Do you have two switches in a recess just to the right of the steering column on the lower part of the dash?
One switch should be for the fog lamps and the other ....I don't remember, but try to fit those plugs on the backs of the switches if you in fact have them.

Good luck, L.M.
__________________
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 09-28-2017, 11:16 AM
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Ok so I have taken most of the dash apart.

The wire that you can put a bulb into is not for the heater control as I found out there is another bulb attached to the right of the heater control.

I think that wire is an accessory light (small bulb) I think #74 and it is suppose to light the fog lights and defogger switches. This is my guess because I do not have those switches as mine is a base model. The good thing is I can add my own now.

If you have those switches could you look to see if you have that small light. It looks like there is a black green plastic window it sines through to illuminate the switches? From behind it looks like it would sit below the speedometer.

The other plugs I will label and tie up since I do not have fog lights or AC/defogger
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Old 09-28-2017, 11:42 AM   #6
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My Jeep is also a base model 1987. I didn't have those switches, so I didn't have fog lights or rear defroster (no hard top from factory).
I bought a used switch set and made my own fog/driving light harness rather than use the one from the factory (there was no pigtail at the front bumper for the lights and no relay that I could find).
I suppose I could wire the rear defroster and wiper to function on my hard top, but having them functioning is so low on my list of things to do for my Jeep that I don't expect to ever get to it.

The black wire with a spade terminal that attaches to the side of your cigarette lighter housing is the ground. The other wire that powers it is the black "L" shaped terminal with a round opening that is circled in purple in your first post. It pushes onto what looks like a bolt in the center back of the lighter housing. It should be hot with your key in the "on" position. Check it with your multi-meter.

Good Luck, L.M.
__________________
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 09-28-2017, 07:20 PM
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Ok thought I would follow up with what I found.

Circled in Green again is the wire which takes a #74 bulb. Accessory Light. Also you can see when I took the whole dash apart the other circle is the holder where it goes. This lights the area below that would have 3 switches for Fog lights, Defrost for hard top! Second image tries to explain where it is.

Thanks for the Help Luck Mac

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