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  #1  
Old 02-10-2018, 01:01 PM
ls3waggy ls3waggy is offline
232 I6
 
Join Date: Dec 01, 2014
Location: AZ
Posts: 124
Wiring Issue

I picked up a brand new body harness for the Wagoneer.

With everything plugged in the marker lamps and tail lamps stay on. Headlights function normal.

A few things to note: the license plate light isn't plugged in, as well as the washer bottle. And the switch is from a 1980, the harness itself is a 79.

Any idea's before I go crazy with this?
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  #2  
Old 02-11-2018, 02:02 PM
johnsonic johnsonic is offline
258 I6
 
Join Date: Mar 12, 2015
Location: Oregon
Posts: 286
What year is your Jeep?
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1984 GW
360
Comp 260H
Harland Sharp Roller Rockers
Wiseco -21cc Forged Pistons
Performer Intake
Holley SA 670
MSD 8523
Dakota Digital custom cluster
Serehill headlamp harness
NWMP aux tank

1987 GW deceased
...but the parts live on
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  #3  
Old 02-11-2018, 08:12 PM
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ZackN920 ZackN920 is offline
350 Buick
 
Join Date: Nov 18, 2015
Location: Stephenson County, IL
Posts: 924
Maybe the headlight switch is bad. Contacts stuck in position to have the tails and markers on. If you can, test it with a multimeter to find out if that's the case.
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1990 Grand Wagoneer-"The Wagon"
AMC 360, TF727, NP229, 2.72 gears, 2" lift
Rancho 44044 springs, Rusty's 2" AAL, TFI w/ MSD C/R
...not too rusty anymore
...But still lookin' like a pos. an awesome pos
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  #4  
Old 02-12-2018, 11:06 AM
ls3waggy ls3waggy is offline
232 I6
 
Join Date: Dec 01, 2014
Location: AZ
Posts: 124
The Jeep is a 1980. The harness I picked up was for a 79.

Also it does this with the headlight switch unplugged
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  #5  
Old 02-12-2018, 11:20 AM
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babywag babywag is offline
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Join Date: Jun 08, 2005
Location: Land of froot loops and cukcoo-nuts, CA
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Define body harness...

Why did you replace, vs. just repair what you had? What problem were you having prior to replacement.
Electrical is tough to diagnose via the net, but I'd start with tracing back and figuring out why it has power to lights, when it should not.
Sounds like a short, or a difference in harness w/ pinout.
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88 GW, 67 J3000, 07 Magnum SRT8
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  #6  
Old 02-12-2018, 03:20 PM
ls3waggy ls3waggy is offline
232 I6
 
Join Date: Dec 01, 2014
Location: AZ
Posts: 124
Quote:
Originally Posted by babywag
Define body harness...

Why did you replace, vs. just repair what you had? What problem were you having prior to replacement.
Electrical is tough to diagnose via the net, but I'd start with tracing back and figuring out why it has power to lights, when it should not.
Sounds like a short, or a difference in harness w/ pinout.
Engine, body, basically all stock wiring was replaced when I did the frame off. The truck is LS swapped so a few of the engine harness wires like the wires were de pinned from the harness block.

I wanted a fresh start when i started the project because the harness that was on the truck before had quite a few issues.

And that's what I'm going to start doing, just curious if this specific thing has happened to anymore before I start going crazy.
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  #7  
Old 02-12-2018, 03:43 PM
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Woodchomper Woodchomper is offline
350 Buick
 
Join Date: Dec 17, 2002
Location: Saint Charles, Missouri
Posts: 923
I just helped a friend fix wiring on a '30 Ford coupe he is building. Basically when he hit his brakes the front turn signals came on with the brake lights. The problem turned out to be a faulty turn signal mechanism in the cheap Chinese Ebay tilt steering column.

For your problem I would start by unplugging the steering column turn signal connector and start chasing wires.

Good luck.
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1991 GW 401 /727TF/NP229 /4" Skyjacker /EBL TBI /CS-144
1981 J10 401 /727TF/NP208 /6" Superlift /CS-144
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  #8  
Old 02-12-2018, 05:27 PM
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babywag babywag is offline
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Location: Land of froot loops and cukcoo-nuts, CA
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maybe the column pinout changed in ‘80 vs. ‘79?
compare your ‘80 column plug on old harness to replacement harness
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88 GW, 67 J3000, 07 Magnum SRT8
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  #9  
Old 02-18-2018, 10:32 PM
ls3waggy ls3waggy is offline
232 I6
 
Join Date: Dec 01, 2014
Location: AZ
Posts: 124
Turns out the replacement brake switch was faulty.

Plugged it back into the stock one and everything worked great
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