1994 YJ 4.0 dash lights flash when blinkers are on - JeepForum.com

 
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post #1 of 8 Old 06-01-2010, 11:23 PM Thread Starter
suchaconsumer
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1994 YJ Wrangler 
 
Join Date: May 2010
Location: Lake Stevens
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1994 YJ 4.0 dash lights flash when blinkers are on

Hey everyone. I am a brand new jeep owner and I am having some troubles with my wiring. I bought this rig on Thursday and I cant seem to get the blinkers to work right.

I have replaced the turn signal switch and the turn signal relay. I removed the hazard relay because I havent replaced it yet.

The hazards seem to be working properly. But I am not sure if the side markers are supposed to flash when hazards are on. Can someone confirm this?

When I switch the turn signal to left the green arrow flashes left but for some reason the dash lights flash as well. Also it seems as though all my lights flash as if I have hazards on.

When I switch my turn signal to the right both green arrows flash. The dash lights flash and the exterior lights flash as if hazards are on.

Note that it was behaving exactly the same before I replaced the turn signal switch.

Also note when I remove the dash light dimmer the dash lights stop flashing. But the exterior lights still behave the same.

Something has to be wired wrong but it is baffling me. Ive even pulled the headlight switch to make sure it wasnt interfering.

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post #2 of 8 Old 06-01-2010, 11:40 PM
monkeyhouse
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1997 ZJ 
 
Join Date: Sep 2009
Location: Cumberland, Maryland
Posts: 3,159
Quote:
Originally Posted by suchaconsumer View Post
Hey everyone. I am a brand new jeep owner and I am having some troubles with my wiring. I bought this rig on Thursday and I cant seem to get the blinkers to work right.

I have replaced the turn signal switch and the turn signal relay. I removed the hazard relay because I havent replaced it yet.

The hazards seem to be working properly. But I am not sure if the side markers are supposed to flash when hazards are on. Can someone confirm this?

When I switch the turn signal to left the green arrow flashes left but for some reason the dash lights flash as well. Also it seems as though all my lights flash as if I have hazards on.

When I switch my turn signal to the right both green arrows flash. The dash lights flash and the exterior lights flash as if hazards are on.

Note that it was behaving exactly the same before I replaced the turn signal switch.

Also note when I remove the dash light dimmer the dash lights stop flashing. But the exterior lights still behave the same.

Something has to be wired wrong but it is baffling me. Ive even pulled the headlight switch to make sure it wasnt interfering.
the side markers do not flash. Can't remember what thread I read that on, but they are not supposed to.

The emergency flasher switch is the same as the turn signal switch, you can swap them to test. I know it's too late to help now, but just FYI.

Biggest issue with those lights are grounds from the threads I have read. Check and clean all grounds involved.

First Jeep was an 1989 YJ, 6 cylinder 4.2L , 258. Nuttered and TeamRushed, Weber 38 DGES, Now, I'm venturing into the world of Grand Cherokees
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post #3 of 8 Old 06-02-2010, 01:08 AM Thread Starter
suchaconsumer
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1994 YJ Wrangler 
 
Join Date: May 2010
Location: Lake Stevens
Posts: 11
I think I have a bad brake light switch. At least that seems to be possible. Im going to check tomorrow
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post #4 of 8 Old 06-02-2010, 04:51 AM Thread Starter
suchaconsumer
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1994 YJ Wrangler 
 
Join Date: May 2010
Location: Lake Stevens
Posts: 11
Update

I cleaned all the lights and checked the bulbs. Ive removed all the wire harnesses and reconnected under the dash. Except one that I cannot get apart. The dash lights have quit flashing when the blinkers are on. But now when the blinkers are on either left or right they all flash in tandem.

Also I noticed another relay under the dash that is clicking when the flashers are on. It has a wire that runs from the radio harness, one ground, one 12v, one black with yellow stripe, and an orange wire that goes to who knows where. very strange. These Jeeps have the weirdest wiring IMO.

Im still thinking brake light switch unless anyone has any better suggestions.

Also there was a wire connector that I couldnt separate under the dash by the EBrake. Does anyone have a trick for that?
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post #5 of 8 Old 06-02-2010, 10:37 AM
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
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What happens to the flashers if you remove the relay under the dash that connects to the radio harness? Thats definely not stock. Try turning on you lights as well with that relay removed.
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post #6 of 8 Old 06-02-2010, 04:32 PM Thread Starter
suchaconsumer
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1994 YJ Wrangler 
 
Join Date: May 2010
Location: Lake Stevens
Posts: 11
The relay that is hooked to the radio harness is also tied to the brake light. You can hear it click when you press the brake. It looks factory even though I dont understand what it is for. Or why it is tied to the radio harness.

It is the same relay that is used for the horn under the hood. 56006707 83159 0254



Ive so far disconnected the entire dash harness besides the turn signal cable. And the harness that I cant get apart.

Weird...


All the flashers are still flashing regardless of what way I hit the switch
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post #7 of 8 Old 06-03-2010, 01:34 AM Thread Starter
suchaconsumer
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1994 YJ Wrangler 
 
Join Date: May 2010
Location: Lake Stevens
Posts: 11
Ok, I figured out why the lights were all flashing. PO ran a wire between the rear taillights. I think for an alarm but who knows.

the brake light switch was shot, and the headlight dimmer switch doesnt have any low beam.

Wow, that was a mess, but fixed
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post #8 of 8 Old 06-03-2010, 07:11 AM
Que89YJ
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1989 YJ Wrangler 
 
Join Date: Apr 2008
Location: Detroit
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Way 2 go! It was a compund problem. Worse yet it was a compund electrical problem. Worst of all it was a compund electrical problem on a YJ! It sounds like you have a good handle on electrical.
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