head light switch makes cluster go crazy 90 yj - Pirate4x4.Com : 4x4 and Off-Road Forum

project_mud · 05-10-2012, 01:44 PM

1990 yj

My gauges go crazy when I turn on my head lights. Both my head light and dimmer switches have been taken apart and cleaned repacked with D grease.

I have been able to track it down to the middle contact in my head light switch that feed the dimmer switch. In the Manuel it labels as 72 18BL/RD. It goes to the dimmer switch as 90 18/pk/or and then turns into 52 180or/bk. I have traced it to the Gauge package circuit board connector. And cut it. The gauges still go crazy when I turn the head light on.

I then was wondering if power is back feeding from the dome circuit. I pulled the fuse. It reduces the amount of action on the gauges. But still screws them up.

I was going to try cutting the common ground 99 18BK? Wondering if power is back feeding in.

I have a feeling the issue has something to do with the dome circut. And my wipers dont work any more?

HAS ANYONE HAD A SIMMILAR PROBLEM? ANY SUGESTIONS?

Kole

89breaker · 05-11-2012, 10:23 PM

Define crazy.....in detail.

project_mud · 05-23-2012, 10:03 AM

when I turn on my head light it makes my cluster jump all over.
I have tried to cut the power to the cluster and it is still makeing the gauges have faulse reading.
I have to find a back feed of power. I think I have a ground that is back feeding power througt the cluster. It gets energized with the head light switch. There is a blue wire #72 I think that goes from hl switch to Dimmer switch. I have cut it and the spike still happens. I think I am going ot try to put a diod on the ground and see what happens.

I could do with knowing how to test the switchs and relays to trace the source of the problem.

Kole

beefdawg · 05-23-2012, 10:15 AM

This is usually cause by a bad ground. I had one once where the filament in the taillight bulb broke and was laying across the T/S filament and when I turned on the lights the indicator would come on. if the dash had a poor ground something like this would feed through the gauges. Try disconnecting or removing bulbs one at a time.

Hope this helps

89breaker · 05-23-2012, 07:57 PM

Buy a chilton's manual and verify all wires and connections are in good shape before anything.

Then get a voltmeter and start testing.

05-10-2012, 01:44 PM	#1 (permalink)
project_mud Registered User Join Date: Jun 2006 Member # 74368 Location: Allberta, Canada eh Posts: 322	head light switch makes cluster go crazy 90 yj 1990 yj My gauges go crazy when I turn on my head lights. Both my head light and dimmer switches have been taken apart and cleaned repacked with D grease. I have been able to track it down to the middle contact in my head light switch that feed the dimmer switch. In the Manuel it labels as 72 18BL/RD. It goes to the dimmer switch as 90 18/pk/or and then turns into 52 180or/bk. I have traced it to the Gauge package circuit board connector. And cut it. The gauges still go crazy when I turn the head light on. I then was wondering if power is back feeding from the dome circuit. I pulled the fuse. It reduces the amount of action on the gauges. But still screws them up. I was going to try cutting the common ground 99 18BK? Wondering if power is back feeding in. I have a feeling the issue has something to do with the dome circut. And my wipers dont work any more? HAS ANYONE HAD A SIMMILAR PROBLEM? ANY SUGESTIONS? Kole __________________ 1990 yj RENAGADE 5.7 TBI, SM465 NP241C wJB SYE HP Dana60 front D60 Rear w5.38 locked and loaded 39.5 IROKS on 17 bling bling

05-23-2012, 10:03 AM	#3 (permalink)
project_mud Registered User Join Date: Jun 2006 Member # 74368 Location: Allberta, Canada eh Posts: 322	when I turn on my head light it makes my cluster jump all over. I have tried to cut the power to the cluster and it is still makeing the gauges have faulse reading. I have to find a back feed of power. I think I have a ground that is back feeding power througt the cluster. It gets energized with the head light switch. There is a blue wire #72 I think that goes from hl switch to Dimmer switch. I have cut it and the spike still happens. I think I am going ot try to put a diod on the ground and see what happens. I could do with knowing how to test the switchs and relays to trace the source of the problem. Kole __________________ 1990 yj RENAGADE 5.7 TBI, SM465 NP241C wJB SYE HP Dana60 front D60 Rear w5.38 locked and loaded 39.5 IROKS on 17 bling bling

05-23-2012, 10:15 AM	#4 (permalink)
beefdawg vayacondios Join Date: Feb 2007 Member # 87698 Location: nor cal Posts: 1,274	This is usually cause by a bad ground. I had one once where the filament in the taillight bulb broke and was laying across the T/S filament and when I turned on the lights the indicator would come on. if the dash had a poor ground something like this would feed through the gauges. Try disconnecting or removing bulbs one at a time. Hope this helps __________________ ---- 80 cjunk7, with stuff--SOLD new build... 90 yjunk, longer, wider, more stuff, fasten your seat belt, it makes it harder for the aliens to suck you out of your rig ---- NRA LIFE MEMBER ----

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05-11-2012, 10:23 PM	#2 (permalink)
89breaker Registered User Join Date: Dec 2005 Member # 64213 Location: En el mundo Posts: 1,767	Define crazy.....in detail.

05-23-2012, 07:57 PM	#5 (permalink)
89breaker Registered User Join Date: Dec 2005 Member # 64213 Location: En el mundo Posts: 1,767	Buy a chilton's manual and verify all wires and connections are in good shape before anything. Then get a voltmeter and start testing.