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post #1 of (permalink) Old 09-01-2002, 01:56 PM
427jimmy
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Wierd electric problem

I've had a wierd electrical problem for a while on my 90 jimmy and I can't figure it out. When I put the brakes on the front and rear marker lights come on, the instrument cluster lights come on, and the headlight warning beep comes on. Makes no damn sense I checked for crossed wires behind the dash - nothing. I did find however not one but Two brake light switches. Both hooked up to thier own harnesses and the one that is just sitting in there has what appears to be a vacuum line coming off of it. Its just sitting up in there, not hooked to the pedal because there is no way It could be hooked up properly. Possibly the cruise control cut off?? Oh I must mention that I had a shop convert my jimmy from 4 speed auto to 4 speed manual. I was told by the shop that the cruise would not work with the manual. Funny thing is the power locks haven't worked since. This is some mess, any of you experienced guys have any ideas? Because me and the guys at the shop are dumbfounded and just don't know where to start
Thanks for your time
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post #2 of (permalink) Old 09-01-2002, 02:14 PM
 
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Re: Wierd electric problem

Do you happen to tow trailers? If so, do you have a t-adapter in your taillight wiring at the rear of the truck or one of those little plug in surge protectors back there? I had both in my old truck and they melted one day and when I pressed the brake everything came on just like yours. Also, pull out your taillights and make sure none of the contacts are melted and shorting.

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post #3 of (permalink) Old 09-01-2002, 06:54 PM
**DONOTDELETE**
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Re: Wierd electric problem

yeah i had that melting thing happen too, except in my case only the reverse lights on back came on everytime i braked, some acidic stuff built up in my plug [img]images/icons/crazy.gif[/img]. if you don't have one than have fun looking for it, try disconnecting the brake pedal switch, if everyting is fine that way then just build your own brake light system, (power supply, switch, and hookup to the brake lights), thats what i would do if i was in your situation. (wires what a PITA)
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post #4 of (permalink) Old 09-04-2002, 08:08 PM
Pete
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Re: Wierd electric problem

Jimmy
I had a similar problem with one of my trucks. When I hit the brake the instrument panel lites came on. It turned out to be the ground for the bed. I had checked it with an ohmmeter and it looked OK, but I got 12 volts from the frame to the bed when I hit the brake or turn signals. The 12 volts backfed thru the running lites and lit everything up. NONE of the 8 bolts holding the bed on gave me a ground! Strongly suggest a new ground wire. The other electrical problems may be related, but I doubt it.
Pete
post #5 of (permalink) Old 09-08-2002, 07:08 PM
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Re: Wierd electric problem

I'll second the ground idea. That's exactly what I was thinking.
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