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Old 06-10-2003, 10:37 PM   #1
turmoline
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eclectrical ?

Got an electrical ? for you guys. Brake lights work fine along with the rear turn signals with the headlights off. As soon as I turn the headlights on boom no brake lights and when I turn on a signal say the left one, it goes on but does not blink.
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Old 06-11-2003, 12:36 AM   #2
71GMC_3/4T
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Check your ground wires from your bed to your frame. They should be up under the bed, just ahead of the rear tires. If they are there, check the turn signal housings, they should be grounded by the mounting hardware.
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Old 06-11-2003, 09:59 PM   #3
turmoline
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I was thinking ground. I just have some makeshift lights on the frame (no bed installed) They are trailer lights. Am going to put the bed on soon. I'll check the ground install then. Thanks for the heads up. Mark
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Old 06-12-2003, 12:20 PM   #4
adkphoto
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Lightbulb

I have something almost exactly the same going on. Checked all the wires and they look fine. Replaced brake light switch and blinkers.... still no good.

Tore apart the sterring column to check the condition of the signal light switch....the amount of grease and dirt in there would be enough to kill any piece of electrical equipment. Fiddling with the switch would make certain lights work intermittently.

Needless to say, I ordered a new signal light switch and cleaned up the inside of the column. (haven't installed it yet so I don't know if that solves all of my problems)

New part is $40 from GMC Paul's

David
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Old 06-12-2003, 11:39 PM   #5
turmoline
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adkphoto. yah I haven't been able to spend a whole lot of time fooling with it yet. My column is brand new and all the wiring to the backs are new as well. I'll probably start with the ground and go from there. keep me posted on how you make out. CAn't rule anything out at this point.
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Old 06-13-2003, 07:09 AM   #6
Jwill41
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dimmer switch can cause similiar problems. I have had to replace on both my trucks.
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Old 06-13-2003, 11:51 AM   #7
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I've seen a bad bulb do similar problems, but it was in a much newer car.
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Old 06-13-2003, 01:00 PM   #8
1967K10
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I also had a similar problem that ended up being a bad ground to the dash. I ran a ground wire directly (which fixed it) to it after much frustration and failed attempts to find the problem. My dad is a whiz with electrical, he used a multi-meter and the dimmer switch for the dash to determine it was a ground problem.
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Old 06-13-2003, 07:22 PM   #9
turmoline
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how did you end up running the dash ground. I looked under the dash and saw that it was grounded but couldn't tell where it went as it went into the harness. Thanks
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Old 06-13-2003, 09:16 PM   #10
1967K10
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I ended up running it to the back top of the dash near the radio. There was a small bolt and a nut there to which I connected.

If you want I will call my dad and ask him how he trouble shot the ground with his multi-meter. Send me a PM or e-mail me.
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Old 06-14-2003, 12:42 AM   #11
turmoline
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I've got some clip grounds that I can use to try to troubleshoot. I'll fool with that and get back with you. Thanks.
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