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Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
Hello, I need help from this group. I have been chasing electrical and ground problems on my 1966 1001 Stepside GMC pickup. I finally got my rear taillamp/turnsignals/brake lights working by determining that there was not a good connection between the frame and chassis where the taillight assemblies mount.
Now my attention is on the front park lamp/turn signals which are not working. Question: Where/how do the front park lamp turn signals get their ground from? Also, I have noticed that the dome light inside the cab will not come on either. One more thing I just noticed is that when I turn on the ignition switch to start the truck my rear taillight/turn signals stop working while the truck is running. They work perfectly fine in the AC mode of the ignition switch but not after I start the truck. All four head lights work in both Hi-beam and Lo-beam even with the truck running. Need help chasing these electrical gremlins. Anybody that wants to help me via email may contact me at my personal email: Thank you DAVID L. ESQUIBEL email: EsquibDL@comcast.net |
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
If you're not getting rear lights after starting the truck, you didnt fix it. You should have lights all the time when the key is on. How did you "fix" the rear light grounding issue? Any pictures?
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
First thing you should have is a wiring manual for your truck, before any electrical troubleshooting can be performed.
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This sound more like a bad ignition switch. It should operate in run and ACC position. |
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
Email sent
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#5
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
I used a ground strap and bolted it between the frame and the rear chassis where the turn signal/tail lights get mounted.
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#6
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
Got all external lights working. Headlights work - both lo-beam and hi-beam, park lamp/front turn signals work. Tail lamp/turn signal/brake lights work. Turned out to be bad grounds in the front between hood and battery/chassis ground. In the back, bad ground between truck frame and truck box where tail lights mount.
Still can't get the dome light to work. Bulb checks good, dome housing has power on one side of the bulb, and I can bypass the light switch across the bulb by jumping that side to ground and see that the bulb lights up. Any ideas here? The rest of the light switch is working fine, just the dome light is not coming on with the switch. |
#7
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
Got all external lights working. Headlights work - both lo-beam and hi-beam, park lamp/front turn signals work. Tail lamp/turn signal/brake lights work. Turned out to be bad grounds in the front between hood and battery/chassis ground. In the back, bad ground between truck frame and truck box where tail lights mount.
Still can't get the dome light to work. Bulb checks good, dome housing has power on one side of the bulb, and I can bypass the light switch across the bulb by jumping that side to ground and see that the bulb lights up. Any ideas here? The rest of the light switch is working fine, just the dome light is not coming on with the switch. |
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
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Hope this help. James |
#9
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
That is an excellent idea. How do I locate the dome light wire at the head light switch. Does anybody have a pinout of the 66 GMC headlight switch? It would be nice to know where the dome light plugs into the headlight switch for power and ground connections.
I have removed the head light switch from the dash mounting hole and it is now just dangling there, does that mean that it no longer has a good ground connection? Since I have removed it from the chassis ground? |
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Re: Need help with my front park lamps/turn signals. I have a 1966 1001 GMC.
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Once the switch is removed from the dash there is no ground available. If you have a jumper lead, you can connect one end to the switch and the other end to a known good ground. Then operate the switch to the dome light position and it should come on. Last edited by James; October 23rd, 2023 at 02:42 PM. |
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