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09-27-2002, 11:18 AM | #1 |
Registered User
Join Date: Sep 2000
Location: Kalispell, Montana
Posts: 136
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Basic Electrical Question
Hey guys, long time no post but truck projects moving forward, anyway a question.
I have known for months that I had some electrical gremlins in the lights of my '71, and after working on some trailer lights last night I think my problem is an improper ground. Normally my taillights have been very dim, and the turn signals occasionally don't work. Well I was working on the connection between my truck and camper and realized that when I externally grounded the truck trailer plug to the bumper or the camper frame, that the truck lights worked alot better and brighter. So I must have a ground problem, could this failing ground be at one location or mutiple locations in the truck? Thanks for any thoughts...
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71 C10 LWB Cheyenne 68 C10 SWB parts truck "http://www.cenlog.com/71chevy.htm" |
09-27-2002, 11:23 AM | #2 |
Gotta Startem Early
Join Date: Oct 2001
Location: Amarillo, TX, USA
Posts: 364
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Your trucks 30 years old. It is very possible the entire harness is going south.
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67 SWB In Progress, one piece at a time, maybe 3 years I will be finished |
09-27-2002, 03:17 PM | #3 |
Weapons Of Construction
Join Date: Apr 2000
Location: Colorado, USA
Posts: 1,095
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I'd say you have a ground problem. Grab a voltmeter, turn on the lights and measure between things that *should* be at the same potential, i.e., ground. If you measure between the frame and bed and get 2 volts, you have a problem. Run a ground wire using star washers under the ring terminals from the frame to the bed. Keep looking. Measure engine block to fender with it running. Anywhere you get voltage between things that should be ground, you need to tie them together with a ground strap.
Also, check your taillight housings vs the bed. In a truck that's 30 years old, rust can build up between surfaces and create ground problems.
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1971 GMC 2500, 402/TH400 4.10 Daily Driver Lafayette, CO |
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