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#1
08-12-2006, 07:20 AM
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Trailer lights problem
I installed a trailer light harness adapter into my 91 Caprice. I grounded the wire in the trunk on the left side bracket where the trunk lid arm attaches as there was already a ground there for something else. When I connect the trailer lights I only have one weak lamp and no signals. I also installed a HD electronic flasher. Is there a problem with grounding in the trunk or have I missed something? Thanks.
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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis single rear wheel pick-up truck) 1968 Pontiac Parisienne (rust free survivor) 1973 Buick Centurion (four door hardtop; engine will be donated to our 1949 1 ton truck) 1989 Chevrolet K3500 RC/LB (454 & single rear wheels) 1991 Chevrolet Caprice Classic (police cruiser clone) 1992 Chevrolet K2500 EC/SB (almost rust free daily driver) 1998 GMC C1500 EC/SB 
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#2
08-12-2006, 08:04 AM
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Re: Trailer lights problem
I would think that would work. I put a cd changer in my 86's trunk and grounded it in the same place I think you talking about. I did have to scrap the paint there down to bare metal to get a good ground. You might try that to insure you're getting a good ground there.
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CD 1991 W41 #142 1989 Caprice 9C1 1997 C1500 1997 Bonnie SE 1998 Olds 98 LS Recently updated: http://forums.b-body.org
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#3
08-12-2006, 07:04 PM
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Re: Trailer lights problem
As far a only having one weak lamp, I'm not quiet sure (there must be a spot in your circuit with a higher than normal resistance resulting in less than adequate voltage across the light, whether that is a bad ground or faulty wiring I'm not sure). Do the lights share the same ground? If so, then that would seem to indicate a decent ground and point to wiring to the individual light being suspect.
As far as no signals, your flasher relay is designed for a certain resistance across it and the lights in series with it (the lights are in parallel with each other but in series with the flasher). Check out the following link: http://knology.net/~rkmason/flashers.htm By adding or removing lights in parallel (adding trailer lights), you can change the resistance and thus the voltage drop across the flasher and lights, altering operation (unless your flasher is designed for that voltage). You said you installed a HD (heavy duty) flasher, but is it designed for a trailer lights? Hope this helps.
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#4
09-04-2006, 07:48 PM
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Re: Trailer lights problem
After much fiddling around and grounding everything in sight, I found the problem was the connection point for the adapter harness. The instructions showed the connection to be at the trunk lid hinge; and there is one there, and I connected to that one, but that was the problem, there's another connector further back near the back left corner. That was the correct connector. Now everything works fine, finally!! Thanks for the help and suggestions.
BTW, the flasher (Tridon, but don't know the model) is good for up to 12 lamps and can be used for signal or emergency lamps.
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1949 Chevrolet 1433 (Canadian 1 ton cab and chassis single rear wheel pick-up truck) 1968 Pontiac Parisienne (rust free survivor) 1973 Buick Centurion (four door hardtop; engine will be donated to our 1949 1 ton truck) 1989 Chevrolet K3500 RC/LB (454 & single rear wheels) 1991 Chevrolet Caprice Classic (police cruiser clone) 1992 Chevrolet K2500 EC/SB (almost rust free daily driver) 1998 GMC C1500 EC/SB
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