Question about 1999 Buick Regal

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Having a hard time wiring a replacement taillight in 1999 Regal

The back end of my car was hit by a plow and I'm trying to make it street legal by replacing the one light that was smashed up bad (rear L turn signal). I bought a stand-alone turn signal from Wal-Mart with two wires (red and black) coming off of it. The wiring harness to my car's original taillight had three wires (black, green, brown with white stripe). I have no clue how to wire this up because I can't figure out what color is what (I assume one is the ground). Originally the new turn signal worked except was blinking fast as it normall would if one of my turn signals on that side was dead. Then I rewired it at which point it was blinking at the appropriate speed, however when I got back into my car I noticed all of the lights on my dash were dimming in sync with the blinker. I'm sure I have the wiring wrong or I'm not finding a good ground or something. The other thing is that there are two more wires that came out of the harness that originally went to a small running light (black and brown with white stripe). I didn't hook those up at all because I wasn't going to try to replace that small corner light. Would these symptoms be caused by having those wires not hooked up to anything at all? Any help would be much appreciated

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  • kjduncan Jan 12, 2009

    Okay I kind of understand what what you're saying I think. I'll wire the black wire from the car into the black wire of the light I bought and then run the red wire from the other end of the light to some place to ground it on the frame? I don't have a test light (I've read about them on the net since I've been trying to fix this), so I'm just doing it with the light I have. I'm not sure that the wires with lines on them are tied in for trailer lighting however, because these are the wires that were originally tied directly into the sockets that I put my turn signal bulbs into. When I disassembled it today however I was surprised to see that there were three wires coming from my car and only two on the lamp. With the configuration where my interior lights dimmed I was able to get both a blinker and brake light response out of it (although I don't think I tested both of them together which is what I think you're getting at with the double element bulb thing). Would you expect there to be three wires on the aftermarket light I bought if it was a double-element bulb? I've never delt with this before so I just picked up this generic light at the store the other day.



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The Light has SOMEWHAT 3 Wires The EXTRA IS The Mounting Bracket IT IS The GROUND now thet light to see white or brown is TAIL Light or Turn GM's Usualy USE BROWN as TAIL LIGHT that would Make the Only WIRE Left as Turn may not need to GROUND New Light to BODY the Black ic a Body Ground ALREADY GROUNDED Good LUCK

Posted on Jan 16, 2009

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You should just be able to find a hot wire 12v most likely the black wire, the ones with stripes are most likely tied in for trailoring lights. If there are only two wires 1 wire can go to a bolt or other bare metal to ground. You have a test light in the light itself, wire the 1 wire to a good ground and with the other end of the light wire touch to black wire with the appropriate turn signal on and when the light blinks in correct rhythem than viola, you have the correct wire. Direct current operates thru the light it doesn't have to be hooked up to alternate back to the power source like A/C. You could dissasemble the good/other turn signal and see which wire goes where, but with double element bulbs it is a 50/50 chance on which one is the turn lamp or the brke lamp. good luck.

Posted on Jan 11, 2009


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