Question about 2005 Chevrolet Colorado

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Have a 2005 chevy colorado, i installed a four way harness exactly how the directions say, but when i connect the trailor only the right and left turn signal and taillights work. No break lights.

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Depending on how you installed the 4 way harness, you might need a convertor box. colorados have seperate turn/brake light bulbs.

Posted on May 27, 2009

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On the truck, are the turn signals and the brake lights using the same bulb, if the brake lights are using a different bulb the trailer might not work withe the truck if it only has a 4 wire plug, might have to add brake lights to the trailer and use a 5 wire plug, yes this means rewiring the trailer and adding lights

Posted on May 17, 2009

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the best thing to do is get a 12 volt lite tester the one with the pointie end. cut your harness turn on left turn signel. with tester lite grounded tuch the ends of the cut wire from truck strip a small piece of wire covering and attach to your trailor harness when left signal works on the trailor do the right blinker the same way as for running lites turn on your park lites and see witch two wires are lit connect to trailor making shure lites are dim last wire are for brake lites now you well know where to connect to new harness good luck cj

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You didn't list your engine size so please pick the applicable to your motor size:

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