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Old 06-13-2010, 07:33 AM
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Break Light Issue

I have a brake light problem. The brake lights and the turn indicators all work fine when the lights are off. However, with the head lights on, the brake lights do not work at all.

This truck was rewired before I purchased it, so it has an aftermarket wiring harness in it and the original light switch is gone (been replaced with a typical two position switch). I suspect there is a wiring issue, anyone have any pointers or lessons learned?


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Old 06-13-2010, 07:50 AM
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Most likely a ground issue.....Check all your grounds, especially the ones at the light sockets and headlight connections.
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Old 06-13-2010, 09:47 AM
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whats a tipical 2 pos sw ??

if its the normal turn sig sw..?? then u really need to look into the wiring of the sw.. everything will pass through that sw. i hate those sw's so i just added a small set of amber sig lites and us a two position toggle sw... by-passing all that stuff.
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Old 06-14-2010, 12:18 AM
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brake lights and tail lights are 2 different wires but share same ground. your switch is out of the equation. Being both sides are effected, look for their common ground.
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