Rep: 13
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The rear running lights do not work on my 94 GMC Sierra . My turn signals and hazards are fine. and brake lights work when I hit pedal , but my tail lights that stay lit while driving do not work and I have changed the bulbs already and no fuse is blown. Any suggestions?
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Rep: 3k
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If fuses and bulbs are fine then check the switch. Make sure that it is supplying the running lights with power when selected. If not, and you've got power coming into the switch, then you need a new one. If it IS sending power to the lights, then you'll need to trace the wires back and make sure they aren't broken. If the power wires aren't broken and you're getting power to the lights, then you'll need to chase down the ground.
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