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Chevrolet Silverado 3500 HD
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2007 Chevy Silverado 3500 HD - driver side rear - turn signal and brake light do not work. Running lights and reverse light works. Everything on the right side works fine. Turn signal on driver front works fine.

Switched out fuse, full wiring harness and bulbs to no avail. Any other suggestions?
 

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2009 5.3l 6l80
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4,978 Posts
What about the switch itself on the column? Usually both front and back and the indicator light wont come on if its the switch, I think, but worth checking.
 

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There is a distribution panel in the wiring harness attached to the frame close to the left taillight. This panel has 4 wiring harness's plugged into it, one from the dashboard, and one to each tail light and the trailer hitch. If you live where there is snow and salt, it it probably corroded. You may be able to diagnose this by testing to see if all the lights function correctly at the trailer connector.
 

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The truck is currently at the dealership. They have so far determined that the harness for the headlights and directional is bad. They also said it might need a new BCM, but don't know yet. 3 hours to diagnose the problem is their guess. I'm thinking this will be a $1,000. fix.
 

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Okay, just got home from the dealer. Cost of repair $591. Harness was bad, BCM is good. The wire coming from the fuse box to the BCM was bad. I could have a new fuse box put it but I can do that myself one day. They bypassed the bad connection and said I still have an inline fuse that will protect the circuit. It was my choice to do the bypass.
 
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