Brake/turn signal help 06 silverado 4.8 crew cab

[Matt06silverado]

Braketurn signal help.docx

[Matt06silverado]

When i use my right turn signal both reverse lamps blink as wella s the third brake light. So far i have replaced the tail light circuit and the blinker module neither helped. It looks like the tail light harness have been replaced on both sides. Could the wrong harness cause this? 

[David89GMC]

Of course the harnesses could be the problem. Get the correct harnesses.

 

Thanks for typing out the problem. Nobody opens unknown attachments anymore.