PGamboa,
Please assist. I own a 2015 Silverado 1500 LTZ Z71 with the 6.2L engine. I recently installed some tow mirrors and the clearance lights do not function at all. The lights do not turn on with the cargo lamp on or even in reverse. I was told I may need some additional wiring to ensure this works. I heard you are the man with the plan. Anything would help.