2014 Sierra not getting trailer lights

[JLong26]

Hey guys, 

 

In need of some help. Got a 14 Sierra in the shop right now not getting any light to the Trailer. Brand new trailer (works fine on other trucks) 

 

Already checked and replaced 2 fuses under hood for trailer lights (14 and 15)

16 and 17 are still good.

 

Still no light to trailer... 

 

Any ideas? What should i check next? 

 

Thanks in advance!

[diyer2]

With blown fuses leads me to believe there was a short at some time.

Check trailer plug harness from back side of trailer plug forward to cab.

[Paintor]

If your hitch and trailer wiring harness was installed by Uhaul......crawl under there and fix the ground wire they attached poorly to the bed......put it to the frame.