tahoe05

I am having problems with the wire harness on my Tahoe. My trailer lights are not working. they worked last week, but not today. the brake and turn signals are working.
I bought a tester and it confirmed what i thought the brown wire is not working which is the running/tail lighta. Is there any way to easily fix this. I also checked all the fuses on the door? i know there is a box near the pedals would there be a fuse in there?? or do i need to bring this back to the dealer?
The car came with the tow package.
thanks for your help
Matt

kcb37

Check and make sure the connections are tight, and clean, on my cargo trailer with my Silverado I have to play with the plug a little, (I have been meaning to replace it).
But it should be white ground, green right turn and brake, yellow left turn and brake, and brown taillight.