I have an 07 and the dealer installed a 4-pin trailer harnes, I had it hooked up tonight and the rear blinkers don't work with the headlights on. They work fine with them off just when something is hooked up to the harnes and fine when nothing is conected. and only when the head lights are on. Any ideas?

 

dealer installed it? Bring it back to them with the trailer and have them fix it.

 

I would love to bring it back to them but they are 2.5 hours away and the way the gas is i really don't want to take the drive if I can do something realy quick to fix it

 

Just go to your local trailer shop and get a T-One Connector and install it yourself. Easy hook up and no problem with all of the lights working...It will run you about 25 bucks and ties right in with your truck tail lights, Daisy chain style!

 

Ok,
I actually took it to a trailer shop and one of my pins in my trailer harness was reverse polarity. I got it fixed and the dealer is sending me a payment for the new one. Thanks for all the help.