do you have a trailer light converter installed for towing? when they go bad, weird things can happen. when your headlights are on, so are your running/parking lights which share harness wiring with brake, turn and reverse bulbs
I have a 1 1/4 inch receiver hitch. I'm pretty sure I do not have a trailer wiring harness I didn't see one the only time I've ever towed with my 4Runner. Depending on how my work schedule looks at the end of the week I may pull the truck in the shop bust out my voltage meter and track it all down. Thank you guys for the ideas
