The tail lights on my 08 Yukon are acting very weird. I have zero brake, running or reverse lights but the blinkers work when not stepping on the brake. As soon as I step on the brake I get the "tweaker blinker" and again nothing on either side of the tail lights works. Ive checked fuses, bulbs and put a meter on each light separately and I have power to everything. Any suggestions? I also bought this used and searched the vin for problems and got nothing.

Does your Yukon have a pigtail for trailer lights? If so you might look there especially if it'* not factory and the PO wired it in.

2004 Bonne SLE
1971 Chevelle SS

I haven't looked there but I will definitely look into it. We've had it a month and everything was fine and a week ago this all started.