Hi, new to the 6.0. Have a 2006 F250 King Ranch Short Bed 4x4. I have an issue with my tail lights and brake lights. When I turn running lights on and then use blinker both sides flash, then when pressing brake running lights go off as well as brake lights. Front works fine just the rear. I cleaned three grounds in engine bay and replaced cab to frame ground cable. I tried different tail lights as these are led, new turn signal switch. Looking for suggestions on what else to do. It was an aftermarket older Kenwood radio and the screen goes out when pressing brake or using blinkers. Not audio just the screen. Getting some kind of feedback. Wondering if anyone else has encountered this issue or has some insight for me. Thanks

 

The ground for the lights at the rear is on the driver’s frame rail a bit forward of the rear bumper.

 

Alright sounds good thanks.

 

G400