RR tail light is out(purple/orange wire). FR hyper blinks. turn truck on - no outage light, pres brake or hazards or right turn signal get the outage message. i believe the SJB checks resistance in the line. then displays error message, but does it stop sending power to the circuit if it senses the issue? replaced bulb - RR still out. checked fuse - 10amp fuse does all brakes and etc switched the bulb with its outlet to RL - it works on the RL but RR still out. i also popped the positive terminal off for 20 minutes and reattached - RR still out. checked for power with multi-meter getting power to the RR running light but nothing to the RR brake/turn light. so i know the ground (black/yellow) is good. so it appears to be the purple/orange positive wire is having a ground issue. this happened intermittently now its full time. can someone tell me how i can track down the grounding issue(harness connections) or is there a way to check the SJB for a issue? although i dont think there is an issue with the SJB because the fuse would prevent that and the SJB would throw the check RR signal error immediately. i didnt check for power at the trailer harness connector ( anyone have diagram of connector assuming its also not a purple-orange wire) i know this purple-orange wire is in the wiring harness in the driver rocker/kick panel area. as i believe the SJB is right there behind the internal fuse box, i guess i could check capacitance from that area to the RR bulb socket and that will tell me if its between the two.