GMC Troubleshooting Questions? Ask a Mechanic for Answers
Here is the thing. The front flashers work fine. I can hear the 4 way relay
working. Right and left front flashing. The turn signals, front and rear are working. How can the rear flashers not work. They are on the same wire as the turn signals.
No after markst installed. I checked the flasher before I contacted you.
check the flasher is no help.
I did find the tail light wire are connected to a trailer option wire Run on the drivers side ,connection behind the door.