2006 GMC Sierra 2500HD 4WD trailer light connection fuse blown?
Were is the fuse location for the tralier lights. I looked in the fuse box next to the drivers door but could not find any labeled trailer lights, and searched but could not find any blown fuses. The lights on the truck work O.K. just don't measure any volts at the connector by the trailer hitch with my volt meter. This did work yesterday, but the lights were shorted on the trailer today when I attached the plug.
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Suspect 7 pin connector problem , you should have power on the 8pm positioned and the centre pin position as you look into the socket (on vehicle. These pins are both male pins as you look at them . If ok check trailer wiring where it splits for either lamp assy ! Good luck
There is a 4wd module which should be located above the glove box area. Listen for a click while shifting into 4wd from that box. If no click, look there first. Also look at the multi-pin connector on the transfer case. They are very small pins which will, if bent, wont sit properly.
Strange as it might seem, I had a similar problem with my 2003 Sierra 2500HD. All lights on the truck worked fine, and all lights on the trailer worked fine with the exception of the right brake light. I chased all the obvious possible reasons, (blown fuse, shorted wiring, etc). It turned out to be a sticky relay in the flasher unit in the dash. It is located behind the fuse panel on the left side of the dash, and is accessed through a hole behind the lower panel under the steering column. I removed the fuse panel cover and the lower plastic panel under the steering wheel and was able to remove the flasher unit. I ordered a new one but before I installed, it I checked the old one. The plastic cover comes off easily. There are two small relays for the trailer lights and the one for the right side was stuck in the off position. I freed it up, using a toothpick, gave it a spray of conatact cleaner and re-installed it. It is working fine now. I kept the new flasher unit as a spare in case the problem arises again.
Your problem may not be the same as mine, but at least you will know where the $100.00 flasher is located!