I have a 93 GMC Suburban 1500, It is wired for trailer, with a T Connection for the tail lights and trailer plug. The problem I have is that there is no tail lights, no dashboard, and no turn signal also no back up light. I have ck the fuses, in the turn signal fuse, it blows everytime I put a new one in. I have replace the turn signal flasher, but I am stuck on to where to go now.
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There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).
It sounds as though you have either a frayed wire between the brake control circuit and tail/running light circuit of the truck side of the plug, or someone wired the truck side of the plug incorrectly.
Think about it. The parking brake lights come on when the controller is activated. More than likely the tail lights are also.
The tail lights are also going to come on when the headlights are on. This would cause the trailer brakes to be activated IF there is a short in the TRUCK side of the plug itself.
That's where I would personally start investigating, The truck side of the trailer plug.
If you're only blowing the fuse while the trailer is plugged in, the problem is in the trailer/wiring. This takes into account that the truck has a factory installed 7 way receptacle. If that's not the case, the problem can be in the incorrectly wired truck and the trailer is ok.
On the truck, looking into the 7 way receptacle should be as follows. Top left=Tail Lights Top right=12v steady source/charge line Left middle=Left turn/brake Right middle=Right turn/brake Left bottom=ground Right bottom=brake controller output Center=reverse lights if your trailer is equipped.
check fuses also is it manufacture installed or after market installed. if manufacture installed check connections behind the connector. if after market installed check where they spliced wires into the tail light wires behind bumper and any where else that wires could be connected do you have tail lights and brake lights on the suburban send email to email@example.com
You most likely have a bare wire under the truck at the rear where gravel stones can hit, that is shorting out on the frame or another wire. If you have an aftermarket trailer plug, that's the first place to look.
If you still have this problem maybe this will help. I had to replace the trailer plug on a 93 GMC Sierra K1500 and had a problem with the light's not working. Had to trace wires from trailer plug up to tail lights. The problem was a broken ground wire. It took longer to remove all the tape and replace it than fixing the problem.
I have this same problem with my truck. The U haul guys and I tried and tested every scenario, leaving out hard wiring behind the plug (where the adapter goes). I haven't tried it as I don't ever pull anything, however it can't to too hard to do.