Question about 1993 GMC Suburban

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93 GMC Suburban, No Tail Lights

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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  • Mike Butler
    Mike Butler May 11, 2010

    Was all this working before trailer plugged into it?

  • Anonymous Mar 13, 2014

    I have after maket tail light lenses on my 93 suburban the break lights and turn signal keep going out but the tail lights stay on i changed bulbs and the boards in tail light and fuse are good need help fast pls

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  • Contributor
  • 13 Answers

Check the trailer plug ground first. If in doubt. Ground in another location. Make sure the area is free of rust and the ground is tight.

Posted on Jun 28, 2009

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The left tail light on my trailer doesnt work.the stop and turn signal works . is there a fuse for it? i have 2011 gmc sierra 1500


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).

Oct 09, 2016 | 2011 GMC Sierra 1500

Tip

Trailer Wiring Cheat Sheet


Hello all,

For those of you that have or occasionally borrow trailers and look at the wiring plugs with disdain (I mean face it they don't make sense, ground is white, +12vdc is black, etc), this is for you.

The following are the accepted standards for different trailer types.
The different plugs and connectors used are marked with either a number or letters. Having the functions of each in advance can save a lot of trial and error when troubleshooting..

Plug Types/Application
7 Way - RV Trailers, Horse and Utility Trailers
6 Way - Horse, Stock and Utility
4 Way - Utility Trailers

Columns are: Color, Function, Mark on the plug.

Seven wire Trailer plugs:

Horse, stock or utility trailers:

White = Ground - 1
Blue = Electric Brakes - 2
Brown = Tail and clearance lights - 3
Black = Battery, aux power - 4
Yellow = Left turn/Brake - 5
Green = Right turn Brake - 6
Orange or Purple (not both) = Auxilliary or Reverse - 7

Recreational Vehicle:
White = Ground - 1
Blue = Electric Brakes - 2
Green = Tail and clearance lights - 3
Black = Battery, aux power - 4
Red = Left turn/Brake - 5
Brown = Right turn Brake - 6
Yellow = Auxilliary or Reverse - 7


Six wire trailer plugs:

Horse, stock or utility trailers:
White = Ground - GD
Yellow = Left turn/Brake -LT
Green = Right turn Brake -RT
Brown = Tail and clearance lights - TM
Red or Black (not both) = Battery, aux power - A
Blue = Electric Brakes - S

Recreational Vehicle: (color, use, plug mark)
White = Ground - GD
Brown = Right turn Brake - RT
Green = Tail and clearance lights -TM
Black = Battery, aux power - A
Red = Left turn/Brake - LT
Blue = Electric Brakes - S


Four wire plugs:
White = Ground
Yellow = Left turn/Brake
Green = Right turn Brake
Brown = Tail and clearance lights


Ground should be 10ga.
Others 14 ga

Best regards
Mike

on Dec 25, 2009 | GMC Blazer Cars & Trucks

1 Answer

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check the wires in both trailer connections
check that the beep is not from a reversing alarm that is mis-wired in the plug and trailer connection

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check the light checking unit power for light go through this to the bulbs tell you when a bulb is out. center light is not on this circuit.

Feb 03, 2014 | Cars & Trucks

1 Answer

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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.

Your trailer plug should mirror this.

This is the standard.

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1 Answer

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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 allactionmaintenance@gmail.com

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sounds like a ground problem on the trailer

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1 Answer

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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.

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1 Answer

1993 GMC Sierra 4x4, no brake lights, no rear running lights


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.

Dec 15, 2008 | 1993 GMC Sierra K1500

1 Answer

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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.

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