Question about 2000 GMC Sierra

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Trailer Brake Light Problem

The trailer brake lights stopped working.  There is no current to the plug on the factory installed trailer plug.  The turn signals work and they are on the same prong in the plug (yellow wire).  Tried swapping out the brake controller but didn't solve the problem.  Also checked all fuses. Any ideas what to check next?

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  • Anonymous Mar 31, 2014

    what size fuse to use for electric trailer brakes and brake controller

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  • 298 Answers

Try checking all the snap in connectors on the back side of the plug,
some times they get loose and/or corded.
if those are good you may have to run a wire trace. i'm not sure how much that would be, i charge 50.00 normally depending on the vehicle.

Posted on Aug 30, 2008

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1 Answer

Low voltage at right brake/turn signal trailer hookup


Low voltage would mean that there is corrosion further up the circuit. Corrosion equals resistance. Resistance equals voltage drop. Keep searching the wiring and connection further up. You're bound to find some green fuzzy corrosion at some point

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Lost my brake and turns on my trailer plug checked fuse and wire harness back still nothing is there a relay besides under hood or something else to check


You will need to check voltages throughout the system to determine where voltage is lost. If you have 12V on the brake light circuit at the plug but no brake light on the trailer, there is a problem with the trailer wiring. If you do not read 12V on the trailer plug on the brake light circuit but you have working brake lights on the vehicle, there is a problem with the brake plug wiring on the vehicle.
DOES YOUR VEHICLE HAVE A SEPARATE REAR BLINKER CIRCUIT AND BRAKE LIGHT CIRCUIT? If so, you will need to purchase an adapter in order to use a standard trailer plug.

May 22, 2015 | Cars & Trucks

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2004 Chevy Express 1500 keeps blowing trailer light fuse


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

Trailer - brake lights don't work on one trailer - work fine on other....


You have to many bulbs running for the size wire you can get into a 7 pin plug. You will have to up grade to a heavy vehicle plug which is around 2" in dia.. Next the stop light draw 25 watts each so if you have 3 trailers that ia 6 x25 watts x12 volts will indicate how many amps you are pulling when the brakes come on. Next you can change the wiring so that each bulb is connected in parallel not series that is the first 2 lights have one wire the 2nd bulbs will have a different wire out of the same pin and so on for the rest of the trailers. So what you will have will be say for 3 trailers the trailer plug will have wire to the first trailer and out of the same pin will be another wire that will go to the socket for the second trailer and so on That way the wire carrying the load will be the vehicle wire that you should have relayed any way. So you have a big current wire to the relay that is connected to the power pin of the socket. The relay is activated by the stop light wire to earth. This closes the relay and the heavy wire conducts current directly to the stop light pin of the first trailer and is piggy backed to the second socket and so on.. IN the end you will have only 2 bulbs working on each wire and not a multiple of bulbs drawing current on the one wire

Jul 28, 2013 | Ford F-250 Cars & Trucks

1 Answer

Have a 1994 Dodge Ram 1500 4x4 1500 with wiring problems. The original problem was a brake light out on the drivers side. I changed the tail light plugs. With head lights off I had brake lights with head...


Your truck may have had the factory trailer tow package, but that did not come with a wiring connector in that year. There should be a wire harness under the rear of the truck near the center of the bumper with 7 wires of the following colors/characteristics -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Tail Markers (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
Violet/Black - Backup Lights (Thin Wire)
Dark Green/Red - Left Stop/Turn - (Thin Wire)
Brown/Red - Right Stop/Turn - (Thin Wire)
Black - Ground - (Thick Wire)



Under the dash, the brake controller wiring should be -

Red/Orange - +12V Battery (Thick Wire) From fuse #8 (40A)
Black/Orange - Ground - (Thick Wire)
Light Blue - Trailer Brakes (Thick Wire)
White/Tan - Brake Light sense - (Thin Wire)

Hope this helps.

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1 Answer

2009 Silverado 4x4 pickup with towing package and factory installed Trailer Brake controler installed at factory. The system has worked in past. I had my Stock trailer rewired and things tested out fine...


It sounds like you lost a ground.
check traier hookup first.
Probably not the controller.
P.S. There are multiple fuses for this setup. check all ! ! !

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4 Answers

No trailer right turn signal or brake light


Hey Boon,

The pinouts for a 7-way plug are as follows:
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

In both cases 4 is battery and 7 is reverse, aux or not used.

Double check your wiring using these lists as a reference.

Click here for my post on Trailer wiring

This should get us closer to the answer.

Best regards,
Mike

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2 Answers

Trailer hitch...no running lights (2004)


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1 Answer

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I found the problem. Talking with a technician from the controller company, we determined that it was a fuse problem. I found that the fuse to the CHMSL was blown.


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