Question about 2000 GMC Sierra

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Trailer brakes lights dont work on my 2001 gmc 2500hd

I have both turn signals on my 7-way plug but I have no brake lights. I follower the harness back to the cab and could not find a problem. Please help

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Do you have brake lights on truck? Is this a new hook-up or has it been hooked up before & worked fine? If your brake lights on truck are one color (red) and your turn signals are another (amber) you will need to buy & connect a small converter that goes in harness to plug in order to separate the 2. Instructions with converter are pretty simple.

Posted on Jul 20, 2009

  • Mike Butler
    Mike Butler Jul 20, 2009

    Most autoparts stores & all RV places should have the converter.

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2006 Ford Expedition left trailer brake/turn light not working.


if there is a power problem then the corresponding lights of the vehicle will out as well. If they work check where the harness is plugged in and check the connection.

Mar 02, 2015 | Ford Cars & Trucks

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When I tow with my car the left blinker doesn't work on the trailer. There is a 7 pin round plug on the car, with a flat adapter to the flat pin on the trailer. I have had the same problem with at...


Hello Carol, The 7 way is for use with a brake controller and/or a trailer that has electric brakes. The 4 way flat is a basic trailer plug connector.
Connect as follows:
Green wire- Connects to the vehicles right turn wire harness & provides brake light and right turn signal on trailer.

Yellow wire- Connects to vehicles left turn wire & powers brake light & Left turn signal on trailer

White wire- Ground

Brown Wire- Tail/ marker/ license plate lights

The Blue, Red & Purple wires on the 7 way will not be used on the adapter, those are for brakes.

I hope this information is helpful.

mr_brokrench_4.jpg

Sep 18, 2011 | Honda Accord Cars & Trucks

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I have a 2004 GMC Sierra 2500HD and ever since ive had the truck ive had trailer light problems. The problem I have is I dont have running lights and the right side brake and turn signal do not work. I...


Check the plug wiring again on the truck. You have a wire crossed , when you hit the lights and it only blows with the trailer, then there is a crossed wire on the truck. What seems to be happening is your sending power to the ground for the trailer. You can check the trailers ground with an ohm meter, then make sure your truck ground matches that pin. You may know this , but green rght turn, yellow is left turn, brown is parking lights, black is brake lights, and white is ground.

Aug 05, 2011 | GMC Sierra 2500HD Cars & Trucks

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Have issues with trailer lights. Both turn signals on trailer flash when I use left or right turn signal. Have 7 pin factory plug. Lights on trailer work fine, hooked up to 97 Silverado. Act funny on 2000...


Standard wiring colors are as follows:

4-Way

5-Way

6-Way

7-Way

Green

Yellow

Brown

White

Red

Blue

Purple

Right Turn & Brake

Left Turn & Brake

Tail Lights

Ground

Backup Lights

Electric Brakes

Auxiliary Power
Green- Right Turn and Brake
Yellow- Left Turn and Brake
Brown- Tail Lights
White- Ground
Red- Reverse (Back Up) Lights
Blue- Electric Brakes
Purple- Auxiliary Power

It sounds like your green and yello wires are shorted together somewhere along the length of the harness. I would check the wires on the trailer first. Easier yet, if you have another trailer to connec or access to another to use for testing, connect to it and see if the problem repeats; if it does the trouble is in the vehicle's wiring.

Jun 26, 2011 | 2001 GMC Jimmy

1 Answer

2001 2500hd silverado no stop lights at trailer connection (7 pin) turn signals work fine and no problems with truck itself (fuses are ok and the brake pedal switch is operating ok


How have you tested this? If you are just looking for the stop or brake light, you need to test by pressing the break and probing the same pin as the turn signals as the vehicle does not have separate brake and turn signals. However, If the problem is that you have no signal for the electric brakes on your trailer. You must have a brake controller installed. If there is one installed probe the blue wire coming out the back end of it and press the brake to be sure there is brake output. It is possible for a controller to go bad, and not output anymore.
I wrote an imformative article on diagnosing wiring problems. Click here to read.

Jan 10, 2011 | 2001 Chevrolet Silverado 2500HD

1 Answer

I hav no brake lights . Put in new brake relay sesor, changed out brake lights , I still have turning signals, but still no brake lights


You probably have a broken wire or bad ground. If you have an aftermarket trailer plug, thats the first place to look.

Sep 13, 2010 | 2001 Chevrolet Silverado 2500HD

1 Answer

Trailer wiring


Have you checked the fuse box under the hood? There are seperate fuses for the truck lights and the trailer lights. If the fuses look good use a 12 volt test light to check for power on the turn signal pins when the brake is pushed. The brake lights and turn signals use the same wires to work. Power here would indicate the wiring and fuses on the truck is all good, meaning the trouble is on the trailer. Check the bulbs to be sure they are the correct ones, they should be dual element bulbs. Make sure you have a good ground on the trailer, usually the white wire in the 4 way plug is grounded to the trailer frame, do not depend on the trailer ball to be the ground, this is asking for trouble.

Apr 06, 2010 | 2001 Chevrolet Silverado 1500

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No left turn or brake light on left for trailer truck works fine. No current in trailer plug wire


There are separate fuses for the trailer turn signals.Make sure they are good.They are in the under hood fuse block.If they are then check for corrosion in the trailer harness wiring.Hope this helps.Good luck.

Mar 10, 2010 | 2003 Chevrolet Silverado 2500HD

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

Sep 08, 2009 | 2004 Dodge Ram 2500

1 Answer

2003 duramax 2500hd brake lights stay on when lights are on


You may have faulty wiring for your trailer lights. Look under the back of the truck where the wiring harness leads to the trailer wiring harness. Usualy it is a 3 way plug in the harness. Try unpluging the harness from the trailer wiring and just plug the other 2 wires into eachother
Hope this works for you!

Dec 17, 2008 | 2003 Chevrolet Silverado 2500HD

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