Question about 2004 GMC Yukon XL

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All trailer lights work on my travel trailer except there are no brake lights to trailer. The issue I can see is there is no power to the brakes at the 3:00 o'clock and 9:00 o'clock pins on my 2004 g

No travel trailer brake lights. Wiring appears to be installed correctly on trailer as we have just replaced the trailer wiring harness, but no power to the plug for the right and left trailer brake lights themselves

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Have you checked the power to the socket on your vehicle that you connect to ?

Posted on Mar 28, 2014

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There will be only 1 power wire for the brake lights as they are connected .together. What you are looking at are the indicator lights (1 left wire and 1 right wire)

Posted on Mar 28, 2014

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Posted on Jan 02, 2017

farroutideas
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SOURCE: wiring diagram or fuse box diagram-2007 GMC Envoy Denali

Hi there;

Here is the wiring diagram for the trailer wiring for your truck.
22593cd.jpg
Hope this helps
Farrout!

Posted on Mar 18, 2009

  • 1 Answer

SOURCE: trailer brake controller problem

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.


Posted on Jun 30, 2009

pops296
  • 174 Answers

SOURCE: Trailer light wiring harness

try http://www.etrailer.com/faq-wiring.aspx. They have very good concise information that might help.

Posted on Oct 02, 2009

  • 869 Answers

SOURCE: 2008 GMC C5500 factory wired for trailer harness

well i suggest you check the manual of ur gmc sierra to get the exact wiring diagram and there only u'll get port to plug into.

Posted on Jan 06, 2011

  • 10 Answers

SOURCE: 1996 GMC Yukon 5.7 Brake and

here is a wiring diagram. Are the bulbs for sure good?
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hope you can read it.

Posted on May 03, 2011

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Utility trailer electric brake are not working when connected to my truck


the wires to the electric brakes at wheels , I had this problem on my travel trailer and it turned out due to corrosion at connectors at wheels the power wasn't getting to wheels one other thing to ck is trailer plug , it turns out not all mfg wire there plugs the same , try to obtain a diagram from mfg for both trailer and truck , compare them for any differences

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Why are trailer LED running lights too bright? 2005 Jeep/2007 Harley. FIXED!! :)


brake lamps and parks are swapped
brakes are the high current lamps and much brighter.
you have them backwards.
AH ! LED lamps
and you really mean
the brake are too dim,,and parks are too bright.
and what is it not.?
it's not the jeep putting out too much voltage to TAILS. sorry its 13.3v to 15v running, on all cars.

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No trailer Brake Lights right or left side


Try the specified fuses in the under hood fuse center. they are common to blow.

Mar 28, 2014 | 2004 GMC Yukon XL

1 Answer

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

Instructions for wiring a moving trailer connector


accessconnect_logo.jpg


Trailer Wiring Diagrams 4 Way Systems

4 way flat molded connectors allow basic hookup for three lighting functions; right turn signal / stop light (green), left turn signal / stop light (yellow), taillight / license / side marker (brown) and a ground (white).

4%20way%20wiring.jpg 4way_vehicle.jpg 4 way tow vehicle side.
4way_trailer.jpg 4 way trailer side.
5 Way Systems

Same as 4 way system listed above but adds a extra blue wire for brake signal or auxiliary power. Used on pop up camper trailers or utility / boat trailers.
5way_vehicle.jpg 5 way tow vehicle side.
5way_trailer.jpg 5 way trailer side.
6 Way System, Rectangle Plug 3/4 inch by 1 inch 6 way rectangle connectors right turn signal (green), left turn signal (yellow), taillight (brown), ground (white). The red and blue wire can be used for brake control or auxiliary. Use on a small motorcycle trailer, snowmobile trailer or utility trailer. Can also be used as custom wiring on trailers with 3 light/wire systems. See "Tow Vehicle Taillight Wiring" below.
6way_rectangle_1.jpg 6 way tow vehicle side.
6way_rectangle_2.jpg 6 way trailer side.
6 Way Systems, Round Plug

Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and lighting functions such as back up lights, auxiliary 12v power or electric brakes. Note: The black (sometimes red) 12v and blue electric brakes wire may need to be reversed to suit the trailer. Check with a test light or VOM. Uses: horse trailer, travel trailers, landscaping trailer, car trailer, etc.


6way_vehicle.jpg 6 way tow vehicle side.
6way_trailer.jpg 6 way trailer side.
7 Way Systems

Round 2" diameter connector allows additional pin for auxiliary 12 volt power or backup lights. Uses: heavy duty landscaping trailer, car trailer, boat trailers, horse trailer, travel trailer, construction trailer, etc. Check with a test light or VOM.


7way_vehicle.jpg 7 way RV flat blade tow vehicle side.
7way_trailer.jpg 7 way RV flat blade trailer side.

Jan 01, 2011 | 2001 Pontiac Montana

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

2 Answers

Pressing brake causing blinker issue


The trailer harness that was installed probably has a short inside the box that distributes power to the trailer pig-tail. Remove the trailer harness. You problem will be cured.

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Travel Trailer wiring, lights and electronic brake control


i have a 1996 chevy 1500 bought a brake controler but what wire do i put the blue wire to ther are 4 white wires from brake peddle that go on when peddle is pressed on.

May 27, 2008 | 1996 Chevrolet K1500

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