Question about 2003 GMC Yukon Denali

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2003 Denali has no right trailer turn signal

I've had problems with my 2003 Yukon XL Denali trailer lights for years. They seem to have originated when I hooked up a dump trailer (with LED running, stop and turn lights) and the lighting control module began to smoke. After replacing it, everything was okay for a while but now there's no right trailer turn signal ... not even an electrical signal coming into fuse box. I have 3 trailers and they work fine with other trucks so I'm pretty sure the problem's with the Denali. I'd replace the lighting module again but would like to addresses the root cause before spending the time and another $100 for a temporary solution. Thanks in advance for your help.

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magna buff

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  • GMC Master
  • 3,828 Answers

LEDs overload the original flasher relay.. replace it

if no better
run a new wire for the right trailer turn signal
and check the earths



2003 Denali has no right trailer turn signal  - index-5lx0cwnik0mveyhdlt2zffgo-4-0.jpg

Posted on Mar 31, 2017

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5 Related Answers

Anonymous

  • 61 Answers

SOURCE: all lights work and brake light at top works.

Check a few things...
- The bulbs
- Check for ground at brake lamp connectors
- Check your wiring at the connectors for power
- Check for another fuse blown
- Do not hook up the trailer until you fix the ground problem on the trailer
- On some models, there is a module to control the rear/trailer lighting system. There may be a problem in the module.

Posted on Jul 24, 2009

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gordy

  • 226 Answers

SOURCE: Four Wheel drive has stopped working.

There is a 4wd module which should be located above the glove box area. Listen for a click while shifting into 4wd from that box. If no click, look there first. Also look at the multi-pin connector on the transfer case. They are very small pins which will, if bent, wont sit properly.

Posted on Aug 17, 2009

scrtcell

  • 43 Answers

SOURCE: 05 Denali no marker lights on trailer

you need to check to see if it is connected inside the truck there is a plug below the dash near the parking brake

Posted on Aug 22, 2009

Ahmet Gunduz

  • 280 Answers

SOURCE: Right trailer turn signal does not work when

Check the plug at your gmc outlet, your right signal wire has been damaged before the plug somewhere. If you have a test light switch your right signal on and make sure it is working at the plug on your gmc, you will find it is not working, than trace the wire back from the plug till you find where it has been damaged or you can run a wire straight from plug to your right signal.

Posted on Jun 09, 2011

hkp7

  • 397 Answers

SOURCE: Have issues with trailer lights.

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.

Posted on Jun 26, 2011

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Lighting control module ? ?????? Hazard / flasher module ! Now ( there''s not even an electrical signal where the fuse plugs into the interior fuse panel.) What FUSE ??????

Stop Lamps
The STOP LP 25 A fuse in the underhood fuse block supplies battery positive voltage to the normally open stop lamp switch. When the driver presses the brake pedal, the switch contacts close and battery positive voltage is supplied to both the STOP 15 A fuse and the CHMSL 10 A fuse in the I/P fuse block, and to the turn signal/hazard module. The turn signal/hazard module then supplies voltage to both of the trailer rear turn/stop lamp supply voltage circuits. The voltage from the CHMSL 10 A fuse is to the center high mounted stop lamp (CHMSL) and the trailer jumper harness. The voltage from the STOP 15 A fuse is to the stop lamps, throttle actuator control (TAC) module, and the cruise control.
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Turn Signal/Hazard Lamps
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Do you know how to do automotive electrical circuit testing with a test light or volt meter ? How to read an use a wiring diagram to pin point testing points . ( connectors , fuse locations etc... ) How to use a power flow chart ? Here is a site for just such info .

http://www.bbbind.com/free_tsb.html Enter vehicle info . year , make , model an engine size . System click lighting , subsystem exterior lighting . Second diagram shows trailer wiring .
Electric Testing Techniques You Need to Know

Mastering Voltage Drop Testing with Pete Meier and Jerry Truglia

CHEVROLET 2007 SILVERADO TRAILER LIGHT TROUBLESHOOTING


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