Left signal lite working on truck but not on trailer, after checking i have no power on the fractory six pin plug. On the plug protecter it shows the turn signal a stop pin, look at back side of plug the wire is yellow, look at the back of turn signal plug ithas back and light blue colour. Is this the problem? I would think it should be right from fractory.All of the other lites work on trailer except left turn signal..
Get the standard wiring design
http://www.narva.com.au/products/browse/wiring-diagrams
Yellow is the left turn signal on pin 2
Check trailer plug and see if correct colors used on trailer plug
Would suggest getting a 12volt probe so you can test the car socket when left indicator is going on - flashing
To check that the correct pin has 12volts flashing left on it.
SOURCE: Trailer Brake Light Problem
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.
SOURCE: 2003 denali trailer wiring
If your signals & brakes are on 2 different circuits, ( for example a red lens for stop & an Amber for turn.) then you'll need to buy a converter that goes between vehicle & trailer. They're not too expensive at any trailer or RV place. I think some of the autoparts stores stock them now too.
SOURCE: Trailer wiring for 06 GMC Canyon 4x4
yes the converter fixed my problem on the tail light wiring. its beacause the stop lights and blinkers are 2 differrent bulbs.
SOURCE: I have a 2003 GMC 2500 HD. The left directional
Strange as it might seem, I had a similar problem with my 2003 Sierra 2500HD. All lights on the truck worked fine, and all lights on the trailer worked fine with the exception of the right brake light. I chased all the obvious possible reasons, (blown fuse, shorted wiring, etc). It turned out to be a sticky relay in the flasher unit in the dash. It is located behind the fuse panel on the left side of the dash, and is accessed through a hole behind the lower panel under the steering column. I removed the fuse panel cover and the lower plastic panel under the steering wheel and was able to remove the flasher unit. I ordered a new one but before I installed, it I checked the old one. The plastic cover comes off easily. There are two small relays for the trailer lights and the one for the right side was stuck in the off position. I freed it up, using a toothpick, gave it a spray of conatact cleaner and re-installed it. It is working fine now. I kept the new flasher unit as a spare in case the problem arises again.
Your problem may not be the same as mine, but at least you will know where the $100.00 flasher is located!
Hope this helps,
Hooty
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Fuse block inside truck
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Regards, Lee Davidian
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