Trailer lights help

[serious juju]

Hi Guys, this seem to be the place with the answers.

I have an 01 Yukon XL the trialer light have been working fine until last night.
I have no right brake light on the trailer, but do have right turn light.
and when i put on the left turn both trailer lights light up like the hazardous.

Could this be a flasher problem, and if so how do I find the flasher

thanks

 

[Old Goat]

Incomplete ground circuit to trailer.

 

[serious juju]

Incomplete ground circuit to trailer.

If this what it is, how would I know, the ground on the trailer plug on the truck works fine.

Also i have multiple trailers and have the same problem with all of them

 

[woldd90]

I had that happen before on mine... Check the trailer connections on your truck. Mine were bad on my trailer, but the same thing could happen to your truck. Clean them with Coke or a nail file.

 

[krunchy]

Use the file you don't want to waste good coke

 

[aero993]

I had the same problem. I went to uhaul and purchased the bulbs with the wire coming off of it. I tapped that into the wire thats on the trailer connector. I now have trailer lights.

 

[05Yukon]

Check your trailer ball some trailers ground through the ball and if theres rust or something it wont ground. This causes the lights to do wierd things.