trailer connections messing with truck

[chevyguy3766]

every time i tow my trailer...i go to put the right blinker on and it lights up and stays on but the left blinker works fine(on the truck).and also when im towing, my cruise controll doesnt work..when i driving with the truck by itself everything works fine..how could the trailer connnections mess with my blinkers and cruise control

 

[bowtiefreak]

There is a short in the trailer wiring is my guess that is causing the flasher to stay on. Not sure about the cruise control though.

 

["350Vortec"]

every time i tow my trailer...i go to put the right blinker on and it lights up and stays on but the left blinker works fine(on the truck).and also when im towing, my cruise controll doesnt work..when i driving with the truck by itself everything works fine..how could the trailer connnections mess with my blinkers and cruise control

Sounds about what happend to my truck, Except my brake lights and dricing lights didnt work. Not sure about cruise control though. Take the ground of the trailer wiring harness, Clean to bare metal. And spray out and clean connectors. Should work afterward. Worked for me believe it or not. A guy from a garage down the road from me has the same truck as me, and he says these trucks always have problems with trailer wiring.

 

[95TwinTT]

every time i tow my trailer...i go to put the right blinker on and it lights up and stays on but the left blinker works fine(on the truck).and also when im towing, my cruise controll doesnt work..when i driving with the truck by itself everything works fine..how could the trailer connnections mess with my blinkers and cruise control

There must be some wires crossed either in the trailer or the wiring harness at the rear of your truck.

The cruise must be seeing +12 on the brake light line. It is designed to release when the brakes are on. In other words, the cruise will not work while the brakes are on……..

 

[bowtiefreak]

this should be a simple fix.