Blinkers but no brake or running lights

[Dan Salvin]

My lights were working fine. I did some work on the trailer (replaced springs) but left the lights alone (four pin connector). Now, my blinkers work ok but only one light (the front auburn light) work when the running lights are on and I have no brake lights. Can anyone help?

 

[MXHalofan]

Re: Blinkers but no brake or running lights

Those circuits are very basic. Start at the truck connector and check for brake and running light power. Check grounds. 4 wire is very easy to isolate and test circuits.

Does the truck lights work properly?

 

[Splat]

Re: Blinkers but no brake or running lights

The 3 things that go bad with trailer wiring is
1 bad ground
2 bad ground
3 bad ground.

In that order. More than likely this will be a number 2 issue, but could also be caused by number 1, and lastly check number 3

Seriously its prolly just a corroded ground on the trailer. you'll want to check the white wire coming off the trailer side of the plug, and ensure its got a clean connection to the trailer frame. Physically pull it off, hit it with a wire brush, or sand paper until its shiny and bolt it back on.

Bill