All my turn signals, brake lights and everything appears to work fine until the headlights turn on.

At all times, when I press the brake for the first time after startup, the turn signal lights on the cluster come on and stay solid until I let go of the brake then it doesn't happen again.

When the headlights are on, the left turn signal stops working when I press the brake, the right turn signal seems to slow down a bit and I have no reverse lights.

I've replaced the stop switch on the brake pedal and tried a new turn signal relay.

The truck came with a snow plow and has wiring hooked into it..

Any suggestions are appreciated.

Thanks.

Updated: Fixed

The ground connection under the bed that connects to the spare tire holder was completely rusted. I cut the wire, drilled a new hole through the same plate added a connector to the wire, placed a new bolt and no more issues.