I have 2003 DuraMax Diesel 2500HD, had wrecked at front end and reconditioned body.

The headlamp (dimmer) at driver’s side, strong bright and passenger side, weak low. When I turn high beam switch is same as dimmer headlights.

I found the two grounds (-) attached onto frame beside at under front left bumper.
:bang :What wrong with it?
Have you experinced with that situation? I need your help to solve with it.

Thanks for feeding back...I appreciate it
Dusty