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. 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

 

Has to be either voltage or ground. Put a meter on the hot side and check voltage. Run a wire directly from the grounds up to the negative side of battery to test the ground. I found mine dimming a bit and the chrome behind them was actually getting a haze on them that washed off. Are they the same bulbs from side to side? Since it was a rebuild? Just suggestions.

Good Luck