My son's 01 blazer was hit by a deer. It took out the drivers side headlight,grill and turnsignal.I replaced the headlight and It works but both lights look dim and will not work on high beam. When I disconect the new light the other headlite works fine. I don't know what to do .the wireing was not damaged that I can tell. I think I need a wireing diagram for this vehicles lighting cicuit. Any one have any suggestions.

 

Check the grounds!

 

Also check the fuse relays for your high beams

 

I checked the fuses under the hood and that was the problem.Thank you for the info