Have a 2000 Chevy S10. The left headlight will not go to bright. Installed new bulb. Still no bright.
What’s going on here?
Bad headlight socket or wiring to that socket. I assume that the right side works correctly.
There may be a separate fuse for the right and left side high beams. Check the fuses. Also see if there are separate relays. When checking wiring don’t forget the ground connections.