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S10 bright lights

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.