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I just replaced the headlight switch and decided to check the lights before I buttoned everything up. Here's what happens:
Low Beams: Only passenger side comes on
High Beams: All four lights come on as they should
So clearly the driver low beam lamp is ok, but why would this one only come on when I turn the high beams on? I'm thinking it is not an issue with the new switch because the passenger low beam works as it should.
I did not check the lights before I started the project, so perhaps this problem existed before I replaced the switch. I suppose I could put the old switch back in and see.
I had (incorrectly) assumed there was only one filament since there are separate high and low beam bulbs. Learning more every day. Thanks for your help.