1987 Sierra headlight issue

[Eaeyer]

Hello, I’m having an issue with my headlights — on low beams, only one light works and on high beams three lights work. However the light that works on low beam doesn’t work on high beam. Pictures below
I have already replaces the headlights, headlight switch, headlight plug, dimmer switch, and checked the grounds.
Has anyone seen this problem?? How do I go about fixing it??

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[1987 GMC Jimmy]

What I found out recently was that the low beams have two different filaments, one for low only and one for when you switch to high. I’d never seen the the filaments switching with my own eyes so I assumed they remained static. You may just have a couple of bad lights. I’d switch the two and see if the problem flips just to make sure it’s not that. If it persists, we can proceed from there.

 

[Charlie]

 

[Eaeyer]

Thanks! I’m definitely going to try this after work and I’ll get back if it doesn’t work