I bought these for my Chevy silverado 1500

Question edited for clarity
Question moved to model category.

Help in the link, under seat looks like the best solution.

https://www.google.com/search?q=2000+Chevy+Silverado+1500+EXT+Cab+Best+box+specs+for+single+1100w+10+ported

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How to fix the Chev power window door lock switch - YouTube

? 5:04
https://www.youtube.com/watch?v=XDKaDURD8Sc
Jul 13, 2013 - Uploaded by spelunkerd
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The master switch needs to be replaced or check the con

If the ignition key does not open either door, the previous owner could have replaced the ignition lock.
The dealer may be able to cut you a door key from the VIN number.

Lets start at the beginning.
What resets itself, and what is the issue with the headlights ?

THESE MAY BE SPOT WELDED IN PLACE

follow the pipes from the cat forward, you shld be able to find them. from the cat down or back, would be your rear sensors.

Check movement of vent doors on that side. Sounds like they aren't moving over as they should. (Or hose fell off on passenger side.)

remove the handle and pull linkage by hand

I believe that it is 80w90 but you also have to add differential additive for locker that is inside. you can purchase additive at chevy dealership, napa, or other parts stores just make sure it is formulated for gm.