Offhand, off the top of my head without any wiring schematics in my hand, I think two wires are for the interior Service lamp that comes on when the door is opened.
And two other wires would be for the main door cherry switch.
The cherry switch on these BB2's are in an odd place and very hard to service.
You have to dis-assemble the metal tab bracket and cherry switch from off of that shelf, to check out the switch itself.
While your metal tab is moving back to push in the cherry switch plunger, something inside of the switch housing might be amiss.
Also, check the wiring tabs behind the cherry switch.
Make sure they are fully pushed onto the tabs and not loose.
I have no idea what why they would use two other wires?

I'd have to pull out a wiring schematic to see

what they're for.