As I slowly work through the wiring and connections on my bus (1982,
born diesel Westy, now AFC), it's two steps forward and one step back.
The latest is that the double wire to the door switch for the dome
light disappeared. There are two connections for that switch. One is a
single wire, gray I think, and the other is a double brown and white.

My question: where should I look for it? Is it up the A pillar, down
the A pillar, or neither?

Mark