Thanks, Dan -
9269 is shown to be a normally open switch (i.e., when button not depressed, contacts are open).
The service manual for my 28' 82 Excella describes the switch operation, when door is opened, as completing circuit to open vacuum solenoid/ dump vacuum/drop step. Unless I have misinterpreted the manual, it appears I would need a normally closed switch, 9050-1 (i.e., when door is open/ button not depressed, switch contacts are closed, sending current to vac solenoid).
Advise if I am missing something....
Incidentally, the fuse, a 10 amp, is NOT in line. Upon further searching, I found that is on the chassis fuse block, top left/yellow wire. The fuse block is on the bulkhead/right of steering column - NOT easy to access!!
'Most appreciate your quick response to my post Saturday, 03Jul'21