Cusser
+1y
Yep. You had posted a photo a few months ago for me showing red arrows to the three screws to remove the headlight switch guts, you stated it was a "spare B2600i switch". So if the spare I have actually came from that 1992 B2200 in the parts yard, that makes sense that it looks just like the one in the photo you posted. My spare and the one in your photo both show 5 male push-on terminals sticking out (connector at bottom of switch) and the 6th blank, and a 6-terminal white plug with 4 female push-on connectors fits there (I have that plug from the parts car).
Testing my original switch at various times over the evening and this morning, even after sticking the entire combo switch in Mrs. Cusser's freezer, showed no loss of continuity when I rotated the switch to parking lights or headlights position.
So the plan now (because I don't want to break open that plug and attach the four wires separately, or rig up an adapter plug, or solder the 6-terminal plug onto my wires) will be to re-install my original switch, but feed two wires forward through the column housing then to hang underneath the dash, so I can "jump" those two together if this happens again, and at least then KNOW whether the switch is at fault then, or not.
This might end up being similar to an issue in the early 1980s with #1 Mrs. Cusser's Chevy Luv, where 0.1% of the time it would simply stall while running, then be OK for weeks. That intermittent turned out to be a bad connection under the dash to the fuel pump relay (Luv was essentially just running out of gas and stalling !!!), and simply unplugging the connector and re-plugging it solved the problem forever. So maybe just the act of me unplugging the connectors yesterday, and to re-plug them together later this morning, may end up curing the tail light issue forever.
I will button up the combo switch later this morning, then dive into that front left leaking brake caliper. If I find anything interesting there, I'll do a new post.