Here's closure on this chapter.
Well, the fridge
igniter works now. I had 12v power to the frige, but not to the igniter. Reviewing the excellent link that Al gave us led me to suspect the ignition switch. When I pulled the gas controller, I realized the igniter switch was a standard lever switch. It has a long metal lever arm that is engaged by a lobe on the gas/electric control rod. This arm had been bent away from the control rod, never activiating and sending power to the auto igniter. Working on the switch, I broke it. Off to the parts supply depots looking for a switch. Turns out that a QB Products 28QBP0507 is a very good fit, except the arm is about 3/4" too long. Easily trimmed with tin snips. Installed that, tested the circuit, and everything works beautifully. In fact the igniter has an auto-feedback loop through the thermocouple, shutting it down once a flame is detected.
A few notes to the wise, the wiring diagram stuck to my refrigerator was wrong, showing some extra circuits I do not have, such as a interior light in the refrigerator. The wiring diagram in Al's link was correct.
Al's link is worth adding to out board's list. Bryant RV Services has many old operating and service manuals, plus a link to a couple of out-of-production parts suppliers.