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I went out to my 803a and got some measurements to add to the pile. Both heaters in series 0.4-0.5ohm Single Heater 0.2-0.3ohm Voltage at first heater in series 24V Voltage at second heater in series 12V Amperage 62A per pair of heaters Ohm and Voltage readings were taken on a Fluke...

Yes that's a Mk3. You got lucky, those Mk3's can be tricky to find and expensive. I had a Mk1 in my set and replaced it with a Mk3 last year, I think it was nearly $200.

If you look at the back of the switch you'll see a diode. It's jumping pin 1 and 7. That powers the preheat during cranking no matter the ambient.

The preheat relay is energized when the S1 is in the start position. The Blue style S1 switch is known for it's contacts sticking internally seemingly at random. I recommend you undo the main wire to the heaters (116A) and use a volt meter to determine if you have voltage. Start at the output...