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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.
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...
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