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Victron makes a 70A unit with adjustable output and a remote on/off feature for about $140 so you would not need a relay in the main circuit. It’s cutoff voltage is 18V which might start to tickle the limits during a cold engine crank, but if the main power circuit was shifted to 24V it would...

It will if you pay attention to some details: The main control relay that provides 24V switched/ignition power, is actually energized by 12V. So whatever power converter is used, you want to have a low cutoff voltage, otherwise it may shutoff the main relay when you try to crank. These...

$10 stepdown? Please share, or was this a typo? I was figuring $100-200 for a bussman 100A converter to provide 12V. Still an order of magnitude cheaper than most all of the surplus dual volts available, and a straight 24V battery bank will last a good long time without fudzing with the 12v...

A few things to rule out as the alt doesn’t output until it gets turned on by K11, which de-energizes when the engine sees 15psi of oil pressure. Since it uses the de-energized contacts of K11(pin30-47A), K11 must be a 5 pin relay. The relay shifts power down thru Kll to the forward terminal...

There is one A1 schematic here on SS in the manuals section under present conflict vehicles, end of page 1 or start of page 2 near the 1078 A0 manuals…