Carl_in_NH

If you're worried about winter starting, going from a 24V to a 12V system is flat out the wrong thing to do. You'll need a much bigger 12V battery, and more copper in the wires between battery and starter to crank over the engine when it's cold. Not to mention finding what would be an odd-ball starter wound for 12V operation for this engine. Stick with 24V systems; keep your system charged when not using the truck (two 12V chargers, a 24V charger, or better still run the truck once every couple weeks and keep the system charged). Use a 24-to-12V power converter to run accessories that you want.

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-Carl

1971 M35A2C W/W
1986 M105A2
MEP-003A
MEP-017A