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The A0 schematic is in the back of all the M1078 tech manuals In the present conflict vehicles section.
https://www.steelsoldiers.com/threads/m1078-tms.118919/
there is one A1 schematic there as well
https://www.steelsoldiers.com/threads/fmtva1-electrical-schematics.158229/
I cropped the A0...