?assume? you have already checked all power cables for 'shorts to frame' and fixed any short with less than 100k resistance.
Traction wheels off the ground, disconnect 1 wire from all accessory like headlights and backup alarm (open their circuit)
Confirm drive motors runs when 1a (bypass) and 1 direction contactor (and line contactor, if so equipped).
Confirm all connections to tb1 through tb6 getting correct voltage for the desired operation condition.
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