Start checking for loose connections/broken wires then. Does this truck have an ED Contactor? (Electrical Disconnect) When you turn the key on it powers up the coil on the contactor and the contactor pulls in and powers up the rest of the truck.
Raymond Pallet Jacks controllers steadily blink one blink every second then that is normal with no faults. If it blinks 7 times rapidly, pauses then blinks 3 times rapidly and repeats. That is a fault.
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