If you do decide to "straight power" a motor to sanity check directions, please be aware of the warning at the bottom of page 7 and 8 in the PDP User's Guide.
Quote:
Warning: Inductive loads (motor, compressor) must have a power management device (motor
controller, PCM, spike) between itself and the PDP. No inductive loads (motor, compressor)
may be directly connected to the PDP channels as this can damage current sense circuitry.
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...so use a battery without a PDP in circuit.