Could be the switch, but IMO more likely a problem within the motor,
specifically the wiring to the park switch.
I would start by disconnecting the black/green wire at the motor, then turn
the key on again. If the motor runs through a full cycle without stopping,
then the problem is definitely inside the motor. Look for the wire
(originally red but possibly faded with time or replaced) that runs from
terminal 1 inside the housing to the park switch. Depending on the type of
motor, it will either exit the case through a small hole and run to a
terminal on top of the gear box; or run inside to a switch inside the dome.
Either the wire is shorted to ground; or the switch is not opening when the
motor reached the "parked" position.
But if the motor (eventually) stops with the black/green disconnected, the
problem is the switch or the wiring to it.
-- Randall
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