Buyer beware with these.

My Latrical new Chinese $75 diesel starter never worked quite right from day
one. Early on it failed to retract the gear fully a few times, but that
stopped. After 10,000 miles it occasionally bogs immediately, failing to
turn over the engine at all, and now when it bogs the motor continues to
spin (unengaged with the ring gear, fortunately) and does not stop with the
ignition off!  I have to rap on the solenoid or remove the battery negative
to get it to stop spinning.

It's not the ignition switch or a battery problem, there is a short in the
solenoid. I have a Bosch rebuilt I'm installing now, and I know these are
not without problems either. But, with the cheap Chinese starters you are
getting what you pay for, but as they say, your results may vary.

Stuart