Just a heads up.
My rv was at a shyster repair shop from the dealership we bought it from. They replaced the motor also (which I now have 2 of). Still wasn't the problem. It was a $20.00-$40.00 solenoid . Have you checked that ? Also any reputable starter/alternator repair shop can fix it for a fraction of that cost.
Just trying to help.
Problem diagnosed as motor not working. New motor ordered to correct problem. Motor estimated at $489, along with labor to diagnose problem, so I sure hope this corrects the problem.
If it is the motor that price is BS and they are very easy to replace if you can handle a wrench. I would proceed with caution unless you just want it fixed and don't care what it takes. My 2 cents