I have a warn winch an 8274 that I bought used, it was dragging in the pulling direction but worked fine in the reverse direction. now it will not work at all in the spool in direction, there is voltage getting through the relays so I don't think their the problem, you think brushes or just get a new motor, and if the motor can I upgrade to the 8274-50 motor, the serial numbers are gone from the housing but it is the newer style. Let me know what you think, Larry