back to basics cheack relays switchs and fuses first befor thinking the worst. if you have already then i am unsure were to get one but if its fooked try phil at driftworks as he is running lexan windows in his now so he might have a spare
Don't hear about them going that often, but its a motor and can happen. S14 and S15 motors are different. They are also three different S15 part numbers depending on age. If necessary, you can get a replacement from Perfectrun. Usual 4-7 days.