Yes a start switch stuck on will blow the fuse. But the motor will start and come up to speed first. Start switch not making contact, the motor may kind of rotate but not start and the fuse will blow. Start switch is normally under the end cover opposite shaft end, around the shaft. Does it come up to speed and then blow or only try to turn?would that blow the fuse. every time I go to turn it on it wants to start then blows the fuse each time. where would the start switch be ?, what I mean is that the on off switch works so thought I might take the motor off and check the wiring at the motor end as the wiring in to the capacitors looks ok and also checked to see if they are charging and discharging ok, which they are