Last week I took my car our of the shed and noticed the powermaster did not start up. I followed the gnttype.org steps on diagnosing it. The switch had resistance between all the terminals. I then check the fuse and it was good. The motor terminals between b and d did not have resistance. I purchased a used motor, after installation the fuse now blows after startup. Does this mean my new motor is bad, or is there something else I should look for?