Catsfan, If you are blowing a fuse you will have a short somewhere. These lifts have a very basic wiring harness for the transmission. Fused voltage to the directional control lever which sends voltage to the forward and reverse solenoids on the transmission valve body. I have not ever seen an internal short inside one of these solenoids. Im not saying it couldn't happen, but usually they either work or they don't as they are just coil wound solenoids. If I were you I would ohm out the wiring between the direction control lever and solenoids and do a wire wiggle test and see if you have resistance fluctuation. Also check the wiring where the steering column tilts and where it goes down behind the floor plate. These are the only two areas I can think of that may damage the wiring. Hope this helps.