I just had the seat off my 2145 yesterday and it would've been the perfect time to do this and tell you for sure. I just hooked it back up.
What you have to determine is if it is a normally open or normally closed switch. My guess is that it is normally closed. To find out, simply tilt up the seat and disconnect one of the wires to the switch. They are simply push on spade lug connectors. Pull off one wire, tape it so it doesn't short to ground and see if it starts. If it does, tie it up somewhere with it still taped. If it doesn't, pull off the other wire and connect the two wires together and tape them up well, then tie them off so they won't give trouble.
If you had posted this yesterday, I would've done this while I was recovering my seat and I could tell you for sure which way it is. Either way it will be simple to do, but do a good job taping and tieing the wires so they won't give you trouble later.
Good luck,
Doc