do not know what the problem is?

[cub108]

hello, everyone.

ok, you have to read slowly because you can get lost quick.

i was using the 109 (with a 12hp conversion) to snow plow. i went to turn it off and it would not turn off. i turned the key off and the S/G just turn really slowly and would not stop. i turned the key back on and the tractor started up immedietly. i reved it up about half throttle and turned the key off and the tractor shut off.
the S/G actually seemed a little weak when trying to start the tractor. it almost seemed like the belt was too tight for the S/G to turn over. (but it wasn't).
went to go plow the next day. tractor started up and plowed awsome. went to turn it off and same thing. would not turn off. i tried pulling the plug wire and the S/G just kept turning. put plug wire back on and fired rite up. i had to disconect the battery.
i tried to reconnect the battery and when i tried to put on the possitive cable it sparked like i was welding.i disconnected the wires form the S/G and tried putting the wires back on the battery. no sparks but the voltage regulator would click everytime i tried to connect the pos. wire.

i took out the ignition switch and put it on my 108. it started right up and turned off no problem. i took the S/G off the 109 and tried it on the 108. no sparks when hooking up the battery. tried to start it and nothing. no spark. i put back on the 108 S/G and no start or spark. (think my coil went bad? coinsidence?)

put back on the 109 S/G (the one with the problem of not shutting off). tried to hook it up and sparks. i took off the voltage regulator from the 108. hooked up the wires and sparks. disconnected the S/G wires and hooked up the battery. no sparks but clicked just like the original one did.

i am going to try and put on the 108 S/G and see what happens. hopefully it will work and then i can put the 109 coil on the 108 and see if i get spark with that one.

what is going on?

thanks.