What did I do?-stalls when brake released

[sofasurfer]

LTX1050. I changed the trans drive belt. I removed the mower clutch and unplugged it. I removed the drive belt pulley. I removed the trany fan and removed the belt.
I put the belt back on. Replaced the fan. Replaced the drive pulley and mower clutch and plugged it in.
Now when I start the tractor it runs fine until I remove my foot from the brake at which time the tractor stalls as if a switch was flicked.
What did I do wrong?

 

[Scrubcadet10]

I think that's a problem with the seat switch , it's saying no one is in the seat so it shuts off the mower.

 

[sofasurfer]

I think that's a problem with the seat switch , it's saying no one is in the seat so it shuts off the mower.

Your right. The seat switch plug was not locked in. Thanks.