Electric starter is not getting power?

I have an MTD riding lawn mower in which the starter will not turn on and the solenoid will not click. I replaced the solenoid and had the starter motor rebuilt.
If I put a jumper from the positive terminal to the starter the electric motor, it rotates properly. I have no power to the red wire that attaches to the starter motor. All ground connections are good.
I checked the fuse, it's OK. I'm out of ideas. Any help that can be suggested would be appreciated.

Thank You,

Randy