we have an 2800 manual with same problem. Giggle the wires above the starter solenoid, make sure u are in neutral on range, pto off, and u are sitting in the seat and try starting again. Always put the range in neutral and stay sitting in the seat when u turn off engine.
If starter problem with HTS it is the front back pedal safety that does not make contact with the relay. the relay is under slightly on the left of the ignition switch, push the relay module down (it is loose) and it will make the contact.