Denver, there are two posts that are and can be hot on the key switch. One, the run position, is hot all the time until turned to the key to the off position and another when the key is turned all the way to start. That wire should be hot then to activate the solenoid and close the circuit to the starter to activate the Bendix and the starter simultaneously. If you have the solenoid wire on the run post the starter will activate and stay on as long as the key is turned to the run position. Are you sure you have a three position switch, Off, Run, Start? Some models have a start position switch on top of the transmission that has to be in the Start position also. It keeps you from starting the tractor in gear, don't know if the 830 had it, my 630 does, the 530 does and some construction models did, don't know about the 430. Hope I have explained this so that it is clear.
That is what CNT is trying to find out with more pictures.