Larry,

Solenoid hyster number is 326893. You can usually find starters and solenoids at most electrical shops. Also, some auto parts can supply you with some relays. If you have numbers and make on the part you will have better luck. I do not see a starter relay in the system. It does have a neutral safety switch mounted at the transmission valve body. You should have constant power going to the starter solenoid. once the key switch is turned to the start position, power is applied to the start solenoid connection at the yellow wire. The solenoid should pull in sending the bendix into the flywheel and turn the starter. Good Luck.