Zach- there's sometimes (and I don't know 102's very well, so maybe not) a safety-switch on the PTO lever... make sure you've got the PTO disengaged. The safety-switch on the clutch pedal... that metal tab that pushes on it sometimes leans the plunger sideways, keeping it from depressing fully. Push down on the pedal and watch the tab push the plunger... you might see the tab flex, and the plunger stick. When you turn the key, let up on the pedal a tad, usually relieves enough bind on the plunger so it popps down. If you don't SEE a plunger, it's 'cause it broke off... that happens...
You can test the starter-generator, to see if it actually responds... hook a battery directly to the S-G... take your spare garage-battery, ground the S-G bracket to garage battery "-" post, and hook the battery's "+" post to the LARGE terminal on the S-G... if it starts spinning, then it's workin'... and your electrical problem is either battery or engine-ground, solenoid, solenoid/safety switch wiring. If it doesn't spin, it probably has a stuck brush, or some internal problem... fix this first, then go back to your other problems.