Well, I’m officially out of ideas. I’ve had both starters tested and they’re both good. I changed out the battery cables with new ones. I was thinking maybe somehow I screwed up the wiring when I replaced the relays but here’s the most mind boggling thing: I pulled the starter, connected the + to the battery and the - with a jumper cable to the battery the bendix advances and the starter spins up normally. Then I put a piece of tape over the end of the starter loose enough to allow it to spin but if the bendix advances it will rip the tape. Then installed the starter on the tractor and only connected the + to the battery. I jumped the solenoid and again the stater just spins, pulled the starter and the tape was still intact. So, for some reason ONLY when the starter is installed on the tractor the bendix won’t advance. I thought maybe I had a tiny misalignment issue so I colored the ring gear and starter gear with a sharpie, no shiny metal. I also installed a jumper between the wire harnesses ground on the block and one of the starter bolts. The starter bolts to a plate that attaches to the back of the motor. I never removed that while changing the clutch so the previous ground circuit is intact with the exception of me disconnecting the battery. The battery is charged and I’ve used another just in case. Same results.