This a long shot but when you took the starter apart did you check the brushes contacting point on the (commutator). Yellow (A) circle in photo.
The brush contacting point (commutator) should be shiny copper looking. If not, use 00 sand paper to shine-up commutator and clean out dirt in separators. Then check brushes (B 19) for wear, if brushes are touching brush holder replace brushes or buy new starter.
The only other thing is, does the engine crankshaft turn.
xxx
The crankshaft does turn. I took the starter apart and everything looked good. I sent pics to a guy that rebuilds them and he saw nothing wrong.
Im going to see if i can chase down wiring issues. I did order a new/rebuilt starter from NAPA that should be in this week. Hopefully between all of those I'll get it working.