Following up - bought a new starter, bench tested both, old one dead as a door nail. Put the new one on, spun the motor about 1sec, then the same click. Took the new battery back to the parts house (I won’t explain why I thought maybe I killed it, that would make me look bad) and they tested it and said it was fine. Carefully cleaned all the contact points of every terminal and wire connection, cranked like crazy. Didn’t start, but it sure cranked. That led to the carburetor odyssey.
