I with 1931 flamingo, clean the starter and battery connections.
Inspect battery cables.
If not present, add an additional cable between the battery frame connection to the Bell Housing.
Load test your battery -
https://www.harborfreight.com/100a-6...ter-61747.html
Check your battery electrolyte level, charge with a smart charger -
https://no.co/genius5 or
https://www.amazon.com/NOCO-G750-Adv.../dp/B004LX3AS6. teh 750 ma will work , just takes a lot longer.