I was lookin out in my shed the other day at the motley crew collection
of old antique trolling motors I've accumulated.

Noticed most of them will run on either 6 or 12 volts.
Some have a selector switch, but one of the newer ones, a
tiny little old MinnKota, just says 6 or 12V, with no switch

My question, is would it hurt anything, and if so what, to run a modern
24V motor on 12V? Or really vice versa.
My main reason for wanting to know is curiosity, but I do have a 24V
transom motor I'd like to use sometimes on a basshunter plastic boat,
but wouldn't want to carry two batteries.