Randy, mine is a 6 volt with a bendix so it had a solenoid mounted on the starter (that was removed) and I run it from a 12v solenoid on the firewall. Talked to Ted at coffee this morning and he said they used to use the old manual rod on 12v but you can't run it to long cranking 12 volt direct. I think my starter was off an old stationery engine from a cement mixer, so that type may be hard to find.