The 36 volt will not run on 24 volts. The only way is to series all three batteries to get the 36 volts. I know some have trouble with screen interference on the finders with the starting battery being hooked in series with the other two trolling batteries. I have a 24 volt system with the start and troll batteries in series and have had no problems.
Good luck Jeff.
Maybe some one else has other opinions.
The boat you rented either had the start/troll bats connected together or the trolling motor had a 12/24 volt switch to make it run on 12 volts. My best guess...


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