Could someone explain how a novice like me can add a second battery to my boat for trolling/accessories and have the alternator on my motor charge it and the starting battery? Tohatsu 40 TLDI.
There are basically two types of battery switches. One is simply and ON-OFF switch for the start battery. The other looks similar but has OFF-BAT1-BOTH-BAT 2 settings. That's the one you want. Get it right here on iBoats.