My son has an Maxium eighteen foot runabout with a merc cruiser. We use it for fishing once in a while. We have always put two batteries up front in the hull walkway to run the trolling motor. We recently installed a second battery in the transom well and are trying to figure out the best way to wire it for 24v up front and 12 at the engine. I think all we have to do is wire it in series and put a diode in the link between the Aux bat pos terminal and the Eng bat neg terminal. I have a 6 amp diode to do this. We are wondering if they make a widgeit that takes care of this without using electronic pieces or if the Trollbridge by Yandina is the answer we are looking for?
