I have three batteries, one starting battery in the back of the boat and two batteries in the front of the boat. In the front of the boat I have two 12V receptacles/plugs, each of the front batteries is wired to a separate receptacle. I have been using one for a 12V trolling motor and one for my depth finder.

I just purchased a 24V trolling motor and I am needing to re-wire. I bought a new receptacle and plug to use for the trolling motor. These have three wires and the package shows a diagram for wiring them to run 24V or 12V from the same plug. I am planning to wire the trolling motor plug/receptacle for 24V only, tie the two front batteries together in series.

I was just wondering if I can tie the front batteries together in series for the trolling motor receptacle/plug and then also wire one of the existing receptacles to the same batteries for a 12V connection. Can or should this be done and if I use this to run my depth finder will/might I have interferance or problems? Or should I run the depth finder off the starting battery?

I also have a 3 bank charger and was told I could leave it hooked the same, one positive and negative wire set to each battery. Is that correct?

Thanks,
Patrick