A 36-volt Minn Kota trolling motor requires three 12-volt marine batteries wired in a series combination. This will combine the voltage of each battery to create a 36-volt power source for the trolling motor. Setting up such a configuration with your marine batteries is a fairly simple process, and it requires just a couple of basic tools and a few moments of your time.
Position three 12-volt batteries in your boat's battery compartment. Align them so that the negative lead on the first battery is next to the positive lead on the second battery, and the negative lead on the second battery is next to the positive lead on the third battery.
Determine the proper wire gauge needed for your connections, based on the amperage draw of your particular trolling motor (see Resource 1). Connect the appropriate wire from the negative lead on the first battery to the positive lead on the second battery.
Connect another length of wire from the negative lead of the second battery to the positive lead of the third battery. You should be left with the positive lead on the first battery and the negative lead on the third battery. These two terminals will now output 36 volts.
Connect wires to the two remaining terminals and run them to the trolling motor. Add a fuse to the positive wire between the batteries and trolling motor, as recommended by the Minn Kota Service Manual (see Resource 2).
- It is important that you choose the proper wire gauge for your application. Check the guidelines from the manufacturer for proper wire-size recommendations.
- Cover all battery terminals to prevent corrosion and possible shorts.