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I have a 1987 Montauk. I would like to mount a bow mount Minn Kota Powerdrive 24 V trolling motor. My current battery in the boat is in the rear so I will add 2 new batteries in the console (hole cut in console floor). My 1987 Mercury 70 HP outboard does not have a voltage regulator and my Raymarine Dragonfly GPS /sonar turns off when I am above 2500 rpm's. The sonar GPS has a cutoff above 15.6 Volts. I thought I could tap one of the new 12V batteries to power the sonar GPS. I read that I should not share the same battery system for the GPS/sonar as the trolling motor because of electrical interference from the speed controller of the trolling motor. My other option is adding a voltage regulator to the existing power supply from the current wiring to the GPS/sonar. Does anyone have an experience with this that can chime in?