Drumski79, I recently added the MegaLive transducer to my boat and wired the 12v power wire to my main rocker switch that shuts off all power to the components. I attached ground wire and drain wire to the ground block junction terminal that my switches are attached to. Humminbird recommends using a switch on the ML transducer so it can be turned off and not drain the battery source. Good luck and post some pics on the water.
Tightlines to ya and see ya on the water.
Krappie Krane