I wired directly to the battery.If the wire provided is not long enough then add a piece of 18 guage onto it.Also make sure you have a 3 amp inline fuse to the positive side as close to the battery as possible.Keep your sonar wiring away from the wire to your outboard as far as you can. The only thing that is wired to the battery that my sonar is on is my nav lights and I use them so little that there is little or no interference. I basically used the information provided with the sonar unit.
OLD FISHERMEN NEVER DIE, THEY JUST SMELL THAT WAY!!