Wish I could help you. But I not the great with the electronic stuff. I just hooked up mine yesterday. No problems with it. I did put the inline fuse in first thing. No way was I going to run power to it without a fuse. I actually went on line and downloaded the newest upgrade and installed it before I even hooked up the unit to the boat. If you have a meter check the voltage up at the unit head. Pull the head off and check voltage right at the two power sockets.
Crappie spawning and morels popping up at the same time. What was God thinking when he made that schedule. It's pure torture every spring deciding which to do.