My sonar and live will pumps are both powered from the engine starting battery. Whenever the livewell recirc pump runs (its on a timer) electrical noise causes my sonar to quit working. Is there a device that I could install to filter out this electronic noise and if so where in the circuit should it be installed. I have toyed with the idea of powering the sonar off of the trolling motor batteries but am afraid that that might be as bad or more of a problem. Anyone have any suggestions?