Re: Interference With MK Maxum TM and Lowrance 332C
Since the interference happens only when the trolling motor is in operation, the problem is with the trolling motor, not the Lowrance unit.
This is usually a loose or missing ground wire. There have been instances where an armature is slightly out of round or bent causing a small vibration that doesn't affect the operation of the trolling motor but the electronics pick it up and show it on the screen. A flat spot on the brushes can cause interference too.