I've got interference on the bow HDS10 and Lowrance 520. I'm pretty sure it is trolling motor related. Trolling motor is Minkota Maxxum pro 101. Interference is on 2D sonar. Both are using the transducer that came with the Minkota. Have an A-B switch installed to go back and forth between units. Checked for loose connections under motor head as per Ranger dealer. Does anyone know of an interference kit available? Any other ideas? Thanks.