My set up. Helix12 mega g3n at console. Helix7 mega g3n up front. Minn Kota ulterra w/ IPilot link. All linked together and all new. Problem is on my 7 only image it will show on unit is side scan from back transducer. Sonar or down will not work at all . Seems like it's not seeing ulterra transducer. Am I not turning something on or ? Thanks