Depth Finder dims with trolling motor on

[beanluvr]

Anyone got a clue? I have a humminbird 150 depth finder on the bow of my boat and I use the universal sonar transducer built in to my Minn Kota Terrova trolling motor. The depth finder is powered from my cranking battery while the trolling motor is powered from a separate battery. The depth finder picks up and reads fine until I start the trolling motor, which causes the images on the screen to dim almost to a point to where you cant see anything. I have a brand new battery and on-board charging system, so I'm sure its not a power source problem. Any tips or info is greatly appreciated!

 

[Jason F-18]

There may be a setting to adjust the interference filter.