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Electric Interferance/Fishfinder

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I have a Humminbird 400TL fish/depth finder and a new Minnkota trolling motor. These are both hooked to the same battery.

Whenever the trolling motor is running, there is heavy interference with the fish finder -- hundreds of little fish symbols show up.

I've read a bit and it is indicated that I need to ground the battery or motor, but I am not sure how to do this. Has anyone else run into this problem?

Any suggestions would be appreciated.

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