My fish finder just started having noise from the trolling motor as well. I have had the unit three years and never had (or noticed) a problem before.

I recently fished Dale and thought I was seeing stake beds in every creek I went to until I realized that every time I hit the trolling motor another "stake bed" would appear. (I was wondering who had built these perfect looking stake beds in 45 feet of water.)

The unit is a 997 and the trolling motor is a Maxxum 80. The finder is mounted by the console and the 'ducer is on the back (i don't have a bow unit yet). The TM cables go up the other side of the boat and I run the finder off of the cranking battery.

I did recently replace the top of the trolling motor because the directional arrow had broke. I thought I had improved (if anything) all wiring connections in the TM when I had it apart. I think I will take another look in there and see if something doesn't look right.

Good Luck with yours