I just got a Terrova with universal sonar and hooked it up to my HB 787c. Every time I use the trolling motor it makes the depth go crazy and the bottom picture goes away. Even when I am not using the TM the bottom does not show up well on the sonar. I have all of this installed on my WarEagle and both the power for the TM and the HB are run together in the same raceway from the back to the front of the boat. Is the fact that they are run together causing the innerferace or is there something else I should check? Thanks for any input.