So I did what others had suggested about changing the power source for my 778c. When I power on my trolling motor I am still picking up interference on my screen only when the motor is running. I have a choke on my power wire and the noise sensitivity is set to 3 on the unit itself the only thing I can think of at this point is to use the factory transducer instead of the ipilot transducer any suggestions out there?
Those are all my posts, 
I spent quite a bit of time on the phone with HB and MinnKota. At the end of the day, we could not figure out what was going on.
What did we try?
1. Make sure trolling motor and sonar untis run off of different power sources.
2. PC-11 Power Cable
3. Running the power chords for the trolling motor and the HB on different sides of the boat (at least 6 ft apart)
4. Played with the interference setting on the HB Unit.
5. Checked the fuse in the head of trolling motor.
They would not send me ferrite rings, because they said that it wouldn’t apply to my situation (not sure why it wasn’t at least worth a shot).
The noise was coming from the base of the trolling motor. When the transducer was within a foot of the motor, I got noise. When I swung the transducer away from the motor, the noise went away. The guy from MinnKota said that I should take my trolling motor in and have it looked at to be sure that everything was running correctly. I really did’n’t want to go through all that hassle. I knew my Lowrance didn’t have the problem.
What did I do? I moved the HB to the back of the boat and my Lowrance to the front. The Lowrance has 0 issues. This type of interference seems to be pretty common for the HB units. There are a lot of posts out there on it.
Here is a link that was provided in one of the posts. I had already swapped out my units so I didn’t give any fixes mentioned in the article a try (other than what was mentioned above). It would certainly be worth your time to read this:
I will say that my dad just purchased an HB 958 and placed that on the front of the boat (which has a Terrova). There were not any issues with his setup.
Good luck! 
Drew
To be honest I’ve never been happy with the US2 transducer while mine does appear to work. You may be better off just putting the transom mount transducer on the trolling motor with one of these.
I know a lot of guys going this route so they can put their down imaging and even side imaging transducer on the trolling motor.
Wade, thats what I did. Works great now.
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