Humminbird interference from Terrova

I’ve watched all the youtube vids, read a ton on how to reduce this.

has anyone on here had any success with reducing the noise from your TM? What worked the best for you?

Any suggestions would be great. thinking of getting one of those chokes, but not sure.

Sorry, running the Helix 7

The first thing that comes to mind is to check your grounding.

I had a 2010 era (not exactly sure of year) 958c and terrova combo in the bow and tried grounding/ chokes etc. nothing really made it improve, if trolling motor was at 0 or 100 percent sonar worked great
Anywhere in between it barely read bottom
This yr I put a new ulterra on the same sonar and it works great

I ran a ground wire from the trolling motor housing ( drilled a small hole and self tapping screw ) to ground from my starting battery. I just hooked into a ground under my front deck.

I run one group 27 batteries just for my humminbird helix 10 mega and h-bird 899 and never have any interference troubles from my terrova and they are all linked. Running one batterie for your locators is the way to go.

I just bought a new 80# 24 volt terrova with I pilot link and I have it connected via the ethernet hub to a 859HD DI humminbird at the bow and an Onix8 Humminbird at the console. The graphs are powered by their own separate battery. the Ethernet hub is running off the cranking battery. The 2 trolling motor batteries have nothing additional running off of them. I have all 4 batteries connected to the minnkota 4 bank onboard charger though.

The first time I took my boat out I had the external trolling motor transducer for my 859 on the terrova and I did not experience any interference. This weekend I took off the external trolling motor transducer and hooked the 859 up to the internal US2 sonar within the trolling motor to see how that would work. I noticed interference every once in a while while I was just drifting, but really noticed it as soon as I turned the prop on for the trolling motor. The depth readings got very sporadic.

Any Idea of what may be going on or how to fix?

I called Minnkota and they said to move the trolling motor wires as far away from the graph power wires as far as possible and see if that works. If that doesn’t work then I am going to try unhooking my onboard charger terminals from the trolling motor batteries to make sure the trolling motor batteries are completely isolated.

Thank you.

If you are using power block or your graph is running through your fuse panel, reroute the pos and neg from the graph and go directly to the battery.

I also looped my cable through a ferrite ring as a last line of defense.

MinnKota just let me know that currently down imaging units are not supported with US2 internal sonar.

I had same issues with my terrova. Humminbird sent me a new power cord with choke tube in power cord. It help…
What I did figure out was my 3 bank charger was hooked to my 2 trolling motor batteries and my cranking battery. I unhooked my cranking battery from my 3 bank charger and I did not get any interference.This was on a minnkota 3 bank charger .
Called minnkota they told me there chargers don’t do that. Weird because mine does it . Called Humminbird they sent me a new power cord choke tube for free.
This was 5 years ago…

Also there is wire that is insulted for I think air waves or interference It looks like it would be wrap in tinfoil then wrap with normal plastic cable shielding. Might won’t to use that for power cord to depth finder

Is your unit that is connected to the US2 sonar just a sonar/GPS combo, or is it capable of down imaging as well?

Fought this for two years. Installed the new blue tooth model and it was 1000 times worse. Made the dealer who I bought the boat from wire the units straight to the battery and now they work great.