What could have changed?

[rustedhook]

When I got my new boat last year I installed my Helix 10 MSI + G3N on the bow. Power wires and transducer cable are separated. I have the new Motorguide Tour trolling motor. I could run it at any speed and run any sensitivity setting on the Helix with no problems with interference. Now for some reason i'm getting interference only in DI mode and that's at all frequencies. If I turn the sensitivity down I get get rid of some but not all of it. Any ideas of what might be going on?

Thanks

[bpicinc]

When I got my new boat last year I installed my Helix 10 MSI + G3N on the bow. Power wires and transducer cable are separated. I have the new Motorguide Tour trolling motor. I could run it at any speed and run any sensitivity setting on the Helix with no problems with interference. Now for some reason i'm getting interference only in DI mode and that's at all frequencies. If I turn the sensitivity down I get get rid of some but not all of it. Any ideas of what might be going on?
Thanks

Try connecting a ground wire between the first TM battery neg and the start battery neg.

[06 SB]

I do not know about a MG, but there is a fuse in the head of Ultrex trolling motors that cause the same issue you are describing.

[rustedhook]

Thanks for the replies.

[SLYDoggie]

Let us know when you have a chance to check things out and provide additional information. Trolling Motor interference can be hard to diagnose.

[rustedhook]

Let us know when you have a chance to check things out and provide additional information. Trolling Motor interference can be hard to diagnose.

Will do. Its frustrating. Probably be spring before I try to figure out what's going on.

[CatFan]

Step one is to run the motor on 100% and see if the interference goes away. If so, it’s electrical noise being coupled from the PWM pulses into the electronics.

Do you have a NOCO charger?

[rustedhook]

[QUOTE=CatFan;12753040]Step one is to run the motor on 100% and see if the interference goes away. If so, it’s electrical noise being coupled from the PWM pulses into the electronics.

Do you have a NOCO charger?[/QUOTE
Helix is on a dedicated battery. No charger in-line.

[bobcoy]

Rusted, First of all the higher the frequency the more susceptible the sonar is to noise. Your Di is high frequency all the time, but the higher settings (800 and Mega) will be the worst. Even though you have separation between the cables, there is always radio interference through the air. Might require a ferrite ring with the transducer cable wound on it. Wound through it several times right at the back of the helix. Would go there first (small price and quick to do). A tip I painfully found after much troubleshooting. If the boat is not in the water while checking for noise you are wasting your time and chasing Your tail. The water grounds the hull (metal boat especially) to a high degree and eliminates most noise (plastic boat through the motor ground and/or the trolling motor in the water as well) JMO’s Bob