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Max Online: 36273 @ 01/23/13 02:34 PM
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#11859553 - 10/01/16 09:45 PM Fishfinder / trolling motor interference
Bobby Milam Online   content
Extreme Angler

Registered: 07/13/14
Posts: 1989
Loc: Arlington
I know the interference issue has been talked about many times before but mine seems to be different this time. Run humminbirds front and rear. The boat had a 24v motorguide and I got interference on the front graph when running the trolling motor. Before I tried any of the suggestions to take care of it, I bought a 36v terrova. No more interference. Traded the 36v for a 24v terrova and took it out for the first time today. I was using the built in US2 transducer and every time that I turned it on, I lost the bottom reading and the screen just filled with interference. Units are linked together so I switched it back to the transom transducer and same thing. Later in the day I was in the back of the boat and found that it was also getting the same issue on 2d,di and si screens. It was running everything off of the rear transducer. I never had the trolling motor effect both units.

Trolling motor has it's own batteries and the cable runs on the left side. FF both wired direct to the cranking battery and the wires run the other side. Units are linked together along with the MK link through a 5 port hub. Is it common for the trolling motor to effect both units? It never has before for me.

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#11859585 - 10/01/16 10:16 PM Re: Fishfinder / trolling motor interference [Re: Bobby Milam]
44 Diesel Online   content
TFF Team Angler

Registered: 12/25/12
Posts: 3416
Loc: Burleson,TX
Both of mine were effected through the network. Check the fuse in the trolling motor head and see if it is blown. Could be an issue with prop or motor. One thing that fixed mine was the $65 choke that Humminbird makes.


Edited by 44 Diesel (10/01/16 10:17 PM)

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#11859602 - 10/01/16 10:48 PM Re: Fishfinder / trolling motor interference [Re: Bobby Milam]
Bobby Milam Online   content
Extreme Angler

Registered: 07/13/14
Posts: 1989
Loc: Arlington
Ok thx. I didn't know if it was common for both to be effected. I forgot about the fuse and then will look at the choke. Thanks.

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#11859619 - 10/01/16 11:07 PM Re: Fishfinder / trolling motor interference [Re: Bobby Milam]
44 Diesel Online   content
TFF Team Angler

Registered: 12/25/12
Posts: 3416
Loc: Burleson,TX

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#11864283 - 10/04/16 01:36 PM Re: Fishfinder / trolling motor interference [Re: Bobby Milam]
rlivia Offline
Green Horn

Registered: 09/22/16
Posts: 8
If you haven't done so, you may want to also look to see if you are using a Ferrite Ring. They are basically used to reduce high frequency noise that can be product by motors - especially trolling motors. You want to add it to the power connectors.

Ferrite Rings on ESC’s: What Do They Do and How Can You Use Them?

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