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Interference on graph. #12520971 11/30/17 04:17 AM
Joined: Jan 2004
Posts: 3,743
Ranger-188-2007 Offline OP
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Have a Humminbird 688 on my bow trolling motor. Unit has worked great, but a few days ago when I would mash the trolling motor button on the foot pedal, lines would show up on the graph. When I let off the foot pedal the lines stop. Just wonder why all the sudden this is showing up. I did put a piece of rubber between the transducer and the trolling motor, but didn't change anything. Any suggestions? Thanks.


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Re: Interference on graph. [Re: Ranger-188-2007] #12521076 11/30/17 11:54 AM
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Wayne P. Online Content
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Getting RFI when you did not have it previously can be caused by several things:
Worn motor brushes
Bent prop shaft
Damaged/out of balance prop
Damaged motor shaft seal/water intrusion
Damaged transducer cable


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Re: Interference on graph. [Re: Ranger-188-2007] #12521360 11/30/17 05:30 PM
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Tjhook Offline
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Could be trolling motor yes. But l check your big motor. There's these little rectangular blocks that are anoids. If there is white corrosion all, over then sand it and clean it and see if it continues. If it helps then you have something else beside the TM issue.

Last edited by Travis@BorisMarine; 11/30/17 05:32 PM.

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