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   Fishing Sonar, GPS and Marine Electronics

Posted by screwball
10/15/2020 8:07 AM
I have a fortex 112 that was just installed. Love it. the problem is that when I activate the foot pedal it puts vertical lines in my humminbird 898 locator. I had a maxxum on there before this and did the same thing. the wierd part is if I flip it around to reverse and back up it does not do it. Called humminbird and they have no answer and say they never heard of that. There answer was to call Minnkota. checked to make sure the transducer was mounted properly.(as shown in minnkotas illustration) anyone ever had this problem? if so what is the fix.
Posted by WaterChap
10/15/2020 10:34 AM
I think it is a wire shielding problem. If your transducer cable runs next to the power cables on your trolling motor, I'd try to separate them. The other option would be to insulate one or the other to minimize the interference.
Posted by Kirk
10/15/2020 11:52 AM
https://www.humminbird.com/support/faqs/TrollingMotorInterference
Posted by FishingwithRusty
10/15/2020 1:51 PM
rf artifact, have fun............

its fixable but like all electrical gremlins can be a PITA!!!!
Posted by screwball
10/16/2020 8:05 AM
if shielding is the problem then would it not do the same thing in forward and reverse? I think that if it did it both ways it would be easier to fix. I have the same unit at the wheel so going to swap out and see what happens. Could it be the transducer somehow? I think I am into a process of elimination.

Edited by screwball 10/16/2020 8:09 AM
Posted by screwball
10/16/2020 9:05 AM
does it matter if the transducer is mounted forward or backwards?
Posted by Dgreen
10/16/2020 9:44 AM
Assuming your unit is hooked up to your cranking battery. Unhook your charger from the cranking battery and see if it is back feeding thru it. If so humminbird makes a choke to hook to your charger. If you call them they will send you a ferrite ring to put your transducer cable thru. It could also be a shielding problem between the transducer and the trolling motor itself.

Edited by Dgreen 10/16/2020 9:49 AM
Posted by screwball
10/17/2020 7:43 AM
as I said before it looks like if it was a shielding problem it would do it in both directions. wish I had another transducer to try
Posted by bronzeback45
10/21/2020 6:36 PM
This fixed all my issues using sonar, down and side scan, just run a ground wire from bow, which you will connect on a negative port down the shaft to the motor/prop. https://www.youtube.com/watch?v=8p8NJ0LvNpo&t=91s
Posted by screwball
10/22/2020 7:56 AM
going to try that. thanks
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