Lowrance x91 interferance

[fishinbiff]

I have an x 91 Lowrance graph along side another Lowrance graph. When I'm trolling with my kicker motor, the x 91 does not want to work right. Reads crazy depths and all kinds of interferance but the other one works fine. They are both hooked to the same switch. Any one know of a fix for this? Any help would be apreciated.

[bassnsd]

Where are the transducers located for both units?  Maybe the transducer for the x91 is located right by kicker motor and your other one is either away from the kicker motor or shoots through the hull.  What model is the other Lowrance graph?

[Stumper]

If they are the same frequency that might be why. It the ducer in line with any rivets on the boat?

[fishinbiff]

The other graph is like a Lowrance ct 15 sonar/GPS or something like that. The transducers are located on each side of the big motor. The one for the x91 is in between the kicker and the big motor. I'll have to check on the frequencies and the rivots. Thanks for the input.