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Author Topic: 788ci di problems  (Read 1571 times)

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788ci di problems
« on: April 09, 2011, 08:50:30 PM »

Got my unit hooked up on the front of the boat I put the transducer on the trolling motor. Every time you step on the power button to move the motor the DI unit screen takes the bottom of the screen up to the top and also the depth readings bounce all over from the depth you were in to up to 70 feet or more and it just keeps bouncing around. You cannot see anything on the screen until you stop power to the trolling motor then it takes several seconds to get your pic back. I am wondering if it is turbulence from the trolling motor prop causing cavitation. If so how do I fix it?

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Re: 788ci di problems
« Reply #1 on: April 10, 2011, 01:04:18 AM »

Sounds like electronic interference with your TM and electronics.  Are the TM and the sonar on the same battery?  If you have a separate starting & TM battery, put the sonar on the starting battery to separate them.

If you've already got the TM & sonar on separate batteries, then contact humminbird tech help to find an electronic method to stop your TM interference.


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Re: 788ci di problems
« Reply #2 on: April 10, 2011, 11:29:44 AM »

Do you have the power cable with the in-line choke?

Are you using the same battery for the TM and the HB?

Sounds like electrical noise for sure!


Re: 788ci di problems
« Reply #3 on: April 10, 2011, 09:45:40 PM »

I basically had the same problem with mine a few years back. Here is a link to the humminbird site on electical interference with the trolling motor. It helped me out, hopefully it will you too.
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