106SV Interference

[basshound250]

Just installed a new 106 sv on bow.Mounted transducer on Minn Kota Fortrex.I installed the magnets on the all cables to control unit.I get interference everytime i press the on switch for trolling motor.I get black shades half way up the screen as long as the motor is running.What do I need to do?Thanks

[Mike A]

[8AnDrEw9]

Power hooked to cranking battery or trolling motor batteries?

[Crappie Bob]

[Dennis S.]

Check the fuse under the head of the Fortrex to make sure it hasn't blown or corroded. Try to make sure the transducer cable is as isolated as possible from the trolling motor power. I put a wire on the skeg of my trolling motor after scraping the paint to make a good connection and ran the wire up the steering cable to the negative terminal on the trolling motor plug receptacle. Sometimes, the troller needs to be as isolated as possible. I have heard the cranking battery needs to be isolated from the charger by using a plug to disconnect it. You need to try different variations to find the right solution for your boat. All boats/trolling motors have different characteristics on interference problems; it is hard to say 'this solution' will fix your boat. You need to try different ways to find what fixes it for you.

[basshound250]

Seperate battery for electronics and wiring run from battery to electronics only.Thanks

[Dennis S.]

Seperate battery for electronics and wiring run from battery to electronics only.Thanks

Sometimes it is possible to get interference from the battery charger providing a path from the trolling motor batteries to the cranking battery.

[fishin couillon]

This interference is crazy stuff....i've had my fair share of it.....what's crazy, is that i can go to my local river and get interference as mentioned above but then go to a local lake and have none at all......just recently had a GT54 and had a little interference, put on a GT56 and NOTHING has showed up.....go figure.....

[sodaksker]

Did you notice any UFO's flying over at the time?

[Madeintheshade]

I’m new to Garmin so I’m trying to learn also.
Do the Garmin units have a noise filter settings like the birds do ?

[dett23]

I got a bird and a garmin up front had same problem humminbird said most interference is aground problem ran a wire from neg. on start battery to neg. on troll battery this solved mine hope it helps u

[basshound250]

Thanks,I'll try it.

[swamprat]

Fixed mine by junking my old Terrova, I tried every fix mentioned here and everywhere else.. Finally bought a Force and no more interference.

[Bill Reynolds]

Just installed a new 106 sv on bow.Mounted transducer on Minn Kota Fortrex.I installed the magnets on the all cables to control unit.I get interference everytime i press the on switch for trolling motor.I get black shades half way up the screen as long as the motor is running.What do I need to do?Thanks

Attached is a PDF tip sheet that I made up for a friend back during COVID shutdown, hope it is helpful.

In addition, Hummingbird makes an inline choke that mounts close to the TM pedal that is helpful. I believe the part number is TM-1, if you can’t find one let me know, I have one that I no longer use.

The PDF refers to Lowrance HDS, but I now have a Garmin 106 Ultra on the bow and I find it to be even more susceptible to interference than the Lowrance. My 106 is on a dedicated lithium battery and I still get some interference in 2D sonar.