Trolling motor interference HB HD SI 899

[jaws134]

Hello all,

I've had 2 HD SI 899s for a few years. The bow unit is suddenly getting interference (only SI) when I get on the Trolling motor. If I am at 100% on TM it gets better. It seems the lower the TM % the more interference I get. When off the TM its clear as a bell. Could this be a sign of weak batteries? Since I've not had this problem before I cant think of anything else.

Thank you,

Mark

[sfw1960]

Probably bad motor brushes, unless you whacked something & bent the shaft or willy-wonked the prop.

[jaws134]

Thanks you for the input Robert.

Mark

[sfw1960]

Check it out & let us know what you find out!

Brushes can be a pain, but the TM shops can get new seals & do it pretty quick if that's the problem.

[Doug Vahrenberg]

If MinnKota sudden change I would check the fuse in the head. That often is the culprit when changes suddenly

[sfw1960]

Good point Doug, not all of them have a fuse in the head- like my old PDv2 T-Rex.



If there's a blown fuse, there's usually a cause - and IF it's water intrusion that's a bad thing....if that's the case.

Yes - check for a fuse in the head (What motor do you have?)

[Babe Winkleworm]

My MG 109 did the same thing. I ran a ground wire from the transducer mount up the shaft and tied it into the ground at the TM plug. Definitely helped but still not perfect.

[jaws134]

Im going to check the fuse tomorrow. I have a Minn kota Maxxum 80. I tried the ground wire, that did nothing at all.

Thanks all

[jaws134]

Just checked the head, no fuse in there.

[sfw1960]

Did you clunk the prop good on anything?

Otherwise I would ask Mr. Jones what he thinks - the guy know his stuff.

[jaws134]

The prop is like new, Ive never whacked anything very hard. A few tree limbs here and there but nothing major. Dont think the shaft is bent. Very frustrating.

Thanks all for the inputs,

Mark

[sfw1960]

How old is the motor, and does it have a lot of hours?
Just for giggles, you can pull the prop and may as well check for "stuff" behind it - then re-seat it...wouldn't hurt.

[jaws134]

Motor is 2 years old, Ill give it a try

Thanks

[jaws134]

nothing behind prop same deal with prop off.

[bobcoy]

jaws, Have you done anything with the wiring in your boat? I decided to organize and tidy up the wiring in mine.(cable ties and neatly coiling my excess cables). Found that I suddenly had TM interference! Putting the wires in contact with each other was the culprit. Just separating by inches made a huge difference and making sure any coiled wire was in a figure 8 rather than just a round coil. I also found troubleshooting out of the water just added to the confusion. The boat on the water benefits from the ground provided by the water. Good luck. Bob

[jaws134]

Bobcoy,

Thanks for the input. I have not changed a thing. The interference just started out of the blue.

[bobcoy]

Other than settings like sonar filters I would suggest you call HB.(possibly changed on a reset to defaults) It is obvious something has changed. Bob

[jaws134]

Update:

I decided to upgrade my Trolling Motor and installed a brand new Fortrex 80 24V. To my surprise I have the same interference. ANY IDEAS would be greatly appreciated.

Thank you,

Mark

[Wayne P.]

Update:

I decided to upgrade my Trolling Motor and installed a brand new Fortrex 80 24V. To my surprise I have the same interference. ANY IDEAS would be greatly appreciated.

Thank you,

Mark

How is the transducer cable routed and stowed?

[jaws134]

The Cable is routed around the motor housing, up the shaft, down the cable and int the unit. The excess cable is under the bow panel loose not coiled.