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Thread: older auto pilot trouble

  1. 03-17-2012, 12:52 PM #1
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    Default older auto pilot trouble


    I bought a used autopilot 812 ,sometimes it has a mind of its own.I called M-K and they tell me the compass goes bad the liquid evaporates and so forth Is this part something I can do or a dealer only ,wondering if I can drill a small hole add water and hot glue or silicon it shut and try it
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  2. 03-18-2012, 05:29 AM #2
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    What's the symptoms when you say..."mind of it's own"? Does it start spinning left or right eraditcally and you're forced to hit the pedal to stop it or turn the AP off?
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  3. 03-18-2012, 05:37 AM #3
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    Sry messed up
    Last edited by gotta_fish; 03-18-2012 at 06:04 AM.
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  4. 03-18-2012, 05:41 AM #4
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    Yes it will go either all the way left or right
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  5. 03-18-2012, 10:20 AM #5
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    I don't know anything about that motor but would suggest that if you add any liquid it might ought to be mineral oil or something like that instead of water. Might send CanePole a PM since he is very knowledgeable on those motors.
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  6. 03-18-2012, 11:25 AM #6
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    I don't know what a 812 is???? Need p/n on compass/autopilot circuit if possible. TM part no would help a lot.
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  7. 03-18-2012, 11:27 AM #7
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    MINN KOTA TROLLING MOTOR PARTS PAGE - QUICK REFERENCE PAGE | REPLACEMENT PARTS - NORTHLAND MARINE - AUTHORIZED SERVICE CENTER
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  8. 03-18-2012, 12:14 PM #8
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    Yeah, that's not water that they use in them. A couple things to check that can cause that is bad/loose power connections and when the motor is deployed the shaft must be within 5° of verticle.

    This is from the manual

    PART I - Case VI. AutoPilot function is erratic and doesn’t maintain a heading.
    Step 1.
    Make sure motor is mounted within 5 degrees of level and there is no ferrous metal object(s) near the motor that
    may be affecting the compass (including screws and/or nuts).
    Step 2.
    Check motor for excessive vibration. Inspect propeller and propeller shaft for damage. (Excessive vibration
    can cause the AutoPilot compass to oscillate causing erratic operation.)
    Step 3.
    Check for proper voltage to motor while motor is under load. AutoPilot steering is susceptible to erratic
    operation in low voltage situations. (Use of adequate wire gauge in boat or any leadwire extension is critical to
    avoid voltage drop / low voltage to the motor; as can an inadequate or corroded plug / plug receptacle.)
    Fair Winds and Following Seas

    Bill H. PTC USN Ret
    Chesapeake, Va

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  9. 03-18-2012, 03:27 PM #9
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    Here is another place for parts. Quick shipment also. I do not own or work for this company.

    Boat Trolling Motors & Parts
    Fishing is a way of life. Teach your grandchildren to fish, hunt and enjoy the outdoors
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  10. 03-18-2012, 08:11 PM #10
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    You can get an AP compass board off of eBay brand new for pretty cheap if you're sure that's where the problem is after troubleshooting.
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