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  1. #1

    In need of MFD for 750SLT

    Howdy gang!

    So I pulled my 1995 750slt into the garage to check it out before going to the lake. I had no power to the display, and found the fuse had blown. After replacing the fuse, the display will power on but only if I hold one of the buttons, and it also gets very warm. And as is the case with MFD problems, the revs are limited to just partial power.

    I'm looking for a new MFD or tips on how to bypass/solve this problem for the weekend. Is there something else to check, or a trick to get full power?

    thanks,

    DT


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    You can unplug the MFD connector on the back of the MFD.

    That will allow the engine to run without interference, but you won't have any warnings for overheat or low oil/fuel.

  3. #3
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    Quote Originally Posted by Desert Toad View Post

    I'm looking for a new MFD

    thanks,

    DT
    Here is one that is guaranteed to work on ebay.

    http://cgi.ebay.com/ebaymotors/mfd-1...rcraftQ5fParts

  4. #4
    That eBay one looks like the way to go.

    Also, unplugging the MFD doesn't allow it to run any differently.

    I assume it is the unit that is bad and not something else before I buy a new one?

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Desert Toad View Post
    ...1995 750SLT ...the revs are limited to just partial power...
    Quote Originally Posted by Desert Toad View Post
    ...unplugging the MFD doesn't allow it to run any differently...
    If you unplug the MFD at the connector on the MFD and still have problems, then something else is causing trouble. The MFD may be bad, but something else is also not correct.

    The 1995 SLT does not have an RPM limiter in the CDI (the 1996 SLT780 did).

    What basic checks have you done?
    Cylinder compression?
    Correct spark plugs installed?
    Have the carburetors been cleaned internally and rebuilt in recent memory?
    Original fuel lines still installed?

  6. #6
    That is very interesting. I had it all cleaned up back in march and it was running great, but needed a new battery. After replacing the battery yesterday, the display didn't work because the fuse had blown. After replacing the fuse, the display only turns on if you hold a button down, but doesn't work correctly. I'm pretty sure the ski is a 95 and the trailer a 96. Unless I have that reversed. Appreciate all the help.

  7. #7
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Desert Toad View Post
    ...After replacing the battery yesterday, the display didn't work because the fuse had blown. After replacing the fuse, the display only turns on if you hold a button down, but doesn't work correctly.

    I'm pretty sure the ski is a 95 and the trailer a 96. Unless I have that reversed. Appreciate all the help.
    What Amp rating fuse did you install for the MFD?

    The MFD should not get hot with the normal 1/4 Amp fuse installed - there just isn't enough power to make it get hot (3 watts max with a 1/4 Amp fuse).

    You can check the model year of your Polaris easily enough. The last two digits of the HIN number plate on the rear deck are the model year.

    Confirm we are talking about a 750, not a 780 engine.

  8. #8
    The motor is a 750, and according to the number plate, it is a '94. I replaced the fuse with a 3amp, same that was in it before. I could see how a separate problem could produce too much power and burn up the MFD, but it runs the same with or without it plugged in. The previous owner took such good care of it, I have done nothing to the motor for the last three years. Just change out the fuel, new plugs, and charge the battery. I work on farm equipment all the time, but always get beat up with these small engines. hee hee

    Hopefully you people can help me find the problem!

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    My guess is that someone may have connected the battery backwards at one point. The 3 Amp fuse won't protect the display when that happens. Install a 1/4 Amp fuse before you connect another display.

    Reversed battery can also damage the electronics in the electrical box. LR regulator, CDI, and possibly the stator are all at risk when battery is reversed.

    The problem could have nothing to do with electrical, but I am suspecting it does.

  10. #10
    Hmm. Well I am the only one that has touched it. I wonder if I put the charger on backwards? Starts right up and runs good, just no revs now. Why would that be?

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