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  1. #1
    New Member
    Join Date
    Mar 2011
    Posts
    13
    Tractor
    MF 285

    Default 285 Mf Charging trouble

    My old 285 Mf is causing me some trouble . Replaced battery and alternator . Amp meter only show a charge after running throttle wide open ( but not always ) is there a pressure switch connected to the charging circuit ? If so where is it located . Part number for replacement

  2. #2
    Gold Member MrSteve's Avatar
    Join Date
    Sep 2005
    Posts
    477
    Location
    Booksville, Florida
    Tractor
    Massy MF-1533

    Default Re: 285 Mf Charging trouble

    Quote Originally Posted by FarmerPaul View Post
    My old 285 Mf is causing me some trouble . Replaced battery and alternator . Amp meter only show a charge after running throttle wide open ( but not always ) is there a pressure switch connected to the charging circuit ? If so where is it located . Part number for replacement
    No pressure switch... Voltage regulator problem?

  3. #3
    Bronze Member
    Join Date
    Jan 2009
    Posts
    51
    Location
    north carolina
    Tractor
    MF 35, 135, 255, 20 Ind., 5455

    Default Re: 285 Mf Charging trouble

    There is a pressure switch mounted on the oil pressure guage. when oil pressure comes up this activates your electrical system the same as turning on an ignition switch on other models. If your fuel guage and tempature guage are working this switch is not bad. If this is the case it points to the exciting diode.

  4. #4
    New Member
    Join Date
    Mar 2011
    Posts
    13
    Tractor
    MF 285

    Default Re: 285 Mf Charging trouble

    Thanks for the info . have been trying to find a wiring diagram with no luck . The temp gauge and the fuel gauge are both working . Will pull the dash and have a look . Thanks

  5. #5
    Bronze Member
    Join Date
    Jan 2009
    Posts
    51
    Location
    north carolina
    Tractor
    MF 35, 135, 255, 20 Ind., 5455

    Default Re: 285 Mf Charging trouble

    Look on the end of the alternator and you will have 3 wires. Get a jumper wire and touch it to the battery post on the alternator(the big wire) and to the wire in the plastic connector that is marked # 1 while the tractor is running and this should excite the alternator to charging and it will charge until you cut the tractor off or the battery reaches full charge. If this is the case either the wire coming from the oil pressure switch to terminal # 1 on the plastic connector on the alternator is broken or disconnected or the exciting diode which is in this wire is bad. you can use the jumper wire until you have time to trace the wiring.
    Last edited by cornshucker; 08-27-2011 at 11:37 PM. Reason: add on

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