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Dynamo and regulator

  • 29-08-2016 7:58pm
    #1
    king_of_inismac
    Registered Users, Registered Users 2 Posts: 1,368 ✭✭✭


    Hi all,

    Not a classic car but classic tractor (mf135).

    It's not charging the battery so checked the dynamo and regulator.

    The dynamo is generating up to 20v on high revs. The dynamo is wired to the F and A terminals of the regulator. There are two other connectors on the regulator, earth and battery.

    This is a brand new regulator but the output (Brian terminal) when unconnected is 0volts. When connected to the battery, it measures 12v (probably just the battery voltate).

    All the wires seem correct and the dynamo working fine so no idea what the problem is. I'd suspect the regulator but it is brand new.

    Since this setup is similar to.many classic cars, had anyone any ideas or suggestions?

    Cheers!


Comments

  • #2
    type85
    Registered Users, Registered Users 2 Posts: 114 ✭✭type85


    The dynamo should be using F and D on the regulator, A and E for batt +/-


  • #3
    king_of_inismac
    Registered Users, Registered Users 2 Posts: 1,368 ✭✭✭king_of_inismac


    type85 wrote: »
    The dynamo should be using F and D on the regulator, A and E for batt +/-

    Ah really? Hopefully that's where I was going wrong.

    Cheers!


  • #4
    type85
    Registered Users, Registered Users 2 Posts: 114 ✭✭type85


    You'll have to set the regulated voltage, is the reg single or double bobbin?


  • #5
    jca
    Closed Accounts Posts: 8,585 ✭✭✭jca


    Here's a good guide http://vintagetractorengineer.com/2009/04/massey-ferguson-35-how-to-test-12v-dynamo/ Saves me a lot of typing:pac:


  • #6
    king_of_inismac
    Registered Users, Registered Users 2 Posts: 1,368 ✭✭✭king_of_inismac


    type85 wrote: »
    You'll have to set the regulated voltage, is the reg single or double bobbin?

    I think it's a double bobbin (I. E. Two internal electromagnet?). I would have assumed very little adjustment would have been required? Surely it should output 14v (or thereabouts) put of the box?


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  • #7
    jca
    Closed Accounts Posts: 8,585 ✭✭✭jca


    king_of_inismac wrote: »
    I think it's a double bobbin (I. E. Two internal electromagnet?). I would have assumed very little adjustment would have been required? Surely it should output 14v (or thereabouts) put of the box?

    One bobbin is the cutout which prevents the battery discharging back through the dynamo when the engine is idling or stopped. The other bobbin is the voltage regulator. I wouldn't touch either of these, as you say they're set already. Once you wire it in correctly it should be fine.


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