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  1. #1

    Join Date
    Mar 2005
    Posts
    3
    Location
    East Texas
    Tractor
    1987 Yanmar YM-220

    Default Voltage Regulator

    I have a yanmar YM-220, the charging light is staying on, it has the little 2 wire alt. how can I check to see if the reg. is working , can any of the parts stores like napa check this, if I take it off?
    Thanks so much
    Frank

  2. #2
    Veteran Member
    Join Date
    Feb 2005
    Posts
    1,467
    Location
    Olathe, Ks
    Tractor
    Yanmar 1602D

    Default Re: Voltage Regulator

    I would think any parts store can check that alternator, and if it's putting out correctly, you'll probably need a regulator. Check that all the ground connections are good first tho........

  3. #3
    Veteran Member
    Join Date
    Apr 2000
    Posts
    1,595
    Location
    Dixon, Il

    Default Re: Voltage Regulator

    Disconnect 2 alternator wires . Connect alternator wires to AC voltmeter. Run tractor at about full throttle. Output should be 20-30 volts AC. Don't run any longer than neccesary as damage may occur. If alternator is putting out sufficient voltage , regulator is probably bad.

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