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Battery charger rectifier plate woes

Discussion in 'Automotive Electronics' started by Kirk peters, Mar 30, 2016.

  1. Kirk peters

    Kirk peters New Member

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    Can a different style rectifier be substituted like in a truck alternator?
     
  2. JimB

    JimB Super Moderator Most Helpful Member

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    I am not exactly sure what you are asking, but if you want to use the rectifier from a truck alternator in a battery charger, the answer is yes, probably.

    The devil is in the detail.
    Depending on the configuration of the battery charger, and the rectifier from the alternator.

    JimB
     
  3. MikeMl

    MikeMl Well-Known Member Most Helpful Member

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  4. dave

    Dave New Member

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  5. tcmtech

    tcmtech Well-Known Member Most Helpful Member

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    Some more info is needed.

    Age of the unit.
    Battery charger voltage range.
    Continuous output rating.
    Peak cranking amp rating.

    When you say rectifier plate are ou referring to a modern battery charger that has a number of undersized button diodes up against an aluminum heat sink or an old style (30+ years old) that uses a large multi-layer selenium plate type rectifier?
     
  6. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

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    There were the TOP HAT pressed in diodes which you would find in both alternators and chargers. Vintage 1968 or so. The cases have different polarities.
     
  7. shokjok

    shokjok Member

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    An OEM replacement part would be more expensive than the alternator, and industrial replacement parts aren't direct pop-in pieces unless you can isolate them from the chassis ground.
     
  8. spec

    spec Well-Known Member Most Helpful Member

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    Some alternator diodes are very leaky, especially from early alternators, so unless you are building a high current rectifying circuit (20 amps or so), alternator diodes may not be suitable.

    Of course, you can always check any diodes that you propose to use by measuring the leakage current with a meter when a reverse voltage, the same as your proposed new circuit, is across the diodes

    spec
     
  9. RODALCO

    RODALCO Well-Known Member

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    The question asked is very vague. Does he want to replace truck alternator diodes which have blown, or use alternator diodes in a battery charger ? (12 or 24 Volts ?)
    Alternator diodes require forced cooling otherwise they will prematurely when fitted outside of the alternator.
     

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