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1-wire Delco-Remy alternator with tach terminal

Discussion in 'Old Iron!' started by fitterski, Nov 17, 2019.

  1. fitterski

    fitterski Active Member

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    I need such a self-exciting (internally regulated) alternator for a cummins 5.9 extracted from a '95 ram. Of the 4 mounting styles

    https://www.westmarine.com/WestAdvisor/Selecting-an-Alternator

    I need the 2" spindle version. Low or medium output capacity is plenty enough. Can anyone suggest an exact model number?
     
  2. Delmer

    Delmer Senior Member

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    This is what popped up on fleabay:

    https://www.ebay.com/itm/NEW-ALTERN...m1dUr6D:sc:ShippingMethodStandard!54665!US!-1

    What kind of belt? you'll probably need to find a multi V pulley, right?

    Most alternators are "internally regulated", if you really want a one wire, then get "one wire". Nothing wrong with it for a conversion like this, but wiring a switched power feed to the alternator is worth the trouble too.
     
  3. fitterski

    fitterski Active Member

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    It's a grooved belt, as stock on '95 ram diesel truck. I saw that alternator model a few minutes ago but cannot positively identify the tach connector on the image (some makers label it R, some others W, the image not at all). From the looks I could probably swap my existing grooved pulley over.
     
  4. fitterski

    fitterski Active Member

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    ok, I just id'd the R terminal on a blown up image, yeah, that looks like it could be perfect. I don't really need a switched supply, it's for a snow blower with everything either running full tilt or shut right down :)
     
  5. Delmer

    Delmer Senior Member

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    If you have the existing alternator, you could wire the power supply through an oil pressure switch, or with a diode from the injection pump power (the diode keeps the alternator from back feeding the injection pump and not letting you shut it off).

    Also saw replacement multi V (grooved?) pulleys for Delco alternators, just another $20.
     
  6. heymccall

    heymccall Senior Member

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    A 5.9, P7100, 190 hp snow blower?
    Pics?
     
  7. fitterski

    fitterski Active Member

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    The injection pump is a mechanical P7100 (engine is an old cummins 12-valve). Before engine start I connect the battery ground and from then on until I'm done (about 1-2 hours) everything stays ON and HOT. After a few minutes warming the engine goes to 1800 or so and never comes down. The current alternator is a externally excited DB-Electric that has lost some diodes and has killed 2 voltage regulators, so I'm keen on trying a 1-wire model with a tach tap and Delco-Remy or Denso (2 makes I've had good experiences with). I 'could' do without an alternator altogether but the belt needs an idler pulley which would have cost me almost the same price as an alternator so I installed and alternator (modded with a stator tap for tach) :) I figure I would simplify my life with a 1-wire-plus-tach Delco/Denso if I can find one, or a DB if I can't.
     
  8. fitterski

    fitterski Active Member

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    it's 175hp but that don't mean nothing because I can only use about 1800-2000 rpm, The engine replaces with twice the torque an earlier Deutz 4-holer that was undertorque. I just changed to a better rubber coupling that for once allows me a service-factor of more than 1/2 :))) There will be an update video later in the season, for now I have other probs with the 'hosting vehicle' now gone into a pro shop (other thread).

     
    doublewide and DB2 like this.
  9. fitterski

    fitterski Active Member

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    THIS is with the Cummins:

     
    Jonas302, Truck Shop and doublewide like this.