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Small Denso alternator?

Discussion in 'Early CJ5 and CJ6 Tech' started by 1957Willys, Apr 28, 2015.

  1. 1957Willys

    1957Willys Member

    Well the free alternator that I got is starting to go out. It's a clone of a Delco Remy 70 amp alternator. I was wondering if anyone is running a small denso alternator like this one?

    http://www.ebay.com/itm/180865932442?rmvSB=true
     
    1957Willys, Apr 28, 2015
    #1
  2. Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Twin2, Apr 29, 2015
    #2
  3. 1960willyscj5

    1960willyscj5 Well-Known Member

    Or get one from Rock Auto.
     
    1960willyscj5, Apr 29, 2015
    #3
  4. 1957Willys

    1957Willys Member

    Size and room the Denso alternators are tiny and don't take up alot of space.
     
    1957Willys, Apr 30, 2015
    #4
  5. duffer

    duffer Rodent Power

    Not sure about tiny but smaller yes. That said, are you actually that cramped for space? The Delco 10 SI/12 SI are pretty much dirt cheap, available anywhere, and usually will last longer than at least 2 rebuilds on a F134. I would be just replacing your existing one with another-a 15 minute job with no bracket alterations. If you need more amps, go for the 94 amp 12 SI.
     
    duffer, Apr 30, 2015
    #5
  6. 1969_CJ5

    1969_CJ5 Sponsor

    1969_CJ5, Apr 30, 2015
    #6
  7. 1957Willys

    1957Willys Member

    Ok well I tested the voltage from the alternator today with a volt meter and it is only putting out 12.53 volts. I raised the throttle alittle and the voltage went to 14.00 volts. I have a three inch pulley on the alternator and I think since the jeep is idling at 680 rpm the alternator is spinning to slow causing it to not charge. I have been searching around and found some people are running 2.5 inch pulleys to increase the speed of the alternators. I have found a few I have been looking at but I am unsure of which pulley to buy.


    http://www.yesterdaystractors.com/A...de_22526.htm?gclid=CLKhxP_0q8UCFdQdgQod9XcAxQ

    http://www.speedwaymotors.com/GM-Alternator-5-8-Inch-Wide-Alternator-Belt-Pulley-Plain,1868.html
     
    1957Willys, May 5, 2015
    #7
  8. 1960willyscj5

    1960willyscj5 Well-Known Member

    Could always increase the idle speed a little.
     
    1960willyscj5, May 6, 2015
    #8
  9. Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member


    One wire alternator? These won't start charging until you goose the throttle a bit but once going should be fine.


    Honestly I wouldn't worry about it- unless you've run the battery right down from failed start attempts it only takes a few moments to restore it's charge once the engine comes off idle. If you're concerned because you're running a winch you should probably have a hand throttle.

    H.
     
    Howard Eisenhauer, May 6, 2015
    #9
  10. kevinmc

    kevinmc New Member

    "63A from say a 75 nova"
    So uh, are you saying the 63A alternator will fit the bracketry used for the factory 6-volt generator on an early CJ-5?
     
    kevinmc, Jun 1, 2015
    #10