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Rebuilding Alternators

Discussion in 'Early CJ5 and CJ6 Tech' started by BLACKMGTD, Jul 15, 2007.

  1. Jul 15, 2007
    BLACKMGTD

    BLACKMGTD STEVE

    CANTON CT
    Joined:
    Aug 19, 2006
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    110
    I seem to need new alternators (rebuilt stock Delco ) every few years in my 258 '75 CJ,,This lastest one (almost 2 years old) started to give a whirring sound for the past few months, then the battery went dead over night,, I'm assuming it's just like the others, a bad diode. I do have a Meyers Electro-touch snow plow, and I realize that it takes a lot of power to operate, and I probably should have a higher than stock output,,, Other than the plow, there aren't any big power draw things in the CJ.. Has any one rebuilt their own alternator and boosted up the output? I'm thinking that I start to kill these alternators during the winter when I'm plowing.

    SPW
     
    BLACKMGTD, Jul 15, 2007
    #1
  2. Jul 15, 2007
    dauntless_powered

    dauntless_powered SUB COB 2024 Sponsor

    Groton, CT
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    if it were me i would just get a 100 or 120 amp 1 wire from summit or some place like that. I know napa sells one for around 90 bucks if i remember correctly. just my $.02
     
    dauntless_powered, Jul 15, 2007
    #2
  3. Jul 15, 2007
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    HEAT IS THE KILLER OF DIODES High amp surge draws are not liked by alternators. Thats why diodes in welders are about two inches across and inch thick. Don't know about your snow plow? 12vdc up-dn? Consider second battery with dual isolator used during winter only. should solve problem.
     
    Walt Couch, Jul 15, 2007
    #3
  4. Jul 15, 2007
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    I believe the rating of the alternator is determined by the number of turns of wire in the stator and field (and their resulting sizes); not something you can upgrade by changing the diodes or whatever.
     
    timgr, Jul 15, 2007
    #4
  5. Jul 15, 2007
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
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    Tim is correct about the windings. If you have an old-time alternator/generator/starter shop in your town they will be able to rebuild yours, possibly with windings that will up the capacity. The second battery and an isolator is preferred for loads like winches, plows and the like.
     
    w3srl, Jul 15, 2007
    #5
  6. Jul 16, 2007
    tommy b

    tommy b Member

    Golden, Colorado
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    tommy b, Jul 16, 2007
    #6
  7. Jul 16, 2007
    Howard Eisenhauer

    Howard Eisenhauer Administrator Staff Member

    Tantallon, Nova...
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    Nov 22, 2003
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    8,142
    Interesting, but *Do*Not* use his "Wire Capacity Chart", he's way off base on his theories & sizes. Use a piece of #4 welding cable to go from the alt to the battery.

    H.
     
    Howard Eisenhauer, Jul 16, 2007
    #7
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