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Alternator 84 CJ7

Discussion in 'Jeep CJ' started by Doug Flory, Mar 26, 2017.

  1. Mar 26, 2017 at 12:56 PM
    #1
    Doug Flory

    Doug Flory [OP] New Member

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    84 CJ 7
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    i have 84 cj7 with 6 cylinder engine. Alternator died so I went to local auto store and got a new one. It charges ok but battery runs down when jeep is turned off. I tested battery and it's fine. Somebody said the new alternators have a built in voltage regulator, I have voltage regulator on the fender well and that built in VR is causing the battery to run down, anybody had this problem before?
     
  2. Mar 26, 2017 at 7:50 PM
    #2
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome! If it runs down when its off, you might have a parasitic drain. Might want to see whats drawing power with the engine off.
     
  3. Mar 27, 2017 at 6:51 AM
    #3
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    I agree with Chris. You have something draining the battery when it is off. Not likely to be the alternator. Look at any aftermarket electronics like lights or amplifiers that you have tied into the battery.
     

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