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  1. #1
    JK Junkie 07JKX's Avatar
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    Mar 2007
    Location
    Kennesaw, GA
    Posts
    2,707

    Default battery light, charge system output high, and whine noise

    yea! so everything was fine yesterday until I went to start the jeep. Cranked right up, my battery light came on, and I noticed a very loud whine.

    The whine noise varies based upon rpm.

    I used my superchips to pull a "charging system output high" code.

    After some google research, I checked my battery cable and tightened the accesory wing nut. Battery light went away and after clearing the code, it no longer appears.

    PROBLEM. I still have a terrible whining noise.

    Had advance auto parts check the batter and alt... they say both are GOOD

    Had autozone check the same and they say my Alternator is BAD

    Does anyone have any experience with this? Does this sound like an alternator issue?

    So long as the jeep cranks and runs, could there be any problems if I do not replace the alternator right away? ie electrical issues?
    2007 Jeep Green Wrangler Unlimited
    TF 2. 5" BB
    PA 1" BL
    16x8 Cragar Soft 8's
    33" AT's
    Cobra CB
    On Board Air
    Superchips Flashpaq
    Hi-Lift
    PJ Front Stubby
    Ramsey REP 8500 w/in cab controls
    Lots O' Lights

  2. #2
    JK Enthusiast jcrcan25's Avatar
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    Jan 2011
    Location
    Greeneville, tn
    Posts
    240

    Default

    do you/ did you have a cat ??

  3. #3
    JK Newbie Jbry's Avatar
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    Sep 2010
    Location
    GA
    Posts
    85

    Default

    Had the same thing happen to my jeep after I installed a distribution block, same code, same sound....it didn't go off when I retightened my cables back, it did however go off and everything went back to normal when I had my alternator rebuilt...blown diode:(

  4. #4
    JK Junkie 07JKX's Avatar
    Join Date
    Mar 2007
    Location
    Kennesaw, GA
    Posts
    2,707

    Post

    Quote Originally Posted by Jbry View Post
    Had the same thing happen to my jeep after I installed a distribution block, same code, same sound....it didn't go off when I retightened my cables back, it did however go off and everything went back to normal when I had my alternator rebuilt...blown diode:(
    that was pretty much exactly what happen to me and almost word for word from the autozone guy. blown diode.

    i found a replacement for 150 and change with a lifetime warrantee. I guess i should go ahead and buy it. At least i will never have to pay for another alternator after this one.

    thanks man.... well kinda... lol ... and here i thought i was going to get to make a principal only payment on the jeep this month

    BTW... how long did you drive around prior to fixing it?? I am wondering if I can wait for the next paycheck without damaging anything or if I should just throw it on the credit card
    2007 Jeep Green Wrangler Unlimited
    TF 2. 5" BB
    PA 1" BL
    16x8 Cragar Soft 8's
    33" AT's
    Cobra CB
    On Board Air
    Superchips Flashpaq
    Hi-Lift
    PJ Front Stubby
    Ramsey REP 8500 w/in cab controls
    Lots O' Lights

  5. #5
    JK Junkie 07JKX's Avatar
    Join Date
    Mar 2007
    Location
    Kennesaw, GA
    Posts
    2,707

    Default

    okay... alternator threw a "charging system output low" code on me now.

    The good news - that annoying whining noise went away

    The bad news -so did the functionality of the alternator

    lol
    2007 Jeep Green Wrangler Unlimited
    TF 2. 5" BB
    PA 1" BL
    16x8 Cragar Soft 8's
    33" AT's
    Cobra CB
    On Board Air
    Superchips Flashpaq
    Hi-Lift
    PJ Front Stubby
    Ramsey REP 8500 w/in cab controls
    Lots O' Lights

  6. Default JK-Forum


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