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Thread: 97 300tdi defender - charging issues

  1. 14th August 2011, 10:02 AM #1
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    rocknodster
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    97 300tdi defender - charging issues

    Okay, after travelling 2000ks last week on holidays we get home and one of my batteries is dead... (failing under load) no big issue, shop around and get a new one. Car starts fine, next morning that battery is flat too.
    Also, I am not getting the Battery/charge light illuminating on start up (globe is fine), and I can't get more than 12.9v across the terminals when car is running.
    I've gone over the electrics and it looks like all my earth points are okay, and I'm guessing its the generator that has died BUT there is just something about that charge light not working either that has me thinking there may be another issue here.

    Anyone had this problem before? Or should I give up and enjoy the rest of my weekend and book it in with someone tomorrow (any suggestions for the Adelaide area)?

    Cheers
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  2. 14th August 2011, 10:37 AM #2
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    Blknight.aus
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    sounds like the alternator brushes have lifted.

    the warning light mainly lets you know if youve lost the excitation field.

    does the voltage vary at all with load and engine revs?

    get the voltages under the following conditions

    No Load (all accessories off) Engine Stopped (ignition on)
    Full Load (all accessories (high beam lights, aircon on full fan speed) on) Engine Stopped (ignition on)
    Full Load (all accessories off) Engine Running
    Full Load (all accessories (high beam lights, aircon on full fan speed) on) High Idle (1500rpm)

    you should see about

    NLES 12.5v
    FLES 11.5-12.5v (if its lower than 12v your battery isnt fully charged or is dying)
    FLER 12.5-13v (up to 13.8 is ok)
    FLHI 13-14.8V (over 14.8v is excessive)
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  3. 14th August 2011, 11:03 AM #3
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    justinc
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    Like Dave says Exciter circuit isn't operational, either through a brush circuit or an exciter diode in the rectifier dead. My advice is get the alt bench tested and if the rectifier IS dead, the best answer is take this opportunity to fit a 100A Disco 300 Tdi one, a direct fit and way more durable and rebuildable.

    JC
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  4. 14th August 2011, 11:12 AM #4
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    while you're at it dont forget to change the belt, idler and tensioner.

    If memory serves theres a difference in the pully size that means your existing belt wont fit.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  5. 14th August 2011, 11:22 AM #5
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    justinc
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    Quote Originally Posted by Blknight.aus View Post
    while you're at it dont forget to change the belt, idler and tensioner.

    If memory serves theres a difference in the pully size that means your existing belt wont fit.
    ONLY if you get an alternator from a early or later Disco. The same model years in Def and Disco ran the same length belt/ pulley diameter.

    JC
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