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Thread: Charging issue- Help

  1. 7th April 2014, 07:03 PM #1
    Brad110's Avatar
    Brad110
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    Charging issue- Help

    D2 TD5


    Prep for a school holiday trip. Battery light came on.


    Battery seems OK
    Orig Alternator not providing charge
    Replaced to find red light still illuminated.


    Charges at 14.6 -14.8 and reduces and then recovers when all items, lights/ aircon/ rear window demister/ warning lights are turned on, returning to 14.6-.8. From this I am assuming that it is regulating properly.


    All fuses are OK.


    Red light?


    Last work completed Rear shock and Airbag replaced.


    Any ideas?
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  2. 8th April 2014, 07:07 PM #2
    PhilipA
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    The red light measures the voltage. Difference between the battery or connections between and the alternator.
    Usually the red light indicates a faulty or zero alternator output but you say the alternator output is OK.
    SO
    So you have to look for perhaps shorts between the light and alternator.
    Regards Philip A
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  3. 10th April 2014, 04:21 PM #3
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    Brad110
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    Red light

    PM sent
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  4. 10th April 2014, 04:33 PM #4
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    Brad110
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    Charge light

    If it's charging at 14.4~14.8 would the light remain on showing a high charge as a fault?

    The Replacement Alternator was rebuilt so is it possible it was set/ regulated for batteries requiring higher V?? Such as AGM?

    I vaguely recall an enquiry regarding resetting something to cancel the light??

    Regards Brad
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  5. 10th April 2014, 04:44 PM #5
    bee utey's Avatar
    bee utey
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    If my memory serves me correctly, the D2 alternator works like the older ones and the charge light provides a trickle current to get the alternator fired up when it spins. A dead diode (one out of six main diodes) in the alternator would cause the red light to glow at slightly reduced brightness and provide only about 1/2 the rated maximum amperage output. Voltage output may or may not be affected. Have it checked by a proper expert.
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  6. 10th April 2014, 05:50 PM #6
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    justinc
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    Hi Brad, possibly an incorrect reg used during the rebuild, I would check there first.
    BTW, hope all is well with you lot, must catch up soon


    JC
    The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
    The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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  7. 12th April 2014, 07:35 AM #7
    trev
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    charging issue

    Make absolutely sure the earth strap to the motor is tight and clean. Rhs of motor near front under wiring harness.Need to remove acoustic cover for access.
    I had all sorts of troubles finding this issue. Battery going flat but Alternator charge using mutimeter suggested all O.K.
    Seems voltage was there,but not the current.

    Trev.
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