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  1. #1
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    alternator not charging

    hi guys any ideas what could be the problem the alternator is nt charging but when it was taken off and repleced with a working same issue no charging then i go tthem both tested and the alternators work but dont charge the battery any suggestions would be helpful ?

  2. #2
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    Re: alternator not charging

    check the earthing points arent corroded, and that it is attached to body and to ground, then check the powerline to the battery, and any other earth points straps or whatever the engine uses.

    It is also likely to be alternator relay.

    try wiring first as thats just time, drawing a blank then try testing to alternator relay.

    my guess would be more likely a 1: corroded battery negative terminal, 2: chassis ground dodgy 3: alternator wiring and ground, 4: alternator relay, 5: fuse related to alternator.

    Hope that helps

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    Re: alternator not charging

    Do you have a batt light with ignition on non running ???

  4. #4
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    Re: alternator not charging

    no it didnt apparently the alternator is fine and the voltage regulator i have cheked the wire from battery to alternator and that pushes through current fine i just don know what else it could be and theres not many good mechanics around where i live

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    Re: alternator not charging

    Sounds silly but does your battery charge off the car? Dud battery can give you all sorts of odd problems.

  6. #6
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    Re: alternator not charging

    no it dont sound silly but that the first thing i checked but i had a hunch it would definately be something to do with alternator itself chacked battery checked wiring to it opened up the alternator turns out to be the voltage regulator it should all be sorted now thank for your help guys

  7. #7
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    Re: alternator not charging

    As asked above, does the alternator warning light in the instruments light up when you turn on the ignition BUT without the engine running?
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:


    www.helpforheroes.org.uk

    Keep XH558 in the air
    www.vulcantothesky.org


  8. #8
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    Re: alternator not charging

    Hi there,

    I've only just come up against this problem. The battery icon warning light is on when the ignition is on and when the engine isn't running. Then, when I start the engine the battery icon warning light stays on, the volt meter appears to be a couple of volts lower than usual.

    Thinking it was the battery (first cold morning of the year?) I took it in to halfords and one of their staff tested the battery with the engine off. He said it was ok. He then checked the alternator with his same diagnostic kit (with engine running) and it returned the message "regulator volts low".

    One anomaly to this was soon after I set out to Halfords yesterday the voltage needle did jump back up to 14 volts and the battery warning light went off.

    Should I follow the diagnostic process that Lofty79 recommends in the first instance?
    1: corroded battery negative terminal, 2: chassis ground dodgy 3: alternator wiring and ground, 4: alternator relay, 5: fuse related to alternator.
    many thanks

    Chris
    Last edited by ChrisYates; 09-10-2011 at 08:45 AM. Reason: increase accuracy

  9. #9
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    Re: alternator not charging

    I would fit a quality reconditioned exchange alternator. Avoid cheap recons as the likelihood is that you will be pulling it back off again all too soon, sometimes just out of warranty. Genuine VAG exchange units are pricey but reliable and have a two year parts and labour warranty.
    Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

    W.H. Auden (1907-1973), A Curse:


    www.helpforheroes.org.uk

    Keep XH558 in the air
    www.vulcantothesky.org


  10. #10
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    Re: alternator not charging

    I've read some of the wiring schematic and there appears to be an "alternator cut-in relay" on the 13 point relay carrier. I've heard that most alternators have solid state control to avoid discharging the battery at low revs. However, I'd like to try this relay first. Only thing, can't find the critter!
    Is it in the nest of relays behind the fuse panel (Right hand drive fuse panel adjacent to steering).

 

 
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