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Thread: Polo charging issue

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  1. Polo charging issue 
    #1
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    Afternoon all, wondering if anyone can shed some light on an issue with my dads polo. Recently he has noticed the battery seems to not be charging when the car is running. Its a fairly new battery - taken out the car and given a decent charge and tested to make sure it holds its charge. The alternator has been taken out and taken to a local centre and tested, and we were told its fine.

    We have tested the battery in the car with a multimeter and voltage was at 12.6 with ignition off. Start it up and the voltage jumps up to 13.5 or so then it starts dropping and settles around 12.3v. We have tested all the ground points we can see (tested 4 or 5 in engine bay) and they all seem fine. Someone told me to try an ac test from alternator b+ to a good ground and we are seeing 24v ac current. Now to me that would say the alternator diodes are faulty? Just wondering if their are any other tests we can do to see what the problem is as when the 'professionals' tested the alternator they said it was fine.

    If its any help its a 02 plate 1.4 petrol engine BBY
     
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  2. Re: Polo charging issue 
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    If it was a modern car with stop/ start I would say that was normal.

    But as you have stated it is 02 reg it will have a normal charging system that should charge the battery all the time the engine is running.

    If the battery is already fully charged the voltage should be over 14v with the engine running.

    So it looks like your alternator is goosed.

    As a last check, check all the connectors at the alternator are clean & fit well.
    Connect your voltmeter on DC between the thick output terminal & chassis, check the voltage with the engine running.

    If it drops again below 14v you can be fairly sure it needs a new alternator or perhaps just the voltage regulator ( which is part of the alternator & usually available as a spare part.)

    If the voltage is good at the alternator then you need to look for a wiring fault on the thick wire from the alternator.
     
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  3. Re: Polo charging issue 
    #3
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    I would also say it is the alternator.
    Anthropogenic climate change, the biggest con inflicted on mankind since religion...

    Slava Ukraini
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  4. Re: Polo charging issue 
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    Did you get it sorted and if so, what was it in the end?
     
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