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Thread: Mk5 golf battery not charging but alternator putting out 14.3v when running

  1. #1
    Junior Member
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    Oct 2020
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    Mk5 golf battery not charging but alternator putting out 14.3v when running

    My 2004 Golf 1.4 petrol is not charging the battery. I have to jump start every time.

    The battery light on the instrument cluster goes out after starting as it should but the battery does not seem to charge. After a 2 hr drive last night, the battery reading after turning off the ignition was 10.8v

    I am now on the 3rd battery and all have been new so I’m pretty sure it’s not a battery fault.

    when the car is running, a voltmeter over the battery terminals measures around 14.1v - 14.3v which seems to indicate that the alternator is functioning?

    I have checked the alternator fuse and that tests fine using a test light, I am not getting any fault codes on my little ELM OBD2 tester either.

    Please help!

  2. #2
    Administrator Keithuk's Avatar
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    Jun 2012
    Stoke on Trent
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    First posts normally go in introductions else you could get a free fix and we never see you again!!!

    How long is a piece of string?

    You need the charging system checked out by someone who knows what they are doing?

    ELM OBD2 is a generic scanner.

    You need to get your motor scanned (preferably with VAG-COM\VCDS) for any error codes logged in the ecu and post them, that will save a lot of guessing and check systems out.

    Thread moved to the correct section.
    2010 Golf GTD (170) CBBB, 5 Door, Shadow Blue (P6/D5Q), Transmission Code: KXZ, Flat Tyre Indicator, Basic Protection Pack + VCDS.

  3. #3
    Administrator Crasher's Avatar
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    Apr 2006
    Nottingham, England
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    All I can say is from the two measurements you made the battery is faulty. Check the strip fuses at the front of the engine bay fuse box as they do get very corroded, take each ring terminal and fuse off and clean then with fine Scotchbrite and contact cleaner. Avoid using harsh abrasives as these scratch the terminals which then let moisture creep in, I did the set on a 2012 CC last week and when I had finished I sprayed the area with terminal lacquer.
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