Can anyhelp me on this please?

Discussion in 'General Motoring' started by outrated, Nov 17, 2004.

  1. outrated

    outrated Guest


    My Subaru,when I start the car my voltage meter reads between 10 and 11 or
    less sometimes which makes my car weak, but when i go over 3 and half
    thousand revs my voltage shoots up to 13 amd running fine

    This is a right pain because sometimes my battery goes flat leaving to
    bump the car of leads but the battery is fine.

    Has anyone else accoured a similar problem?

    outrated, Nov 17, 2004
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  2. outrated

    mulder Guest

    Could be a weak battery and/or alternator. You say the battery is "fine"
    but have you actually had it load-tested?
    If you have a voltmeter (not the one in your car, a handheld one such as
    a multitester), connect it directly to the battery terminals. With the
    car not running and the key off, the battery should read 12.5V. If it
    reads less it is either not fully charged or it's NG. When cranking the
    engine to start the battery voltage should not drop below about 10V,
    again if it does this indicates a weak battery. With the engine running
    at idle with no electrical accessories turned on, the voltage should
    read approximately 13.5-14.5V. If it's lower, the alternator may not be
    charging sufficiently. If it's higher, it's overcharging.
    If you aren't able to do these tests yourself, take it to a shop that
    can fully evaluate the electrical system.
    mulder, Nov 17, 2004
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  3. outrated

    outrated Guest


    Thanks m8 will take it to a local outfit.

    outrated, Nov 17, 2004
  4. outrated

    Edward Hayes Guest

    AutoZone will do a voltage charging test for you free.
    Edward Hayes, Nov 17, 2004
  5. outrated

    mulder Guest

    Don't think he has Autozone in the UK :)
    mulder, Nov 17, 2004
  6. outrated

    Hallraker Guest

    Those poor people in the UK. No wonder our ancestors left there (and other
    countries.) No Autozones! :)

    Back on topic, that's how my Subaru behaved when the alternator bit the
    dust. Bad voltage regulator in my case. Take my advice, if you DIY, *do
    not* buy a cheap alternator. You're only asking for more headaches later.

    Hallraker, Nov 17, 2004
  7. outrated

    Leo Lichtman Guest

    Kragen does this also. If you walk in with an alternator, they will
    test it right at the counter. They will also roll a test stand out
    into the parking lot and test your entire charging system--the only
    cost is for any parts you end up buying.
    Leo Lichtman, Nov 18, 2004
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