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Thread: Need Help Diagnosing Bad Alternator

  1. #16
    Member Since
    Jul 2006
    Location
    1999. Unique Ironman
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    yes i did check all my cables adn connections and everything good. The story with is going on for awhile when i had my old battery it happend only when i used my horns at night then my battery died i got new one adn everything was still the sane (dimming at night only) but a couple weeks ago i nocided it dimms when i roll my windows up and even at day time i can see light on my dash dimming a lit bit without headligths on. So i start suspecting my alternator and im probly going to get the one that biju reccomended.

  2. #17
    Member Since
    May 2007
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    2000, Ebony Black, ....
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    Quote Originally Posted by grober02
    I have driven it more than an hour once, but mostly short 20 minute drives. Yup, the battery tested okay. Just today, I checked my VX--Of course it wouldn't start, but the lights, radio, & windows work after sitting untouched for about 2 weeks. How can I tell if something is draining the power while it's sitting (not in use)?

    Try this:
    http://vehicross.info/forums/showthread.php?t=11247
    Sold the VX 11-21-07. It was fun while I had it!
    Thanks for all the help.

  3. #18
    Member Since
    Jun 2002
    Location
    '99 Ebony Black VX, 0339
    Posts
    2,073
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    Did you DISCONNECT the cables and then reconnect them? I just had an issue like this on my ML and it was the positive post not being clean and tight - lights dimming when running, unable to start. Or dang, take it to a parts store and let them bring the tester out instead of jerking around with it.

  4. #19
    Member Since
    Feb 2003
    Location
    1999, kaiser silver, VX
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    55
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    Thanks for everyone's advice. I'll try some more thorough testing this weekend. Advanced Auto did use a rolling tester to check the charging system. And, even before that, I removed the battery and had it tested at 2 different places--both said it's fine. It is, however, a 3 year old Wal-mart special...

  5. #20
    Member Since
    Jul 2006
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    1999. Unique Ironman
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    grober,
    Try go to Autozone and something like that and get brand new battery adn try to start your VX if it wont start then def not a battery.
    just my 2 cents

  6. #21
    Member Since
    Jun 2002
    Location
    2001, Proton Yellow, VX, 1379 (sold)
    Posts
    994
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    Quote Originally Posted by grober02
    It is, however, a 3 year old Wal-mart special...
    Oh, NO!!! I fought battery issues like yours for the whole three years I had one of those in my Mustang. I didn't drive it too often and it would rarely start without a jump pack. I was trying to off-load the Mustang to my ex-brother-in-law, so I didn't want to buy another new battery. However, after three years I finally relented and bought a Sears Diehard. Now she cranks right up every time and the lights don't dim with the brakes. I wouldn't recommend one of those batteries to anybody. I'd go Diehard, Optima, (or original Motorcraft in my Mustang.)
    Gregg
    2001 Proton Yellow #1379

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