UD Pullies Cause of Alternator demise??

Discussion in '2005 - 2009 Specific Tech' started by SpeedRacer GT, Apr 8, 2008.

  1. SpeedRacer GT New Member

    Member Since:
    Dec 6, 2006
    Message Count:
    2
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Spring, Tx
    So my car started freaking out yesterday and I figured it had something to do w/ voltage.. Anyway I took it to the Stealership and they claimed that my underdrive pullies were the demise of my alternator.. Has anyone else had this problem?
    SpeedRacer GT, Apr 8, 2008
    #1

  2. COBESGT New Member

    Member Since:
    Oct 19, 2004
    Message Count:
    232
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Dubuque, Iowa
    Do you do a lot of idling in traffic in your car? If so, that can be hard on your alternator. As long as you are around 1K-2K rpms (normal driving rpm range), the alternator should be fine.
    COBESGT, Apr 8, 2008
    #2

  3. Snooze New Member

    Member Since:
    Jan 17, 2008
    Message Count:
    43
    Likes Received:
    0
    Trophy Points:
    0
    ^^^
    IN OTHER WORDS
    for warrenty purposes. YES.
    you can't take a modded car to a dealer, and expect them to fix a problem clearly linked to the mod... /shrug.
    "Now you Know"
    Snooze, Apr 9, 2008
    #3

  4. PoopDawg Autozone Junkie

    Member Since:
    Jun 21, 2002
    Message Count:
    1,435
    Likes Received:
    2
    Trophy Points:
    38
    Location:
    Orlando, FL
    Thus this is the reason I do all my own work, even with 9K miles.
    PoopDawg, Apr 9, 2008
    #4

  5. 2k05gt Member

    Member Since:
    Nov 30, 2005
    Message Count:
    64
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Northern Virginia
    I had the same thing happen to me... No the UDP did not cause the issue, the Voltage Regulator is designed to regulate the voltage from Idle (500-900 RPM) at 11.5 - 12.1 volts at full RPM 6250 the VR regulates 12.9 - 14.0 the range with a 25% reduction in rotation in minimal to the VR. the actual Generator can generate between 12VAC at 500RPM to 52VAC 6250 RPM so no matter what the Generator is spinning at, the VR tries to maintain the charging voltage at 11.5 to 14.0 VDC

    I talked to the service manager and provided him with the TSB Stating the Bad Alternator issue on the Mustangs and a paper on how the Alternator works and a quick mention of the Magnuson Moss Act stating his duties in this dispute.

    Key is DO NOT GET ANGRY or MENTION LAWYERS this usually pisses them off.
    be calm and try to prove your case with facts.

    There is a TSB out stating the Exact to the "T" issue I was having (which was not related to the alternator) "Cam position sensor failure " CEL DTC P0340.

    This article supersedes TSB 05-23-17 to update the vehicle line coverage. ISSUE:

    Some 2005-2006 F-Super Duty and Expedition/Navigator and 2004-2005 F-150 vehicles, equipped with 5.4L 3V engine, and 2005-2006 Mustang GT vehicles, equipped with 4.6L 3V engine, may exhibit a diagnostic trouble code (DTC) P0340 and/or P0344; or 2006 Explorer 4dr/Mountaineer equipped with a 4.6L 3V engine may exhibit a (DTC) P0345 and/or P0349. This may be due to a malfunctioning diode or open phase connection in the generator.
    2k05gt, Apr 10, 2008
    #5

Share This Page