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85 Testarossa alternator light on

Discussion in 'Technical Q&A' started by boatracer, Jun 30, 2005.

  1. boatracer

    boatracer Rookie

    Jun 30, 2005
    4
    #1 boatracer, Jun 30, 2005
    Alternator light on with 12.7 V @ 1000rpm and 14.7 V @ 2000 rpm at the battery with the air on.

    Dave
     

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  2. Mike328

    Mike328 F1 Rookie
    Rossa Subscribed

    Oct 19, 2002
    2,655
    Boulder, CO
    Full Name:
    Mike
    #2 Mike328, Jun 30, 2005
    Voltages seem fine--the light should not be coming on at 14.XV.

    Someone *did* say the light comes on with overcharging... that was not my experience. Is 14.XV considered overcharging?

    Any other symptoms? (Dim headlights, interior/dash lights dim with blinkers going on, etc.)
     
  3. boatracer

    boatracer Rookie

    Jun 30, 2005
    4
    #3 boatracer, Jun 30, 2005
    The light was allways dim before with the cooler fans and ac on.It now dims at idle and brighten as rpm and battery volts go up.
     
  4. boatracer

    boatracer Rookie

    Jun 30, 2005
    4
    #4 boatracer, Jun 30, 2005
    What turns the light on in the dash.
     
  5. ASG 86TR

    ASG 86TR Formula 3

    Aug 23, 2001
    1,473
    New Jersey
    Full Name:
    Adam G
    #5 ASG 86TR, Jul 1, 2005
    When the light comes on, it is the start of your alt diods going. Time to get it checked, and if needed rebuilt. Anyone can rebuild it, just taking out is a small labour of love. Mine went, and lasted a month prior to the rebuild.
     

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  6. boatracer

    boatracer Rookie

    Jun 30, 2005
    4
    #6 boatracer, Jul 2, 2005
    Pulled it off yesterday and found the end for the main battery wire to the alternator was bad and got hot. It melted the diods.After six hours it's fixed,and after 8 years I still enjoying the drive.

    Thanks
    Dave
     

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