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355 F355 alternator voltage regulator replacement

Discussion in '348/355' started by cheungchoyui, Jan 13, 2020.

  1. cheungchoyui

    cheungchoyui Rookie

    Oct 16, 2016
    40
    Hong Kong
    Full Name:
    Joe Cheung
    Hi guys,

    The voltage drops below 12V for few mins when the car is warmed up and at particular high rpm range. It then goes back to 13.3v after awhile. This cycle keeps repeating. I think the voltage regulator failed again.
    In fact it failed few months ago once. My mechanic installed a new voltage regulator and everything works fine. However, I don’t know which brand of voltage regulator he used.

    I m thinking to replace the VR once again.

    Some members suggest to use Denso OEM 126000-0400.

    However, my old one taken out from the alternator is 126000-1500

    Does anyone knows if they are just the same ?

    Below is the pic of my old VR

    Thanks


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  2. m.stojanovic

    m.stojanovic Formula 3
    Silver Subscribed

    Dec 22, 2011
    1,693
    Malaysia - KL
    Full Name:
    Miroljub Stojanovic
    Voltage regulators rarely fail. More often, it is the Rectifier that goes bad (blown diodes). However, since you have a fluctuating voltage, it may be just the carbon brushes.
     
    Qavion likes this.
  3. cheungchoyui

    cheungchoyui Rookie

    Oct 16, 2016
    40
    Hong Kong
    Full Name:
    Joe Cheung
    Thanks. Let me check the brushes as well


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