Ferrari 250 Gte Change from Generator to Alternator?

Discussion in 'Vintage (thru 365 GTC4)' started by christc, Nov 7, 2018.

  1. christc

    christc Karting

    Mar 3, 2013
    Dear All,

    does someone know when (vin or date) Ferrari changed for the 250 Gte from Generator Magneti Marelli DN 63 B to Alternator Magneti Marelli GCA 101? Any info welcome. If you own a S3 Gte please state what type your chassis number has.

    Thanks a lot.
  2. kare

    kare F1 Rookie

    Nov 11, 2003
    Late 2nd series by memory.
  3. christc

    christc Karting

    Mar 3, 2013
    Hi Kare,

    Thanks. I tried to narrow it down using info and pictures on serial numbers at Tom Wilsons 250 Gte website and it seems mor to be somewhere in between S3 production.


    Sent from my iPhone using mobile app
  4. John Vardanian

    John Vardanian F1 Rookie

    Jul 1, 2004
    San Francisco Area
    Full Name:
    John Vardanian
    About mid to late 1963 is when Marelli alternators started showing up.

  5. christc

    christc Karting

    Mar 3, 2013
    Tom Wilson from the Gte Register was so nice to look it up in the 250 Gte Register. Here is his answer:

    This is something I have not collected information on, but should. Going through my build sheets I see that 4039 GT (19th to last Series II) and 4081 GT (3rd to last Series II) had DN 63 B's. 4165 GT (25th Series III) and 4169 GT (27th Series III) had GCA 101 A's. So we have a range. Now we need to narrow it down.

    That being said, we understand that Ferrari ordered GTEs to be built in groups of 50. So, if the last 50 Series II's were ordered, it makes sense that 50 DN 63 B's were ordered at the same time. Then when 50 Series III's were ordered, it makes sense that 50 GCA 11 A's were ordered, making the break point the first Series III. That, of course, assumes that anything makes sense when talking about Ferrari production.

    I will contact more of the late Series II and early Series III owners to see what their cars have. For what it is worth, my car's (4247 GT, 62nd Series III) build sheet says it has a GCA 11 AA. I will have to get down to San Diego to see if that is a typo...

    Thanks to Tom

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