Help 12V power source in engine bay 308 | FerrariChat

Help 12V power source in engine bay 308

Discussion in 'Technical Q&A' started by Trinacria, Apr 2, 2004.

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  1. Trinacria

    Trinacria Formula Junior

    Aug 7, 2002
    665
    Long Island, NY
    Full Name:
    Baldassare Guzzo
    #1 Trinacria, Apr 2, 2004
    I really need some help here (not kidding this time - no pressure washer problems). I need to find an unswitched and a switched (by ignition key) power source in the engine bay. I could use the starter for the 12V source but was hoping for something a little easier (well closer to the distributors). If any of you have hooked up an MSD in a 308, I would appriciate some input (if you have, I also need to know if you disconnected the ignition boxes completely). I put a meter to the ignition boxes - nothing 12V all the time. Thanks in advance.
     
  2. Trinacria

    Trinacria Formula Junior

    Aug 7, 2002
    665
    Long Island, NY
    Full Name:
    Baldassare Guzzo
    #2 Trinacria, Apr 2, 2004
    One more thing - is there a ballast resistor at the ignition switch? Cant find it on the electrical print.
     
  3. BigTex

    BigTex Seven Time F1 World Champ
    Owner Rossa Subscribed

    Dec 6, 2002
    79,207
    Houston, Texas
    Full Name:
    Bubba
    #3 BigTex, Apr 2, 2004
    My 308 was fitted with MSD. They had to run a new hot wire from the fuse blocks.

    I later trashed it all and went back to stock components.
     
  4. pma1010

    pma1010 F1 Rookie

    Jul 21, 2002
    2,559
    Chicago
    Full Name:
    Philip
    #4 pma1010, Apr 2, 2004
    We ran power from the starter to a relay. Relay then powers the coils. This way, the relay is only drawing de-minimus power when the ignition is off, (otherwise the coils are powered all the time).

    I don't believe there is a switched source in the engine bay. You'd have to run one from the cabin.

    If you are trying to run power to the coils/MSD, you'll want a very high quality connection. Why not go the route I did?
    Philip
     
  5. wolftalk

    wolftalk Formula Junior

    Jan 27, 2004
    367
    san franciso area
    Full Name:
    phil
    #5 wolftalk, Apr 3, 2004
    I believe the solid yellow wire(s) on the coils are switched 12V...and unfused.

    I posted the 1981 308 wiring diagrams on http://bingo.cdyn.com/ferrari/
    (I forget if they are in the owners manual...)

    when I wired in an electromotive ignition system, I used this wire to
    power a relay that connected another wire directly from the battery to
    the new coils. I ran the new power wire through the existing tube.

    phil
     
  6. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    4,367
    NY
    #6 Steve King, Apr 3, 2004
    The switched source is the + 12v wire going into the coil resistor and the unswitched source is the battery wire going to the starter.
     
  7. Trinacria

    Trinacria Formula Junior

    Aug 7, 2002
    665
    Long Island, NY
    Full Name:
    Baldassare Guzzo
    #7 Trinacria, Apr 3, 2004
    Thank you all very much.
     

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