1995 456GT Splice S82F, S83F Location? | FerrariChat
Buy

1995 456GT Splice S82F, S83F Location?

Discussion in '456/550/575' started by Motob, Sep 4, 2024.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,270
    Frederick, Maryland
    Full Name:
    Brian Brown
    #1 Motob, Sep 4, 2024
    I am working on a 1995 456 and have traced a low voltage issue to the fusebox that appears to be due to a poor connection at splice S83F. It is switched power from the ignition switch with all yellow wires joining at the splice.
    I have seen ground splices with a number of female connectors attached to a buss bar with a number of male spade connectors, but never noticed power splices anywhere in the car.

    Does anyone know where the power splices S82F and S83F are located? They both have all yellow wires connected to them. Are they under the carpet on the floors?

    Sorry for the multiple posts, but I need to get this car fixed ASAP.
    Thanks!
    Brian Brown
     
  2. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    12,489
    Sydney
    Full Name:
    Ian Riddell
    #2 Qavion, Sep 4, 2024
    You have diagams for 456GT???? They are somewhat of a holy grail on this (sub) forum, Brian.

    As you probably know, Ferrari don't tell you where splices are. Sometimes they aren't splices at all, but are several wires squeezed into one pin. Perhaps not in this case, considering how many yellow wires there are.

    I see the M car has the same splice numbers, but couldn't tell you where they were either and the car will be wired quite differently in places. They're probably in the fattest part of the wiring harnesses under the dash. On the M car, S82F seems to be powered by both the accessory and the on key positions (unless I'm misunderstanding the wiring).

    Image Unavailable, Please Login

    Image Unavailable, Please Login
     
  3. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,270
    Frederick, Maryland
    Full Name:
    Brian Brown
    #3 Motob, Sep 4, 2024
    Unfortunately, I don't have the 456GT Diagrams, and am going by the 456M diagrams that everyone else has. The 456 wiring is slightly different from the 456m, but is close enough in this area. On the 456GT it appears that the S82F and S83F splices are powered only in the key on and not in the accessory position.

    I am measuring 12v on one of the yellow wires from splice S83F to the fusebox, but only 3.5v on the other yellow wire that powers fuse #20. This is the fault that is causing the problems with the car.
     
    Qavion likes this.
  4. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    12,489
    Sydney
    Full Name:
    Ian Riddell
    #4 Qavion, Sep 4, 2024
    Last edited: Sep 4, 2024
    The 456M may be the same. I don't have an internal wiring diagram for the ignition key for the M. I think I borrowed it from the 550.

    I just noticed an error in my coloured diagrams which I fixed up.

    https://www.dropbox.com/t/02T4L8GCjgnyW9zE

    Unfortunately, the colours are not going to help finding the splices.

    S83F seems to power items on both sides of the car, so there are no clues as to what side of the dash it might be on.
     
  5. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    12,489
    Sydney
    Full Name:
    Ian Riddell
    #5 Qavion, Sep 4, 2024
    I tried to find photos of the harness online, but there doesn’t seem to be any for sale at the moment. Sometimes they offer clues.

    Does the car’s history, if known, point to anything which may have disturbed the harness? New leather dash? De-sticky work? Stereo head unit replacement?
     
  6. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,538
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #6 scowman, Sep 5, 2024
    TAke a look at my dash recover thread. I think I posted a bunch of dash out photos. Those might help.
     
    Qavion likes this.

    7. View more ferraris for sale

    2008 F430 Spider $152,000

    12,113 Miles

    1994 F512 M $499,000

    20,008 Miles

    2021 F8 Tributo $339,999

    3,300 Miles

    2003 360 Spider $92,500

    35,015 Miles

  7. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,270
    Frederick, Maryland
    Full Name:
    Brian Brown
    #7 Motob, Sep 5, 2024
    I traced the power back through the harness and found out that it wasn't the splice. The ignition switch is defective. I would not have thought that the engine would run on just power from the accessory circuit, but it does. There is only 4-6v at the key on terminal of the ignition switch.

    Thanks everyone for their help!
     
    Qavion likes this.
  8. Qavion

    Qavion F1 World Champ
    Silver Subscribed

    Feb 20, 2015
    12,489
    Sydney
    Full Name:
    Ian Riddell
    #8 Qavion, Sep 5, 2024
    Quite bizarre. The wiring must be quite different from the M and 550 (with the Accy and RUN wiring spliced together). On cars like the 348 and F355, the accessory position only powers the ABS. For some reason, on the 550, the splices feed the relay panel via a diode. I was thinking perhaps that the 456GT had this diode and it had failed or was giving you erratic voltage readings.
     

Share This Page