Electrical Connectors | FerrariChat

Electrical Connectors

Discussion in 'Technical Q&A' started by scowman, Oct 29, 2018.

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

  1. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #1 scowman, Oct 29, 2018

    Attached Files:

  2. Ricambi America

    Ricambi America F1 World Champ
    Sponsor Owner

    Dec 7, 2003
    16,251
    Winston Salem, NC
    #2 Ricambi America, Oct 29, 2018
  3. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #3 scowman, Oct 29, 2018
  4. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #4 scowman, Oct 30, 2018
  5. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    10,667
    CT
    Full Name:
    John Kreskovsky
    #5 johnk..., Oct 30, 2018
    Connectors melt due to excess heat cause by a bad connection, excess resistance. Replace both male and female side of the connector and you should be ok.
     
  6. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    5,686
    Central NJ
    Full Name:
    Dominick
    #6 flash32, Oct 30, 2018
    Even after you replace connector .. keep an eye on it .. it may be the fan motor is going south and pulling to much current causing overheating and melting of connector

    Sent from my moto x4 using Tapatalk
     
  7. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #7 scowman, Oct 30, 2018
    Last edited: Oct 30, 2018
    Took it apart, cleaned contacts, bent contacts up for tighter fit, applied Oxguard, soldered and replaced. It works! Good for now but will keep an eye on it. Ordering a new connector for a proper fix at a later date.

    Of note is the wires on the fan are much thicker guage than the wiring harness. Interesting how the engineers of the fan have a different opinion than the engineers of the wiring harness...

    Might be a good candidate for a fat wire relay direct from the alternator which is not far away.
     
    Ak Jim likes this.
  8. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #8 scowman, Oct 30, 2018
    Any idea what the motor resistance should be? I got about 0.4 ohms when I measured after my "repair."
     
  9. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    5,686
    Central NJ
    Full Name:
    Dominick
    #9 flash32, Oct 30, 2018
    Unfortunately I don't but maybe others can chime in

    Sent from my moto x4 using Tapatalk
     
  10. rugby

    rugby Formula Junior

    Apr 10, 2015
    364
    Atlanta
    #10 rugby, Oct 30, 2018
    That's because the engineer of the fan does not know the size of the wire the harness engineer intends to use. So, to be safe, he must specify a fan wire size appropriate for the maximum power rating of the fan, plus some safety margin.

    Since the wiring harness engineer is responsible for circuit fusing, he can use a wire size appropriate for the size of his fuse. Depending on the size of the fuse he selects, the harness wire size may well be smaller than the fan wire size.

    In general, the fuse will be sized to protect the smallest wire in the entire circuit. If your fan were failing and drawing too much current, it should have blown the fuse before affecting any of the wiring components.
     
    thorn likes this.
  11. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    12,662
    San Carlos, CA
    Full Name:
    Mitchell Le
    #11 yelcab, Oct 30, 2018
    12 volts into 0.4 ohm is 30 amps. Your fan is done. If you open up the passenger footwell, you will notice that the fuse board is melting at that fuse location. Don't wait, change the fan now before you pay for the expensive fuse board. $120 for a fan. Change both fans. They are the same age.
     
    flash32 likes this.
  12. RedNeck

    RedNeck F1 World Champ
    Silver Subscribed

    Jul 8, 2016
    10,017
    The CSA
    Full Name:
    Me
    #12 RedNeck, Oct 30, 2018
    Damn near a short...I agree, replace the fan before it eats itself or worse....
     
  13. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    12,662
    San Carlos, CA
    Full Name:
    Mitchell Le
    #13 yelcab, Oct 30, 2018
  14. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #14 scowman, Oct 30, 2018
    Thats’s ugly! Thanks. I will check into that. Will run resitnace on the other fan as well.
     
  15. flash32

    flash32 F1 Veteran

    Aug 22, 2008
    5,686
    Central NJ
    Full Name:
    Dominick
    #15 flash32, Oct 30, 2018
    Instead of resistance .maybe consider putting a mulitmeter in circuit to determine amps as it turns on as well as running .. I think that would give you a more accurate power draw



    Sent from my moto x4 using Tapatalk
     
  16. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #16 scowman, Oct 30, 2018
    Might try that tomorrow. I got 0.1ohms on the 12" fan. Only 0.2ohms on the 16" this afternoon.

    are these the correct part numbers for the spal fans for the 456? I know I'm changing it up here:

    Image Unavailable, Please Login
     
  17. Streetsurfer

    Streetsurfer Formula Junior

    Dec 16, 2015
    934
    near Chicago
    Full Name:
    Ron
    #17 Streetsurfer, Oct 30, 2018
    Check the ground.
     
  18. fatbillybob

    fatbillybob Two Time F1 World Champ
    Consultant Owner

    Aug 10, 2002
    26,427
    socal
    #18 fatbillybob, Oct 30, 2018
    Don't forget the wiring ultimately goes back to the wonky electrical relay box. Open that up for a real surprise. All Ferraris should be retrofitted to get the fans off the electrical box. The wiring is marginal for the fans especially as they age. There are almost universal burnt connections over the entire fleet for all years of Ferrari.
     
  19. Cribbj

    Cribbj Formula 3

    Jan 1, 2011
    2,295
    Cooke City MT, The Coolest Small Town in America
    Full Name:
    John
    #19 Cribbj, Oct 30, 2018
    +1 to FBB's post. Get all the high current consumers off the main fuse/relay board. Ferrari engineers have SFB when it comes to electrical stuff.
     
  20. JCR

    JCR F1 World Champ
    Silver Subscribed

    Mar 14, 2005
    10,017
    H-Town, Tejas
    #20 JCR, Oct 30, 2018
  21. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    25,148
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #21 Steve Magnusson, Oct 30, 2018
    Last edited: Oct 30, 2018
    +1 -- doing a V=I*R calculation on an electric DC motor (at 0 RPM) only represents the initial inrush current (and that only lasts for a very short time). When the motor is actually running, it will generate a back EMF that greatly reduces the effective V and lowers the current I. (Melting at the fuseblock is caused by I^2*R heating more from a small unwanted resistance in the contacts at the fuse ends rather than a higher constant motor current. A higher constant current wouldn't help, but it can't increase much as this will blow the fuse - i.e., the constant current could maybe increase 1.5X without blowing the fuse, but the unwanted contact resistance can increase by a factor of 50~100X.)
     
  22. scowman

    scowman F1 Rookie

    Mar 25, 2014
    2,510
    Scottsdale AZ
    Full Name:
    Stu Boogie
    #22 scowman, Oct 31, 2018
    You all make some very good points. My wrap around amp meter is not working so I will need to get another to test the current draw.

    I’m going to install some relays regardless of the results to get the fans off the circuit board. I think I will run it off the alternator terminal with respective fuse lines. Not too far of a run for either fan.

    Will report back amp draw when I can.
     

Share This Page