Help 84 308 Hot Wire Bottom #3 | FerrariChat
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Help 84 308 Hot Wire Bottom #3

Discussion in '308/328' started by PCosta, Sep 17, 2009.

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  1. PCosta

    PCosta Rookie

    Mar 15, 2004
    35
    Metro Detroit
    #1 PCosta, Sep 17, 2009
    Last edited by a moderator: Sep 7, 2017
  2. CaptOharry

    CaptOharry Formula Junior

    Jan 4, 2009
    763
    Green Cove Spgs FL
    Full Name:
    Harry Welch
    #2 CaptOharry, Sep 17, 2009
    It's the same on my 82.The fuel pump fuse has allways been hot to the touch,since i've owned the car.I've pulled the fuse and pushed down on the contacts,now not as hot.Gonna have to get a birdman fuse block!
     
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,826
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #3 Steve Magnusson, Sep 17, 2009
    Last edited: Sep 17, 2009
    Because the CIS fuel pump current is very large (like ~10A) -- consequently, the I^2*R heat generated at the connections can be significant even for a very low resistance.

    I note in your photo that the female wire terminal on the beige wire at the bottom of fuse #3 has been replaced with a "cheapy" crimp-on style replacement -- you might consider soldering this connection (between the wire and the female connector) to reduce its resistance (and the heat generated there).
     
  4. miketuason

    miketuason F1 World Champ
    Owner Silver Subscribed

    Feb 24, 2006
    15,811
    Cerritos, CA.
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    Mike
    #4 miketuason, Sep 17, 2009
    You might want to consider changing/upgrading your fuse box.
     
  5. Paul_308

    Paul_308 Formula 3

    Mar 12, 2004
    2,345
    #5 Paul_308, Sep 17, 2009
    Last edited: Sep 17, 2009
  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,826
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #6 Steve Magnusson, Sep 17, 2009
    That left fuseblock in the photo looks like it is one of Birdman's type already.
     
  7. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
    Owner Rossa Subscribed

    May 4, 2001
    36,439
    Birmingham, AL
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    Tommy
    #7 Dr Tommy Cosgrove, Sep 18, 2009

    that one is updated
     
  8. spiderseeker

    spiderseeker Formula 3

    Jul 22, 2005
    1,718
    Colorado
    Full Name:
    Steve
    #8 spiderseeker, Sep 18, 2009
    Steve is right, solder the terminal to the wire to reduce resistance and change the other fuse block to Birdman's as well.
    (You should change the 25 year old relays too, if you haven't already done so. about $100 total from Rockauto.com)
     
  9. LarryS

    LarryS Formula Junior

    Nov 14, 2003
    302
    Fremont, CA
    Full Name:
    Larry S
    #9 LarryS, Sep 19, 2009
    Last edited by a moderator: Sep 7, 2017
    my 1984 fuel pump fuse was also very hot.
    it would really burn your finger!

    I checked it, 215 degrees with car running (too hot!).

    1st, I cut off the connector and kept cutting back the wire
    until the green corrision was gone, took about an inch, there
    was plenty of length available. (top pic)

    2nd, I installed a new connector (a high quality one, not from home depot)
    and soldered it. Now 155 degrees with car running. (mid pic)

    3rd, I polished the spade coming from the fuse box and the contact area of
    the fuse and applied some electrical conductivity paste.
    Now 115 degrees when driving. (bot pic)

    It's been about 2 years since I did this, everything is still great.

    Larry
    Image Unavailable, Please Login
     

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