#10 fuse blows trying to start | Page 2 | FerrariChat

#10 fuse blows trying to start

Discussion in 'Mondial' started by Gossimer, Mar 27, 2016.

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  1. Alden

    Alden F1 Rookie
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    Central Florida
    #26 Alden, Mar 31, 2016
    Last edited by a moderator: Sep 7, 2017
    My list from Afterburner echos the OP's ID for the #10 fuse.
    Alden
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  2. Wade

    Wade Three Time F1 World Champ
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    #27 Wade, Mar 31, 2016
    Last edited by a moderator: Sep 7, 2017
  3. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    #28 Steve Magnusson, Mar 31, 2016
    Last edited: Mar 31, 2016
    Actually, both are correct. The apparent difference is just caused by there not being a fuse in position #1, and they did the fuse naming differently:

    In the wiring diagram:
    fuse position #1 (empty) = not labeled
    fuse position #2 = fuse #2
    fuse position #3 = fuse #3
    and so on...

    In the OMs:
    fuse position #1 (empty) = not labeled
    fuse position #2 = fuse #1
    fuse position #3 = fuse #2
    and so on...

    i.e., fuse #10 in the wiring diagram = fuse #9 in the OMs (but both are in fuse position #10)
     
  4. Jeka

    Jeka Formula 3
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    #29 Jeka, Apr 1, 2016
    Last edited by a moderator: Sep 7, 2017
    If you have an Ohmmeter (lowest ohm range) you can do some measurements. With fuse 10 removed and the ignition off you can start with measuring the resistance:

    1. Between connector Y pin 9 and ground (blue arrow, connector V pin 8)
    2. Between connector W pin 10 and ground (blue arrow, connector V pin 8)

    It is a relative simple circuit so I think we can find the cause by doing some measurements.
    If you can do this, please let me know the results of the measurements.
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  5. Gossimer

    Gossimer Rookie

    May 5, 2013
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    Melbourne, FL
    Results:

    1. Between connector Y pin 9 and ground (blue arrow, connector V pin 8) - No Reading
    2. Between connector W pin 10 and ground (blue arrow, connector V pin 8) - 46.1
     
  6. Alden

    Alden F1 Rookie
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    Jeka steps up again, wonder if this thread will go to 300 posts?
    Alden
     
  7. Jeka

    Jeka Formula 3
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    :) I expect not, this one is much easier (I hope :))

    The readings are ok, the conclusion is that the thermoswitch and the auxiliary starting assembly are ok.

    Just to be sure: "no reading" means infinite, not zero?

    If you switch the ignition on, relay v is activated, this activates relay i and this activates relay t (fuel pump relay) by fuse 10. So I suspect relay t to be faulty. I assume fuse 10 won't blow when you remove relay t and keep relay i and v installed.

    If you have removed relay t, you can measure if it is faulty with your ohm meter. Please perform the following measurements (ignition off):

    1. Measure between terminal 85 and 86 of relay t, the resistance should be low but not zero.
    2. Measure between fusebox (at the connector of terminal 85 of relay t) and ground (blue arrow, connector V pin 8)
     
  8. Bell Bloke

    Bell Bloke Formula 3

    Dec 6, 2012
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    I love it when Jeka gets going...;-) science in action....
     
  9. Jeka

    Jeka Formula 3
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    Thanks, it is fun to find the cause :)
     

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