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250 Washer Pump testing and installation - any experience?

Discussion in 'Vintage (thru 365 GTC4)' started by gimmea250swb, Nov 26, 2019.

  1. gimmea250swb

    gimmea250swb Formula Junior
    Silver Subscribed

    Mar 8, 2007
    521
    Washington, DC
    Full Name:
    Taylor
    Dad asked me to check his 250 washer pump before he cleans/installs it. The two terminals closest to the plunger are normally closed and they open when the plunger is pressed. The rear terminals are normally open but when the plunger is pressed there is no change. Seems like they should close.

    How is the power connected when installed? The red/black wire in the photo has a connector that may attach to one of the mounting bolts in the back (as ground) and then attach to one of the terminals? Which terminal is positive?

    Thanks!
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  2. Motob

    Motob Formula 3
    Professional Ferrari Technician

    Nov 11, 2003
    2,144
    Berkeley, CA
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    Brian Brown
    The pump does not have a positive terminal. One terminal is connected to ground (through an wire that uses an eyelet terminal on one of the mounting bolts).
    The other terminal is connected to a wire from the wiper motor. When you operate the washer pump, it connects the two rear terminals together, causing the wiper motor to make a single wipe.

    Brian Brown
    San Francisco Motorsports
     
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  3. John Vardanian

    John Vardanian F1 Rookie

    Jul 1, 2004
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    John Vardanian
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  4. gimmea250swb

    gimmea250swb Formula Junior
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    Mar 8, 2007
    521
    Washington, DC
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    Taylor

    Thank you gents. So from your explanations and photos we've got a repair to do. The rear terminals do not connect when the plunger is pressed. I appreciate your help very much!
     
  5. enio45

    enio45 Formula Junior
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    May 16, 2004
    852
    Gilbert, AZ
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    Ed
    sounds like time to take it apart - probably some corrosion in there

    is this on the ellena car?
     
  6. gimmea250swb

    gimmea250swb Formula Junior
    Silver Subscribed

    Mar 8, 2007
    521
    Washington, DC
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    Taylor
    Hey there! No, it's a Lusso
     

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