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Mondial ignition switch removal - Again

Discussion in 'Technical Q&A' started by NC Mondial, Feb 20, 2005.

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  1. NC Mondial

    NC Mondial Formula Junior
    Silver Subscribed

    Sep 6, 2004
    356
    Raleigh, NC
    Full Name:
    Paul Stahl
    #26 NC Mondial, Mar 5, 2005
    Miltonian,

    In the last picture a couple of posts back you can see the top side of the contacts. In that pic look closely and you can see several small bars running between the contacts. Those bars are spring loaded and when in the "off" position are pushed down by small posts actuated by the switch.

    In my case the contact on one of one of those bars was burned. I took the bar out and using a small file and some very fine sandpaper cleaned both the bar and its mating contact pad. I then temporarily clamped everything back together, plugged everything back up and cranked the car. Problem was cured.

    The fix is not all that hard really. The most difficult thing, aside from getting the two halves of the unit permanently back together, was pulling the wires through the housing during the removal phase.

    The contact pads within the switch, to my way of thinking, are way too small, smaller than the head of a straight pin. Not really big enough to carry the load expected of them. In contrast, the contacts in the ignition switch of my TR-6 are almost the size of a pencil eraser and they carry FAR less electrical load.

    Paul
     
  2. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
    Full Name:
    Stefan
    #27 Ritter Rost, Jun 15, 2025
    My ignition switch got roasted, I had a short to ground (please don't ask why) and cannot even turn the key anymore. This plastic is melted, and I wonder if I can use any alternative part. Does anybody know if this part is used in a FIAT or Alfa Romeo or whatever vehicle?
     
  3. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,044
    USA
    #28 f355spider, Jun 15, 2025
    If new is too expensive, how about used?
    https://www.ebay.com/itm/205404249171?_skw=162548+ferrari&itmmeta=01JXTQBJS3BV14E3DT24VWSV65&hash=item2fd30c1c53:g:dmIAAeSwsHln-SJ5&itmprp=enc%3AAQAKAAAA0FkggFvd1GGDu0w3yXCmi1d0qwZWBx1UCjJVBDq9x5VRNLiAc7v3XaezyLIw9pPQKPN33FfiJI9PtBuuTNwPokP9TCnrHQa2nFhmHztNBrDBja7QroIUV6rr%2BwdDflu%2BVGNfLT2omQw06sM%2FwukVc%2BdT%2F9m162OdHG2cx0fkQlAZ3cRmf5yTnoy%2B2kNvQtU202lzsMTdtxLXpwHlN8OUkYOl1Ntc%2BoDzBNM8j7EmA5zqqbtUawCsNI1XlpzjBdsM%2FUP5Izhm%2BRLL0C8i67idv8M%3D%7Ctkp%3ABk9SR9KsrtfuZQ
     
  4. JimboMondial

    JimboMondial Karting

    Dec 26, 2005
    73
    Portsmouth UK
    Full Name:
    Jim
    #29 JimboMondial, Jun 16, 2025
    or a Alfa Romeo switch.

    https://www.ebay.co.uk/itm/127141856272?_skw=alfa+romeo+ignition+switch&itmmeta=01JXVZ2BXKWMTW8E09CDT0S1RH&hash=item1d9a3ec410:g:4JAAAOSwx2VoMhC2&itmprp=enc%3AAQAKAAAA4FkggFvd1GGDu0w3yXCmi1eI7CGgItcMP7aybQfya%2F7uoSltf3mRvQCwUvruMCdjazkIy2mXWrOm0g%2B24hWlgHhzMoULb1bQSGVq2UG2PPmHD%2BnUpVuYjMwLxUcOFn9Dk3KKFScG8BfskPTn%2BY5Q2EYXyGHDPQzJ5mVIylopyRpBVFb8lWi1EJ12V1anFXMVBjLNY1Rkq5JRddZhTnwV%2FJ5z%2BIj5Y0UjIBEbFkiVsoIU7qOp4RvJ3P00l8rhAfwXUoShGyqfju8k%2FFs9Mf1Tc%2Bh%2F4ZXqooK92X%2BNjw7BQeTn%7Ctkp%3ABk9SR4i_if_uZQ
     
  5. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
    Full Name:
    Stefan
    #30 Ritter Rost, Jun 16, 2025
    JimboMondial, f355spider and theunissenguido like this.
  6. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
    Full Name:
    Stefan
    #31 Ritter Rost, Jun 23, 2025
    Before you order the switch from the Alfa Spider (80 - 93) + GTV6 + 75 please be aware that the hardware is pretty identical to F355, but the electric switch on the backside of the lock is completely different.
     
  7. theunissenguido

    theunissenguido F1 Rookie
    Owner Silver Subscribed

    Jan 21, 2004
    2,664
    Argent/Brasil
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    Guido
    #32 theunissenguido, Jun 23, 2025
    So, can you use that Alfa switch ? With an other electric switch back in place ?
     
  8. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
    Full Name:
    Stefan
    #33 Ritter Rost, Jun 23, 2025
    Theoretically yes, but the issue is to find the correct electric switch back. The one from Alfa Spider (80 - 93) + GTV6 + 75 does not fit to F355.
     
  9. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
    Full Name:
    Stefan
    #34 Ritter Rost, Jun 23, 2025
    So far is was able to start the car with the Alfa Romeo switch:

    cable coding (Alfa / Ferrari)

    red = red
    green = white
    black = blue / black
    blue = blue

    Image Unavailable, Please Login

    The strange thing is, I can start the engine, but gauges, electrical seats, roof and AC don't work. And the engine does not shut off, even if I pull the key.
     
    f355spider and theunissenguido like this.
  10. JimboMondial

    JimboMondial Karting

    Dec 26, 2005
    73
    Portsmouth UK
    Full Name:
    Jim
    #35 JimboMondial, Jun 24, 2025
    Stefan,

    your going to have to test the connections of the ignition switch with a meter with the key in different positions, what your looking for is:-


    key off /out

    No connection

    First post/ detent
    Only 2 wires connected

    Running/second detent
    3 wires connected

    Start spring back /third detent
    all 4 wires connected

    regards

    Jim
     
  11. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
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    Stefan
    #36 Ritter Rost, Jun 24, 2025
    Jim, many thanks. If I compare your information with what I've measured at the Alfa ignition lock, this is the result:

    Image Unavailable, Please Login

    Strange, I did not find any first post (ACCY) on the Alfa ignition lock. This may explains why dashboard, AC and seats don't work while the engine is running. The question is, can I bridge RUN and ACCY to solve this issue, or do I create another problem?
     
    f355spider likes this.
  12. Ritter Rost

    Ritter Rost Rookie

    Aug 15, 2020
    36
    Germany, Bavaria, city of Passau
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    Stefan
    #37 Ritter Rost, Jun 24, 2025
    Update and obviously the solution how to make the Alfa switch work:

    Image Unavailable, Please Login

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    I bridged blue and black to supply ACCY with voltage.

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    Engine is running, and can be shut off (that was my problem yesterday).

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    All gauges and AC are working now. No warning lights! I think that's pretty much it.

    Next project: Try to repair my original F355 ignition lock with a Fiat Ducato (1994) switch.
     
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