Mondial T Battery Change Issues

Discussion in 'Mondial' started by Malepa, May 3, 2020.

  1. Malepa

    Malepa Rookie

    Jul 16, 2011
    I hope everyone is well amongst the chaos of the Covid Crisis.

    My car (Mondial T 1990) has suffered a dead battery due to lack of use since the lockdown began so I took on the project of changing it last weekend.

    That seemed to okay once the wheel was off and I was able to get into the wheel arch. The car now starts on the button and the engine runs just fine. However, I've now got some weird behaviour with the electrics that I need on advice with please.

    The following ancillary functions have now stopped working (completely, i.e. no relays clicking or any other behaviour). The central locking, windows, radio, lights, boot release and lights have all ceased working. Even the hazard warning flashers have stopped working. However, the immobiliser, front trunk, wipers, indicators and air conditioning are all working fine.

    It's a bit of a head scratcher, NONE of the fuses have blown and I've clean the battery terminals to try and make sure that it wasn't just a bad earth but to no avail.

    Any idea what might be causing this please? Thanks
    paulchua likes this.
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  3. Wade

    Wade Three Time F1 World Champ
    Rossa Subscribed Owner

    Mar 31, 2006
    East Central, FL
    Full Name:
    Wade O.
    Aftermarket immobilizers... always a problem.
    Cadillacbart likes this.
  4. JimboMondial

    JimboMondial Karting

    Dec 26, 2005
    Portsmouth UK
    Full Name:
    Odd one, electrical contacts of the ignition switch ie position 1 lights position 2 headlights position 3 start? Bit of a guess.


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  5. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    Full Name:
    Steve Magnusson
    There are two fairly large red cables that bring +12V power from the battery to the fuse-relay panel. First thing to do is just unplug/inspect/reseat the connector for those cables (it has two large spade connectors). Your WSM schematic shows that there is a sort of junction block (near the battery I think) connected to the + terminal of the battery by one really big red cable where these two fairly large red cables originate -- probably come bolted connections there that you can check for cleanliness and tightness.
  6. paulchua

    paulchua Cat Herder
    Moderator Owner

    Jul 1, 2013
    Menlo Park, CA
    Full Name:
    Paul Chua
    Make sure to check the overall health of the battery as well. Sometimes fully discharged batteries can become less then optimum and cause all sorts of electrical gremlins.
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