Light dimmer reostat repair needed | FerrariChat

Light dimmer reostat repair needed

Discussion in 'Maserati' started by Iceblue, Jan 12, 2013.

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  1. Iceblue

    Iceblue Formula Junior

    Nov 5, 2012
    424
    Virginia Beach
    Full Name:
    Olivier Perault
    I have a reostat light dimmer that is in need of repair.
    The light dimmer reostat wire is all bunched up and is over heating.

    It would seem very easy to repair. However I have never done one before.

    Is there some one out that that might know of some of a good repair person?

    Maybe and old radio repair shop might do it?
     
  2. 3500 GT

    3500 GT Formula 3

    Nov 2, 2008
    1,468
    USA
    Full Name:
    Gentleman Racer
    That's an easy repair. Where are you located?
     
  3. William Abraham

    William Abraham Formula Junior

    Nov 21, 2010
    830
    London, UK
    Full Name:
    William Abraham
    Tell us all the details. I think this is a common fault in the 102 also
     
  4. thecarnut

    thecarnut F1 Rookie
    Rossa Subscribed

    Apr 22, 2006
    3,198
    Atlanta
    Full Name:
    The Car Nut
    The dimmer is really not needed as even in its brightest setting the lights are too dim. An easy solution is to put a jumper across the dimmer. That way the switch is eliminated electrically from the circuit and the lights will be at their brightest .... which will still be very dim :)

    Ivan
     
  5. William Abraham

    William Abraham Formula Junior

    Nov 21, 2010
    830
    London, UK
    Full Name:
    William Abraham
    Good idea. I have never got one to work anyway. I'll be happy to get the dash lights to stay on.
     
  6. F456M

    F456M F1 Rookie

    Jan 8, 2010
    3,696
    Oslo
    Full Name:
    Erik
    Why not just buy a new one? Should be possible to get the knob to fit most std ones, or you can get it from Maserati if they have one. Tried MIE? I ordered from them last week, and they had everything. Takes 5 days, and they arrive at my door in Oslo!! And cheap too.
     
  7. staatsof

    staatsof Nine Time F1 World Champ
    Silver Subscribed

    Mar 13, 2005
    95,383
    Fuggetaboutitland
    Full Name:
    Bob
    When I first got my Bora I was looking to do the same thing and could never get the dimmer out of the dash. I just bypassed with the same exact results as Ivan. Dash lighting sucks in these cars.

    I did look into getting some brighter bulbs to put in the gauges but never finished the investigation. With those you would need a working rheostat. I would think that today there are More options like LED?

    Now if I could just keep the condensation out of the gauges as well ...

    I've got two different marques of cars that do this on the same brand of gauges.
     
  8. staatsof

    staatsof Nine Time F1 World Champ
    Silver Subscribed

    Mar 13, 2005
    95,383
    Fuggetaboutitland
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    Bob
    LOL :D They work on a percentage basis ...
     
  9. VeloceOne

    VeloceOne Karting

    Jul 18, 2007
    87
    Hi, For older cars with poor dash lighting, I have often wondered about using Fiber Optics in place of the bulbs. I have little knowledge of this, but at first glance it would seem to be an option. The problem with larger output bulbs seems to be heat, and I don't think that would be so with fiber optics...........Suggestions?
     
  10. GLB

    GLB Formula Junior

    Oct 27, 2010
    311
    Dallas, TX
    Full Name:
    George Lawrence Brantingham
    Fiber optics would be tough to install - you'd be replacing wired sockets with a not-too-flexible fiber cable which you'd then have to hold in place. I suspect the light output would be pretty directional unless you can find a diffuser to terminate the cable.

    LEDs might be a better option and there's a chance that there's a direct bulb replacement available. Dialight and Chicago Miniature Lighting make a range of them. LEDs are more efficient that incandescent bulbs so greater light output is possible without generating more heat. There are lots of variants of "white" LEDs (really blue with a yellow re-emitting phosphor) including "warm white" that approximates incandescent appearance. If you want colors other than white, red, amber, green and blue are available.

    The last time I drove my Bora at night, the alternator couldn't keep up with the radiator fans and headlights, so I was more concerned about reaching home than the dash lights, but as I recall, they weren't great. Maybe that will be the next project.
     
  11. Iceblue

    Iceblue Formula Junior

    Nov 5, 2012
    424
    Virginia Beach
    Full Name:
    Olivier Perault
    #11 Iceblue, Jan 13, 2013
    Last edited by a moderator: Sep 7, 2017
    I finally got my dimmer switch back in good running order with the help of my friend.
    The wire used on this vintage dimmer is quite unique.

    Here I tough I could used just any plain coper 30 gage wire!

    The wire that is used here is not something you can find at your local Radio Shack, it has a resistance of 13 owms end to end.

    I managed to rewind the thing back up the way it was made back in the 60's
    Word of advise if yours no longer works.... make sure you keep as much wire as you can...
    It's key to get this baby running again.

    My light are nice and bright again : )
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  12. Quattroporte3

    Quattroporte3 Formula 3

    Nov 13, 2010
    1,060
    Bright as in (original) dim, or really bright?

    :p
     
  13. Iceblue

    Iceblue Formula Junior

    Nov 5, 2012
    424
    Virginia Beach
    Full Name:
    Olivier Perault
    Much Brighter

    The bulb are nice enough where I can read all the gauges.
    If you disconnect the wire going to the dimmer switch the voltage should read near 11 Volts

    If you test your dimmer on the owm meter the lowest resistance you will get at the beginning of your coil is 2 the other side of the coil should be near 13 or 14

    If your lights are too dim I suspect that you your dimmer copper contact are touching at the low end and the high end at the same time causing a short.
    There should only be one contact touching from 1 - 6 the front contact should touch and 7 - 13 using the be touching.
     
  14. hans2

    hans2 Karting
    Silver Subscribed

    May 11, 2011
    120
    Charlotte
  15. Iceblue

    Iceblue Formula Junior

    Nov 5, 2012
    424
    Virginia Beach
    Full Name:
    Olivier Perault
    Wow what a find.
    Thanks Hans....
    That is a great find.
    Olivier
     

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