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Cigarette lighter doesn't work when dimmer is fully on

Discussion in 'Stock 1991 - 1994 Explorers' started by LighterTom, October 30, 2012.

^^Searches ExplorerForum.com^^

  1. LighterTom

    LighterTom New Member

    October 29, 2012
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    I have a 91 ford explorer. I recently had to change the headlight switch because part of the connector burnt (specially around pin B2/A on diagram). I also changed the connector. Both of them are now brand new.
    Now my cigarette lighter stops working when I turn the dimmer on (either on low or high beams). Everything was fine a few weeks ago.
    I checked the fuse (20A) and it's good.

    So I measured some voltages.
    When lights are off, I get around 14.7V at the cigarette lighter.
    When lights are on and dimmer on lowest setting, I get around 9.7V.
    Then when I turn the dimmer on a little bit, I get 7V.
    I eventually get 0.8V when the instrument light is fully on.

    Here are my questions:
    What is the output voltage of the cigarette lighter? 12V? 14V? 10V?
    Can I damage my gps or phone if I plug the charger when I get 14V or 10V?
    What's wrong? What should I check? Maybe I can measure other voltages and let you know.
    Should I change the "dimmer/flash to pass switch"? Both left and right turn signals are good though.

    For the body wiring, see link below:

    Thanks a lot,
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  3. huntman58

    huntman58 Active Member

    February 13, 2007
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    City, State:
    Fremont calif.
    Year, Model & Trim Level:
    2013 Dodge Advenger
    Question did you find and fix what made the headlight switch connector burn? I am betting you felt it was just the switch and so just replaced it.

    That said its sounds like you may have had a wire or two that got hot melted the insulation and are now cross feeding. I get battery voltage at my lighter. a possible location for this cross may be right by the ash try as there is a dash light there and the lighter wires also so being there at lest thats were I would start and then work back to the switch.
  4. koda2000

    koda2000 Explorer Addict

    September 2, 2011
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    voltage at the lighter s/b battery voltage (12+ to 14+). it sounds like somehow you lighter socket is getting it's power from your light switch. you could figure it out, but i'd just run a new wire (with an inline fuse) straight from the battery to the lighter.

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