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Faulty bulb light always on EXCEPT when braking?!? 200

uid 42913's pic
posted by  matthew02144 on  Sat Mar 8 14:29 CST 2008
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last visit: Sat Jul 10 15:02 CST 2010
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The light that alerts the driver that a light is out is constantly on while driving. It does go out whenever the brake is applied however, but comes back on as soon as my foot comes off the pedal.

I have checked all the bulbs and everything seems to be in working order. Anyone had an experience like this before?
--
1993 240 Wagon with 93,700 miles 2001 S40 with 71,000 miles








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    Faulty light in dash that tells you if a bulb is out? 200

    posted by  Texas745 on  Sat Mar 8 14:40 CST 2008
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    last visit: Sun Jun 20 10:40 CST 2010
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    I have heard faulty grounds blamed for this problem
    I believe, also, that if there is sufficient difference in resistance between the two bulbs on either side of a set, this can happen. (they need to match).
    I think this thing works like a Ground Fault Circuit Interrupter (GFCI)in a home circuit. If there is an imbalance of current returning from one side of a particular circuit the thing is activated. So, just for kicks, get a new set of bulbs. (Do all three and be a big shot.) Then check your grounds for poor connections that may cause higher resistance on one side.







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