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Parking light and brake lights on at the same time 200

posted by  JChis2 on  Tue Oct 19 17:15 CST 2010
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last visit: Tue Nov 29 09:59 CST 2011
[RELATED]

After cleaning the connections with emery cloth all of my taillights on the 91 240 sedan are working again. Sort of…

My “light out indicator” is STILL shining bright!!!

AND NOW…

When I have the parking lights off, I put pressure on the brake pedal and both of my brake lights come on, as well as the third brake light. HOWEVER, when I turn on the parking lights/driving lights the brake lights light up too, but not the third light, only when I add pressure to the brake will the deck light activate.

What would cause both of my brake lights to come on with the parking lights? The bulbs are placed in the sockets correctly and the sockets are connected correctly.

WHAT DID I DO WRONG???

Living in Texas my car will not pass a safety inspection until the lights are working correctly and the dash light is out.








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    Parking light and brake lights on at the same time 200

    posted by  Will740turbo on  Tue Oct 19 17:46 CST 2010
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    last visit: Wed Oct 22 16:09 CST 2014
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    You might check the grounds for the parking lights. If they are not grounded properly, they may find a shorter path to ground by going through the brake lights. I think you can create new grounds for the parking lights, but you should find the problem, not just work around it.

    That bulb-out indicator is very sensitive. Some people even report that different bulb types will set it off. It measures load between the two sides and if they are uneven, will illuminate the dash light.

    To pass inspection, you can remove the bulb from the dash cluster for the day of the test, if fixing the tail-lights doesn't eliminate the bulb-out light.

    Someone here may be more versed in the system and able to tell you whether or not the bulb-out indicator "relay" can cause the brake lights and parking lights to ground through each other.

    Good Luck
    --
    1990 740 Turbo, on its way to stock specs, maybe beyond








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      Parking light and brake lights on at the same time 200

      posted by  Duck on  Wed Oct 20 02:25 CST 2010
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      last visit: Wed Apr 30 21:00 CST 2014
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      The "Big Red Round Relay" may be your whole problem considering the symptoms and age of your car. It is located above the drivers knees after you take off the bolster and carpet piece you should see it quite easily. It's a 'plug in' and costs between $50 - 80.
      Duck








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        Parking light and brake lights on at the same time 200

        uid 27's pic
        posted by  Art Benstein on  Wed Oct 20 02:45 CST 2010
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        last visit: Fri Oct 17 20:10 CST 2014
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        If the ground is missing, you won't think your brake lights are on, because the total light output of the two filaments in series is less than what the parking lamp alone would generate.

        The circuit board, the color-coded lamp sockets, and the dual filament bulbs can get confusing. A test light, a stick to hold the brake pedal, and a calm approach will be your best method to find where you went wrong.

        The bulb out relay, shown below, won't likely short the brake circuit to the tail light circuit, but the converse is definitely true: If you are turning on the brake lights by the parking light switch (because of a socket mismatch or incorrect bulb insertion) the overcurrent can fry the sensor's parking light windings.

        If the ground is missing, you won't think your brake lights are on, because the total light output of the two filaments in series is less than what the parking lamp alone would generate.

        I think this only happens once someone has exacerbated the situation by overfusing the parking lights (should be 8A fuses only in #15 and #16) but the result is this, and you end up with a false bulb failure indication.




        --
        Art Benstein near Baltimore

        We childproofed our homes, but they are still getting in.







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