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lessons learned using LED brake light bulbs 200


some years back, i replaced my 245 rear brake bulbs with LED 1157. they worked fine up to now.

i'm not sure how they failed. i recently had my hatch window replaced.

symptoms
1. with brake pedal depressed; parking, with parking lights off, engine on or off
a) front parking lights, side markers (wired to the parking lights) on
b) instrument panel lights came on
c) bulb out indicator came on
d) important--all 3 brake lights worked

2) with brakes depressed when parking or headlights on, engine on or off
a) no indication of problem
b) no bulb out on the dash
b) brake lights worked

after replacing with normal bulbs everything works as normal: with lights in off position, engine on, brake pedal depressed--no bulb out indicator, parking or instrument panel lights not coming on.

looking at both LEDs, i cannot tell which is the problem LED bulb.

summary
1. not sure what caused the failure
2. LEDs are more expensive but should last for 1,000s of hours
3. took hours to trace problem, symptoms are different than incandescent bulbs
4. i still think LEDs are worth trying
5. i may have LEDs in my 86 245 which would be still working.
6. normally, i log in my workbook just about everything i do, but i haven't found when i installed these LEDs yet, so i don't know at this time;

i don't document installing bulbs, so i may not have logged installing the LEDs.


regards,
byron golden
86 245
92 245
94 940














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    lessons learned using LED brake light bulbs 200

    You could try to test them by connecting a 12V DC source between the shell and either end contact. Trouble is, the LEDs themselves are reliable, but the assembly depends on connections internally, so the "bulb" reliability depends on how well it was assembled. So you might test it and find it is working, but it fails again when it gets warm or suffers ordinary mechanical shock.

    I have an early 60W-equivalent house current LED lamp which is intermittent. It will lose a portion of its array as it heats up causing a distracting flicker. The first task was to be sure it was the "bulb" and not a loose connection in the socket. Loose connections are a bigger problem in the automotive setting because of the lower voltage and resulting larger impact from contact resistance.


    --
    Art Benstein near Baltimore

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








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    lessons learned using LED brake light bulbs 200

    So the only problem was the 'bulb out' indicator in the dash? Unless I missed something in your symptom list, it looked like everything else worked.

    That is normal behavior for LED replacement bulbs. They draw too little current for the bulb checker circuit to be satisfied that all is well, so it concludes there must be a bulb out.

    This is relatively easy to fix with an inline resistor.








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      lessons learned using LED brake light bulbs 200

      hello ryan,
      not quite only the bulb out showing on the cluster. the front parking lights would come on too.

      maybe the resistor would take care of that too.

      any suggestions on resistors?

      thanks,
      byron







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