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Old 08-13-2014, 09:55 AM   #1
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Interesting problem with LED bulb and light fixture

So I've been wanting to change over to led bulbs in my coach for a long time but wasn't sure what style/temp I should go with. I got a good deal on a pair of lumi rv 1141 "cool white" bulbs and figured I would try them in the ceiling fixtures to see if I liked the color and output.

The first fixture I installed a bulb in worked as expected but something strange happened with the second one I tried, the fixture was switched off but as soon as I pushed the bulb in it lot up completely then all but 2 leds went out. I switched the light on and it lit back up but when I switched it back off instead of going out it just dimmed. It works normally with an incandescent bulb and none of the other light fixtures do this.

Has anyone else experienced something like this?
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Old 08-13-2014, 10:08 AM   #2
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Bad bulb? Try a different bulb and see if it does the same thing.
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Old 08-13-2014, 10:11 AM   #3
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The bulb works fine in every fixture but this one, the other led I purchased does the same thing but only in this one fixture.
When I put the original incandescent bulb back in it works fine
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Old 08-13-2014, 10:27 AM   #4
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Possible bad ground??
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Old 08-13-2014, 10:33 AM   #5
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I would say bad switch. Normal bulbs require more power so not enough power to light bulb but current drain still there. When on off position the switch is still but barely making contact. Next time you turn it off try snapping the switch off. In any case I'll bet a new switch will solve your problem.
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Old 08-13-2014, 10:44 AM   #6
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Turn off any other lights in the area while doing the test. Disconnecting one wire from the switch should kill the light but if not it is time to get a digital voltmeter out and measure the voltage on each pin of the bulb. You need a good ground so grab an extension cord and use the ground lead to put one of your probes in. If you take those measurements and post them a better analysis will come.
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Old 08-13-2014, 11:49 AM   #7
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(+) pos and (-) neg feed to fixture my be reversed. Some LED's are picky about that, some are not.
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Old 08-13-2014, 02:17 PM   #8
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I agree with the bad switch suggestion.. The dome light in my car was missing when I bought it, I replaced it with an LED I picked up for.. Hold on to your wallet....$0.50,, Yes fifty cents (Close out) the dome light is computer controlled so it behaves exactly that way, Never fully goes out.

I would pull the fixture...... I think you may have a BUG (NO, not a defect but an insect) across the switch terminals. Or some other accidential poor connection. (Conductive grease Water, etc.)
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Old 08-13-2014, 02:48 PM   #9
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The bulb socket may be wired with reverse polarity.
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Old 08-13-2014, 04:38 PM   #10
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The light fixture is a Fleetwood "euro light" so I assumed the fixture was probably going bad. I haven't had a chance to test it but I hope it's a polarity issue and not a socket that starting to ground out. I figured I would find out if anyone else experienced a similar problem before I started shopping for a new fixture
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Old 08-14-2014, 11:11 AM   #11
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Odds are the hot and ground on the switch is wired backwards. LEDs are polarity sensitive and won't work with reversed wiring (but some better brands have internal circuitry to correct for that).
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