LED dome lights always on... - Nissan Xterra Forum
 
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post #1 of 8 Old 04-05-2011, 09:06 AM Thread Starter
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LED dome lights always on...

Hey guys...a few days ago i installed some LED lights in the X, one in the dome light housing above my head, and another in the rear light housing in the cargo area....i noticed that the lights work well, and are extremely bright....but they never cut completely off. It's not really noticable during the day, but at night they are clearly always glowing a bit....is this normal? will it kill my battery? here's a link to the lights i put in....


http://cgi.ebay.com/ebaymotors/2x-31...Q5fAccessories
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post #2 of 8 Old 04-05-2011, 09:28 AM
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not normal at all

don't see how it could be the bulb, likely a problem with the circuit that you never noticed with the old bulbs...

i doubt it will kill your battery, at least not overnight...LEDs draw a very low current...i've left my LED map lights on overnight, both sides, and still showed 14 volts on my volt gauge when i put the key in
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post #3 of 8 Old 04-05-2011, 09:33 AM Thread Starter
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I put the old bulbs back in to see if that was the case of me not noticing them being on....and they cut off like they're supposed to....and after about an hour and a half i went back out to check on the LED's....and they had finally cut completely off? So they DO cut completely off but after an hour or so....
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post #4 of 8 Old 04-05-2011, 09:36 AM
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It has to do with the resistance on the line. Sometimes
the dome light delay circuit or some other part leaves a small voltage on the line that isn't even for a normal bulb to glow, but a more sensitive LED may.

This actually happened in my friends 2001 VW Golf. He replaced his brake lights/tail lights with some LEDs... and it caused his 3rd brake light, which was a stock LED strip, to always glow faintly (well bright enough you could notice if the sun wasn't shining hardcore).

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post #5 of 8 Old 04-05-2011, 09:39 AM
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Ha ok so it was my first initial thought. The timer for the dome light must be based off of a capacitor charge rather than something like a 555 timer chip.

Since an LED pulls a lot less current than your normal bulbs, the capacitor will take a lot longer to discharge meaning your lights will "stay on" a lot longer

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post #6 of 8 Old 04-05-2011, 09:44 AM
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Quote:
Originally Posted by rjr162 View Post
Ha ok so it was my first initial thought. The timer for the dome light must be based off of a capacitor charge rather than something like a 555 timer chip.

Since an LED pulls a lot less current than your normal bulbs, the capacitor will take a lot longer to discharge meaning your lights will "stay on" a lot longer

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This. LED's have so little resistance compared to an incandescent bulb, and your dome light timer is indeed capacitor based. You can either live with it as is, It won't kill your battery any more that the old bulbs would have, or install a properly sized resistor inline withe the dome light circuit. Personally, I'd leave it as is, unless the the faint glow at night interferes with your ability to see out of the vehicle.

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post #7 of 8 Old 04-05-2011, 10:02 AM
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My LED dome lights are wired to an incandescent bulb and I have had no problems.

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post #8 of 8 Old 04-05-2011, 10:17 AM Thread Starter
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thanks for the help guys....it doesn't effect my visibility to see at night, and if it doesn't drain the battery any more so than the incandescent bulbs....i won't worry with it. Thanks again for all of the info guys.
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