LED bulbs - automotive.

harley_Husky | 20:00 Mon 12th Oct 2009 | How it Works

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Hi all.
I'm trying to figure a way to limit the current to some LED side repeaters/markers on a bmw.
They work perfectly untill you turn the ignition off and they remain lit, albeit super dim.. i have a feeling that it is to do with BMW sending some kind of 'retentive' power to all bulbs, which is used to determine if you have a bulb blown, and thereby signify this on the dash.

Anyways, i digress... any ideas guys ??

many thanks.
eddie

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rccatnap

It's a reasonable thought that some power is still being applied to sense the infinitesimal resistance in the circuit, but before adding some other components to the circuit, you will need to be absolutely certain that in doing so, you will not be upsetting a balance in other circuits. Are you absolutely sure that they are really 'OFF' and you're not seeing some reflection from behind the LED? Which brings one to the obvious conclusion that you should really ask BMW.

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