[DML] Re: Funny oil light behavior

["Tell you if you ask." <racuti1@xxxxxxxxxxxx>]

My fan light does this too. I haven't replaced the binnacle lights 
with LED's yet. It's simply a result of stray current and/or 
induction being emitted into the wires from other systems. It may, 
but does not necessarily indicate a short.

Why do LED's do this yet incandescent bulbs don't? Because LED's 
require only a fraction of the current to make them light. The old 
bulbs probably had this electrical "pressure" on them as well, but 
it wasn't enough to overcome the resistance in the filament required 
to make it glow.

I can see why it would be annoying. Perhaps a very low resistance 
resistor or a standard diode of the proper rating wired in series 
with the LED would dampen this residual current.

Hopefully someone will come along and add to this or correct me.

Rich A.
#5335

--- In dmcnews@xxxxxxxxxxxxxxx, Jeremiah Montee <angelito03299@xxxx> 
wrote:
>
> Ok, here's a new one.
> 
> All my binnacle lights except the battery light are
> LEDs.
> 
> I'm driving along the interstate and I signal a right
> turn to get off on an exit.  As I do, I notice my oil
> light starts to illuminate.  It's not sudden and
> instantaneous, it's very slow as if someone's winding
> a wheel to give off the light.  It never even gets
> completely lit, but it's bright enough to notice out
> of the corner of your eye.  I see it, check my oil
> gauge; I'm at the little tick right below "80". 
> Engine seems stable, no overheating whatsoever.  I
> turn off my turn signal; the oil light starts to
> decline in brightness.  I noticed that if I turn my
> left turn signal - nothing - but as soon as I use my
> right turn signal this seems to happen.  If I
> disengage the headlight switch entirely, the oil light
> appears to go out too; it doesn't linger on.
> 
> I've seen this behavior with the "cooling fan fail"
> light as well with an LED in place.  Anyone have any
> ideas?  Is it something to do with the wiring of the
> car or the "paper circuit board" behind the instrument
> cluster?  I guess I've never noticed it until tonight,
> who really knows how long it's been doing this.  It
> doesn't really scare me, but I thought it was weird to
> say the least.
> 
> Jeremiah
> 
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