[Vwdiesel] Miser's monitoring method for Glow plugs

Roger Brown r.c.brown at ieee.org
Tue Dec 21 16:48:47 EST 2004

Mike & Coreen Smith wrote:
> Mark,
> huh?
> How can soldering an LED to each glowplug prove the glowplug is working?
> All that you'll do with 12V is smoke the LED instantly.  Even if it was an
> internally ballasted
> LED, (or one you add a 500Ohm to 1KOhm resistor to) is prove you have
> voltage AT the glowplug.
> You haven't proven current flow........which is a different animal
> altogether.
> Unless I am misreading your post.......which is possible.,........I've had
> an incredibly hard day and
> am stressed. (personal stuff)
> I am interested in the idea you are trying to convey....please elaborate.
> Mike
> Mike, Coreen & Corey Smith
> 699 Rte 616 Keswick Ridge
> NB
> Canada
> E6L 1T1

My plan is to use an amplifier to sense the voltage drop to each plug and use that to drive the LEDs.  This will reliably
indicate that current is indeed flowing to the glow plug, not just that voltage is present.

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