[Vwdiesel] Re: Miser's monitoring method for Glow plugs (WithWraparound!!!)

[Shawn Wright]

I did some web searches on this, and found the Ford PS diesel uses a 
similar system, comparing the banks of plugs (using a shunt) and throwing 
a fault if the difference is greater than 8.5A (minimum 32A per bank is 
rated spec). The system also states that it does not do the check until glow 
plugs have been on for 30 seconds, stating it takes time to stabilize the 
resistance/current. I found mention of the Calif. models using a more 
advanced GP controller which identifies each plug with a code, but could 
not find details on how this is done.

On 21 Dec 2004 at 22:26, James Hansen <jhsg at sasktel.net> wrote:

> One other way to have a working/not working indicator would be an extension
> of the current vw tdi method of comparing the current flow of two plugs with
> the other two plugs.- Would need to have two plugs isolated from the other
> two plugs.  Diodes should do nicely.   A wire from each circuit of two plugs
> with a bulb in the middle should have the bulb light when one plug goes dead
> b/c of voltage drop as compared to the other set of two plugs.
> -James
> 
> -----Original Message-----
> From: vwdiesel-bounces+jhsg=sasktel.net at vwfans.com
> [mailto:vwdiesel-bounces+jhsg=sasktel.net at vwfans.com]On Behalf Of Mark
> Shepherd
> Sent: Tuesday, December 21, 2004 2:18 PM
> To: vwdiesel at vwfans.com
> Subject: [Vwdiesel] Re: Miser's monitoring method for Glow plugs
> (WithWraparound!!!)
> 
> 
> 
> ----- Original Message -----
> From: Mark Shepherd
> To: vwdiesel at vwfans.com
> Sent: Tuesday, December 21, 2004 8:15 PM
> Subject: Miser's monitoring method for Glow plugs
> 
> 
> I know how some read my postings with disbelief; or make me
> feel like the invisible man some times... ;o)
>  BUT here's my take on glow plug monitoring.
> Ok you want 4 LEDs on a switch blank?  Then change bus bar
> for previously discussed individual wires; but go back to a
> common point (not #4 plug) because each plug needs a wire.
>  Bare insulation near each glowplug and solder flying leads
> (these will go back to the LEDs) the other 'feed' to the
> LEDs can all come from the common junction.
>  As Hagar pointed out there will be a mVolt drop across the
> fuse and likewise across the length of glowplug supply. Dont
> use ballasted LEDs.
> Glowplug failure will extuinguish LED
> Is it +ve  to LED anode for conducting? I dunno someone else
> can explain... 8oP
> 
> Miser
> 
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--
Shawn Wright
I.T. Manager
Shawnigan Lake School