[Vwdiesel] More glow plug testing Q's ...

[Derek]

Forgot to mention that the really bit 50A ATO ( I know its not but ... )
checked out OK.  Its located under the dash, above the relays.

Derek, 1995 Jetta 1.9TD


----- Original Message -----
From: "Derek" <weasel1 at sympatico.ca>
To: <vwdiesel at vwfans.com>
Sent: Wednesday, December 29, 2004 1:10 AM
Subject: Re: [Vwdiesel] More glow plug testing Q's ...


> Allright I am totally confused.  There is a flat strip type fuse near the
> overflow bottle.  Its rated @ 50A.  That's my glow plug fuse ?  I also
> appear to have another one under the dash.  Its like a really big ATO fuse
> sort of a reddish colour and its also 50A.  I was told by my mech a long
> time ago that that one was the glow plug fuse.  Anyway, the flat one by
the
> overflow bottle had a crack in it and is now in two pieces.  I'll be
getting
> a new one either way.  I tried the snow test and finger touch test to the
> GP's.  No heat.  The part of this that really baffles me, I have had a
test
> light hooked to the bussbar for some years now ( so that I can monitor the
> afterglow cycle ).  With that flat fuse removed, it still shows power !
>
>
> ----- Original Message -----
> From: "James Hansen" <jhsg at sasktel.net>
> To: <vwdiesel at vwfans.com>
> Sent: Wednesday, December 29, 2004 12:24 AM
> Subject: RE: [Vwdiesel] More glow pulg testing Q's ...
>
>
> > Yes.  With a infrared thermometer- the point and shoot kind.
> > With a cold engine, cycle the plugs a few times.  Shoot them with the
> > infrared thermometer. The warmer ones are working.
> > That's the only SURE way I know that doesn't involve clamp on current
> > meters.  If you had a small enough probe on a clamp on current meter,
> > measure between each plug with the plugs lit.  The one that has no
change
> > across a plug would be the dead one.
> > Other than that, measure voltage drop across each plug.  Need a fairly
> good
> > volt meter to do that, and a clean busbar to get perfect contact for the
> > probes.
> >
> > That said... why?
> > If there's a plug shot, you know it for sure when you start it.  You
have
> to
> > remove the busbar to get one plug out anyway... well not really but it's
> > very very much easier in a relative sort of way, the bar doesn't bend
out
> of
> > the way very well at all to let the plug past.
> > Pull the busbar, use a testlight, clamp to + terminal of the battery,
> touch
> > probe to ends of the plug to test.  If it lights, it's a good plug.  If
> not,
> > it's shot.
> > If you replace one, the rest aren't too far behind.
> > Use antiseize.
> >
> > -James
> >
> > -----Original Message-----
> > From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
> > Behalf Of Derek
> > Sent: Tuesday, December 28, 2004 5:03 PM
> > To: vwdiesel at vwfans.com
> > Subject: [Vwdiesel] More glow pulg testing Q's ...
> >
> >
> > Is there any way to identify a dead plug without removing the bussbar ?
I
> > suspect I have a dead plug ( at least one, it does fire, but only after
> > about 20 seconds on the starter .. )  I think I have an ammeter from a
> gauge
> > cluster.  I was thinking of removing the fuse near the overflow ( the
flat
> > one ) and hooking up the meter there.  With that, I'd know how many, but
> not
> > which one(s) are dead.  Maybe its time for individual wires to each GP.
> > Sure would make testing easier ....
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