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

[Derek]

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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