Not to argue but if the test light lights that seems to me to say that the
glow plug is good due to the fact that the heat is created due to pwer being
applied to the plug and then shorted to ground. If the light did not light
that would indicate a broken circuit and therefore a bad plug. Just another
way to measure continuity is all it is. Does continuity indicate a good MBZ
glowplug? WOrks for Ford(Navistar) pencil type plugs.
Mike(Who is waiting to be corrected by Herr Doktor....)
Mike
----- Original Message -----
From: "Marshall Booth" <[EMAIL PROTECTED]>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Wednesday, November 22, 2006 10:11 PM
Subject: Re: [MBZ] Glow Plug Testing
LarryT wrote:
Howdy All,
I went to Sears, Radio Shack, Home Depot and Lowes looking for a
multimeter
that will test DC current to at least 30A.
No luck - Sears was sold out and the rest don't carry them. So, I'll
order
a tester and will be able to test the GP's as Jim C. described. When I
got
home I did a Google for GP Testing - and got this:
"Testing glow plugs is easy and can be done with them still installed in
the
engine. Just disconnect the wire going to each glow plug. Connect a test
light to the POSITIVE (+) battery terminal and touch the point of the
test
light to each glow plug terminal. If the light lights, it's good. If it
doesn't, it's bad and needs to be replaced. Do you replace just the bad
one
or all of them? My opinion is that if one went bad, then the rest are not
too far behind. So I recommend replacing all of them at the same time. I
would replace, at the very least, all of the glow plugs on the same
side."
It came from
http://autorepair.about.com/od/enginerelateddiyjobs/l/aa081404c.htm
which
some may find interesting.
So, my question for jim, etc is will this work as well as they say? It
looks more like they're testing the engine for a good ground thru the GPs
but perhaps it tells if the GPs are good also??
What's the concensus? Is this test as good as testing the DC current?
NOT even close!
Marshall
--
Marshall Booth Ph.D.
Ass't Prof. (ret.)
Univ of Pittsburgh School of Medicine
[EMAIL PROTECTED]
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