I'll second this. If the plug is bad, the meter will peg out and not drop.
Luther
Fmiser wrote:
ernest breakfield wrote:
what's the best way to check to verify exactly
what the problem is? is there perhaps a handy diagnostic
write-up somewhere online someone can recommend and point me
to?
My favorite way to test them is with an old-fashioned automotive
ammeter. (Note - this method is for the "new" parallel pencil plugs) The
ones that display -30,0,+30. I put 12AWG wire leads on it.
To use it, I pop the top off of the glow relay and unplug the connector
for the glow plugs. There is a contact for each glow plug in this
connector, so I clip on meter lead to the fused side of the big,
screw-in fuse and then touch each contact, one at a time. The socket
has pin numbers molded into it, and these numbers correspond to the
cylinder number.
This method tests the wire _and_ the plug. When cold, a good plug draws
about 20A (Well, on my meter it point to the mark for 20 amps. I have
not calibrated or tested the accuracy of that meter...) It will drop
back to about 15A after 8-10 seconds.
My favorite way to test glow plugs is with an old dashboard
ammeter wired to a length of 12 AWG cable.
-- Philip
--
Luther KB5QHU Alma, Ark
'87 300SDL (281,xxx mi)
'85 Ford F250 6.9 diesel (x59,xxx mi) BioBeast
'82 300CD (183 kmi)
'82 300D (74 kmi) getting donor engine-sold
'85 300D (280,176) parts car sans engine "The Accordion"
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