I'll second the 30-0-30 ammeter. If the current use doesn't drop to around 10-15 after a few seconds, it's a bad plug. That's all I use.
Luther On Thu, 29 Nov 2007 09:28:46 -0600, Jim Cathey <[EMAIL PROTECTED]> wrote: >> Could you please elaborate on the resistance comment for testing glow >> plugs? >> is there a ohm reading that states the glow plug is acceptable and >> anything >> above/below that reading is a call to replace that glow plug? > > Parallel plugs measure about 0.6 ohms cold. And your meter has > to be good enough to resolve down this low, not all are. Series > plugs are almost immeasurably small with any common ohmmeter, > around 0.02 ohms hot, measuring the voltage drop in operation > is much more reliable, and infinitely easier. > > The best parallel test is a current meter, but ones that will > measure up to about 30A (peak) aren't cheap. Old panel-mount > automotive ammeters work well for that. I have one parallel > plug that measures pretty good on the Fluke ohmmeter (not > sucky), yet it draws about 2x the proper amount of current. > Most failures are more obvious, and measure as a notably > higher cold resistance. > > -- Jim > > -- Luther KB5QHU Alma, Ark '87 300SDL (272,xxx mi) head case '85 Ford F250 6.9 diesel (x58,xxx mi) '82 300CD (166 kmi) '82 300D (74 kmi) getting donor engine-sold '85 300D (280,176) parts car sans engine _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
