1981 300d 123 130 - Mercedes-Benz Forum

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post #1 of 2 (permalink) Old 03-14-2005, 04:21 AM Thread Starter
BenzWorld Junior Member
Date registered: Mar 2005
Vehicle: 1981 300D
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1981 300d 123 130

the fuse element inside my pre-glow timer relay is blowm. my "repair manual" states to test the glow plugs w/ohm meter set on 200 range. diconnect glow plug harness connecter at relay & go from ground to each numbered terminal in turn. any infinite reading on meter indicates a defective plug or it's correponding wiring. all 5 of my plugs are showing infinite readings. could they all be bad just like that? is there another way to check them. thanks for the help.[B)]

1981 300D
1964 international harvester C1200
1984 chevy cavalier
5 kids/2dogs
benmaples is offline  
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post #2 of 2 (permalink) Old 03-14-2005, 05:44 AM
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Date registered: Jan 2004
Vehicle: 1959 220S cabriolet, 1983 240D original owner, 1999 E300 turbo diesel, 1988 560SL, 2003 SLK320
Location: Ocean Isle Beach, NC
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RE: 1981 300d 123 130

If the car started before, then some of the glow plugs ought to be good. A good plug tests 0.6 ohms. One lead on the ohm mmeter goes to ground. The other you stick in the harness end connector for each glow plug. I guess you could buy one new glow plug and replace the easiest one and make sure you are doing the test right.

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