1975 300D Glow plug - Mercedes-Benz Forum

 
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post #1 of 2 (permalink) Old 11-22-2008, 01:05 PM Thread Starter
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Date registered: Mar 2007
Vehicle: 1976 300D, 2002 E320 Wagon
Location: SoCal
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1975 300D Glow plug

The glow plug indicator on the dash does not light up. The battery checks out fine and the ground connection is good. All of the fuses look good and the connections on the glow plugs are tight. Is there a way to isolate a bad glow plug or do I have to remove all of them for testing?
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post #2 of 2 (permalink) Old 11-23-2008, 10:47 PM
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The glow plugs in those years are wired in series. 1 bad plug will cause the whole system to not work. You could use a volt meter and make sure the resistance between where the power goes to the first glow plug and the ground strap is low. It should not be more that a few ohms. Pull the plugs and check the resistance out individually if total resistance was high.
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