Hi Lynn, yes, the glow plugs are wired in series so if one is burnt out none will work. If I recall correctly on 384 you pushed the starter switch in to activate the glow plugs. The wire from the switch should go to the glow plug indicator on the dash then the other side of the indicator will go to #4 glow plug at rear of engine. The glow plug indicator is also in series with the glow plugs. So 12V/5 approximately 2V across each glow plug but due to wiring loss I believe about 1.6V is the reading you will see on a VOM. Some hints: Don't put 12V across a glow plug, most likely an open glow plug, a shorted glow plug will blow out all the glow plug connected before it. Measure each one with an Ohm meter including the indicator on the dash. IIRC the glow plugs should read less than 1 Ohm.
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