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Here is a pic of a bad one I tested. (This Monark Glow Plug was only in the Engine for about 1 Year; and that is in S CA Weather.)
In the drawing if the Glow Plug gets hottest in the center the closest thing to get hot is the Cylinder Head.
So the Ohm test seems to catch most of the bad Glow Plugs but is not the definitive test for Glow Plugs.
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84 300D, 82 Volvo 244Gl Diesel
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