1985 300D will not start. Ran fine, shut off one day and would not restart.
Glow plug light comes on and goes off as normal so I assumed that system was good, so I assumed it was compression or fuel problems since those are the 3 things needed to start.
Changed fuel filters and cracked fuel line at top of injector.....getting a squirt of fuel so fuel deliver system is good.
Must be compression right?
So I do a valve adjustment and find only 3 valves that are a little tight.
Keep in mind the glow plug light comes on and goes off as it always has since day one but I pull a glow plug out anyway to check it and find no continuity from tip to tip so its bad....

What I found was every glow plug was bad with the light working perfectly.
I always assumed the relay would indicate bad glow plugs but evidently not.
Hope this helps somebody else...........

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1981 300sd
1983 300sd
1985 300d
1983 300cd
1991 350sdl