Hi, that was a good picture above. I am having issues starting my '83 300d also. I checked the voltage at the locations above, and I got 0 volts with key on and off, it didn't change. What does this mean? Do I have a bad relay, or fuse, or what? I also pulled the cap off the glow plug pins and didn't have any voltage from any of them to ground,(chasis).

Am I checking voltage in correct place?

Help and Thanks,

Bob

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1983 300D Turbo, 150K