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Since you have 5 good glow plugs and a new relay, I agree that it could be a wiring problem or an ignition switch problem. As I am on the road and away from my library, I can't advise you as the the wiring of the small 5-pin plug. The fifth wire might be for afterglow (engine temp sensor input?) but that's just a guess.
Once you figure out the wiring, you can try connecting the relay to 12 volts directly (not going through the ignition switch). The ignition switch is not terribly expensive.
Jeremy
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"Buster" in the '95
Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970
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