Glow Plugs out on my '82 300SD, suddenly. Checked the 80 amp strip fuse in the glow plug relay and it's fine. All glow plugs the same resistance with the 5 wire plug disconnected. Power is good to the relay on the large wire and good on the smaller connector from the ignition. I opened up the relay and it looks fine, nothing burned and the points were clean.
Does this sound like the relay itself is bad? Is there any way to check this?
Thanks,
Wayne