My 77 has the upgraded pencil glow plug and original relay. Recently the glow plug light wouldn't come on unless the starter is engaged. The relay isn't providing juice to the plugs when the key is in "glow" position but if you take the relay out then the car won't start. Any ideas on what is going on here? Also can't hear the relay trying to click in glowing position and I have tried unhooking the temp sensor so the relay would think it is very cold out, no dice.

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1977 300D Lost coolant while someone else was driving
1983 300D Can't run without oil
1985 300SD (gone but not forgotten)
1990 300TE 4matic Sold
1991 Yamaha Venture
1975 Kawsaki 250 triple
1974 Honda 200CL
1951 8N Ford
2008 Wildfire 650C