I've done all the reading, I just need a confirmation that my glow plug relay is busted given my particular situation. About a week ago, my glow plug light would barely light and never turn off when I tried to start, hard to start as well. Now, the battery is COMPLETELY dead, and this was a brand new unit week-1/2 ago. I am assuming the relay is dead and is stuck open, draining my battery. Agree/Disagree?

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1977 Mercedes 300D
1966 Volkswagen Beetle
1999 Porsche 911/C2

Probably. Check to see if you have 12 volts at the plugs all the time. You can also listen for the relay clicking on and off. If your glow plugs have been on all the time, I suppose it's also possible some may have burned out?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Without a meter testing the voltage to the glowplugs you are just guessing. Its probably a good guess, but.....

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'83 300D 198,000mi Howard
'03 Saturn Vue CVT 75,000mi(wifeys)

Change "open" to "closed" and you might have a theory. But not a real plausible one.