Is it Glowplugs? Relay? Starter?

[mnvwman]

Here is the problem I am having:

I have a 1985 300D.......My glowplug light does not come on at all! If I do turn the key to the glowplug position, I will get a loud buzzing noise out of the relay that will last last for 5 seconds or so then go off. I wait for another 10 seconds or so and turn the key to start....and I get nothing, no really even a sound from the starter.
My battery is fully charged and the 80 amp fuse on the relay is good, I checked that. What would cause it not even to turn over? Would bad glow plugs or relay cause this? I also wanted to add that it has been between 0 and 20F for the past week. The last time I was able to start it was a week ago. It did start that time, but no glowplug light either then....

Thank you so much,


Guy in MN