Ok, if key is in the on (glow) position... yet glow plug light only goes on for about 4 seconds (with the rest of the dash lights) and then it goes out... so I go under hood (with key still in 'on') and I go to glow plug relay. I unplug the smaller of the two plugs and I hear the relay click -- when I plug it back in I hear it click again.

What does this mean (if anything)? Is my relay still good? Just bad glow plugs?

Thanks GD