My car has stopped starting and I'm pretty sure its the glow plugs. This time though the light on the instrument cluster doesn't come on at all when I have the key in the charging position. Does this indicate a possible relay problem? I haven't had time to do anyhting other than try to start the car so I haven't checked fuses or anything. Also I heard when changing the glow plugs its good to try and start the engine when u have them out to get some carbon out of there. I haven't done this before but watched someone do em a little while ago and it didn't look too complex. I'm going to keep the lines on but I figure i'll be ok if i can mannage working inside the door panels. Anything I should look for thanks. I've done a search on the topic

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W126 1983 300SD 286,000 miles and ticking
Baby blue exterior Grey MB tex
Recent work:
Replaced air cleaner mounting brackets and heat shields
Replaced alternator, fan and power steering belts
Replaced positive battery terminal
Replaced negative battery terminal and cord
New Duralast Battery

My car needs work.