Honestly, I've searched and this seems like it has got to be one of the easy ones but....

With no warning of any issues developing, I got in this morning, did the pre-glow, turned the key and...nothing. I wiggled the shifter to no avail. I tried to jump it and got nothing. This evening, I put it on the charger for several hours and got the same result. With the key turned to the far right (not engaging starter), if I cycle the shift lever I will get a click and the glow light will go on and off (NSS ok?) Glow plugs are getting warm.

Any ideas?

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1979 300D 275K