Besides the obvious (bad starter), does anyone have any idea what would make the ignition just go CLICK, from time to time? It seems like it does this more often after i've driven it for 10mi or so, go in a store, come out then when I try to start it it goes CLICK. On another car this would happen when the tranny electric plug wiggled loose, but this doesn't seem to be the prob here.

Any thoughts?

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1983 300SD 296K+
1984 300SD parts car