When you say "won't turn", I assume you mean no response at all from the starter, meaning no click or anything.
After the NSS, I would start with the electrical connections running to the starter and the battery cables/battery ground. The starter draws more current than the accessories, and a marginal connection may only be evident under load.
Could also be the ignition switch.
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1986 300E 5-Speed 240k mi.
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