I have a 1988 Lincoln Continental starts... then dosent start

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started this morning ..went to wrk ... turned it off would not start back up ... after wrk wouldnt start ..then it started .. got hm .. now it wont start... tried wiggling the batt wires .. looked for loose wirer... tapped on the starter... played with the gears, from park to nutural and back and in between nothing will not start????? could You please give me some Idea whats going on so that I can fix it Please...