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If it starts by jumping then probably the NSS if it starts while moving the shifter probably linkage adjustment. If neither works then jump the starter terminals. If that doesn't work then it's starter. Have you had the battery checked and charged? With the headlights on does trying to start the truck kill them? Another way to check the NSS is to ground the starter relay terminal that the NSS wire plugs onto. If the truck starts then that points to the NSS or linkage adjustment.

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Thanks Will let you know what I find.