86 Cherokee Laredo

I HAVE AN 86 CHEROKEE LAREDO 2.8L V6 THAT NO LONGER RUNS, NO DASH OR INTERRIOR LIGHTS, NO ELECTRICAL OR ANYTHING WORKS. I CHECKED ALL THE FUSES THEY ARE OK,I REPLACED THE BATTERY AND STILL NOTHING, I EVEN TRIED JUMPING THE STARTER WITH A PUSH BUTTON SWITCH. THE ENGINE WOULD START TO CRANK BUT NOT TURN OVER. ANY SUGGESTIONS, MAYBE THE NSS OR ANYTHING ELSE TO CHECK, I HATE TO LEAVE IT SITTING IN THE DRIVEWAY OVER THE PAST FEW YEARS I HAVE REPLACED A GOOD AMOUNT OF PARTS ON IT.