I have a 1986 Nissan/dat truck that won't turn over any suggestions

first off if disconnect clutch switch you must splice the 2 wires together on the jack you pulled,,thats ok that way it just cranks without depressing the clutch,,beyond that a thiner wire runs from the ingnition switch to the starter solonoid, usally on top the starter,temporaly take a hot wire from bat.plus+ to solinoid and touch terminal,make your in neturial or the truck jumps forward,it should crank if not starter or solnoid or ground needs cleaned

the floormat has been removed from the action of the clutch. You already noted this. Check your battery to make sure both terminals have no corrosion and the black wire goes to the block and to the engine. then we'll talk~

the battery is most likely corroded and needs to be hosed off and wirebrushed. get the ground wire and and other side terminal what goes to the frame and block. Establish good electrical connections. very necessary.

Thanks everyone it ended up being the ignition was locked... Now I have another question.... Anyone know why it won't idle???? I can get it to start but it dies afterwards... Any suggestions?

um....the ignition relay? https://www.google.com/#q=1986+Nissan+ignition+relay&tbm=shop