not turnning over could be a few things, neutral safety switch could need cleaning, ignition switch crapping or a bad power/ground connection between engine and battery. neutral switch can usually be checked by holding the key in the start position while racking the shifter back and forth with a foot on the brake incase it starts, ignition switch (or neutral switch) by crossing the starter contacts, jump the main lug on starter to the small blade (green/red wire i think) and the starter should engauge
all america wants is cold beer warm cat and a place to take a poop with a door on it