[John Rogers]

You might want to try by-passing the key and all it's wires by hooking up a remote starter switch such as those used to jog the engine over for adjusting valves, etc. It is hooked from the batt to the spade lug on the starter and should crank easily. If it still doesn't spin, it may be the big cable from the batt to the bolted lug on the starter, especially if it is more than s few years old. My daughter's car had the original batt to starter cable which was as hard as solid steel and had huge amounts of resistance! I used a 2ga length of welding cable and put on my own ends and it sure spun better! Good luck.