1982 Silver Spur dash lights up won't crank

First thing I would check is starter solenoid to see if it's getting power from key switch signal. If it is then starter may not be getting juice from battery or ground or it's failing.

Also will your car start if you put ignition key in run postion and then put remote power to the starter to crank engine? If it will you probably have an issue with the electrical portion of your ignition switch. Check to see if you have power to the high voltage side of your starter relays. If not check for a bad fuse. If so check to see if low side powers up when key is turned. If so it means you are gettintg current from the switch. So keep checking for power all the way to the starter. If not check and replace the ignition switch.