No power at key

Have you checked your starter?Maybe have someone give it a whack while your holding the key in the on position?If this is your problem,replace with a mini-starter from 90ish Dakota.Much better than the big one.JMO.
If your starter does not have those big screws around the starter motor frame you DO NOT want to hit it with a hammer . Ever! You can damage it. In the old days we can do that. Not now. Not with newer, and smaller starters. You can crack the motor frame, and damage your armature, commutator, and field coils which can be mounted on the starter housing which you do NOT want to ever hit with a hammer if there are no big head philip screws in it.