AC power stops at fuse box

Hello All,

My home was built in 1989. I am sure the air conditioner is original to it. This summer the outside unit (fan not spinning) stop working. I tested the wiring inside the house and got a positive read. I tested the wire outside and the portion that leads from the inside of the house has a reading for electrical current, but past the fuse box that portion is not receiving power. I tried replacing the fuse since that seems to be the problem, but that did not help. Any other suggestions I can try?