No Crank, No Lights, No Click, Battery Not Dead?

If you did not have power "to" the ammeter that is on the red wire, the problem HAS to be right in the bulkhead connector. Again, follow the "path" outlined in the simplified diagram. Putting a load on the system and "wiggling" stuff usually points up troubles like this.

It surely must be right there in the area of the fuse link.....bulkhead connector....and ammeter

DON'T NEGLECT the ammeter wire ring terminals (Or any other terminal!!) The connection can fail INSIDE the molded on connector