Shut off while driving without warning?

While driving the car suddenly shut off. No loss of power (alternator is fine), no bog down (wasn't engine failure or fuel issue). Just complete instant shut down. When I tried turning the key, had full electric, but no starter engagement. No sound, clicks grinding. So just to trouble shoot I was going to pull the starter just to eliminate the possibility. Upon removing the main fuse box, I noticed two bare wires from underneath the box. I found the were both connected to the 100a main fuse block. I assume these are the issue, but I cannot figure out how to reconnect the two black wires and one white wire to the block, also do I need to run a fusible link to replace these two? If so, where do they run to?