Ammeter on discharge

A few nights ago I was fixing my headlight switch and I had moved the fuse box out of the way. I get it fixed, I reconnect the battery to test, it works, (and here's where I do something stupid) I then proceed to push the fuse box back into place without disconnecting the battery and then pow it grounds on the dash frame and sparks fly. Every circuit in the fuse box and headlights still work. The ammeter is now all the way to the left on discharge whether the battery is connected or not. It's my understanding that if I blew the ammeter nothing else down stream would work so it's probably not that. Any idea what I could have done?

Possible fusible link.