MAD ELECTRICAL?

Thanks a ton. So as I'm going through the changes I was planning I run into a goofy situation that I cant seem to comprehend. It doesn't match with any diagrams. Brown wire from alternator runs through firewall (grommet style not bulkhead) runs to ammeter then run back from ammeter through firewall (grommet) to starter solenoid. I attached a picture. Theres no fuse or fusible link between the starter solenoid and the positive running from the ammeter or even the alternator to the ammeter. I assume this is a previous owners fix and all I need to do is add a fusible link between the grommet shown and the starter solenoid? I already disconnected the ammeter gauge.