[Blas]

Does your setup look like the photo posted below? Or if I understood you, you have 6 wires on the left and one on the right side of the fuse? Is the one wire on the right coming from the AMP meter or the charging system? All they factory looking end connectors on the wiring? Photo of fuse panel and starter solenoid on FW would helpful? Perhaps find where your charging wire from the alternator/voltage regulator is connected? Could be on starter solenoid on firewall, or if that was removed, on the starter itself. It should not be connected to the left post of the fuse, bypassing the fuse.

In short: the charging wire could be connected before or after the AMP meter, which allows for the single wire on the right side of your fuse, (you'll need to chase it) But it should NOT be connected on the left side of the fuse. If it is, the amp meter would see no current draw; The cars electrical system would be unfused;