My 54 3100 has been converted to 12V and has a one wire ALT. I want to add some protection to the circuit at the BAT terminal on the ALT. A friend gave me about 5" of fusiable link wire which looks to be 10 gauge (I have 10 gauge wire in this circuit). The fusible link wire seems to expire within weeks or months of use (no smoke, but no longer allows current to reach the BAT terminal on the ALT. What might I use to protect this circuit, as by the nature of a one wire ALT, it is HOT all the time. The ALT is rated at 63 amps.

Please help.