Check out:
https://www.fordbarn.com/forum/showt...ight=accessory
There are some posts in there by Y-Blockhead showing a fuse panel install that is unique and exceptionally cheap. He also mentions installing circuit breakers on his starter motor and at the alternator. If you contact him, he will send a well-done schematic of his layout that addresses your issue. His electrical system is 12V but all the 12V components (circuit breakers) work exactly the same for 6V, which is what I also have. I just completed installation of this same setup, which works very well including the 12V version of the circuit breaker.