can I attach a extra 10 gauge wire with a 12 gauge Fusible link to the alternator and run it to the positive starter motor bolt. I figures this will take most the electrical load off the bulkhead wire going to the amp gauge. Will this work?
Yes you can if you mean the starter relay stud. It will do exactly that. Your ammeter will still work this way buy will be less sensitive due to less current. Your alternator only puts out what's needed anyway.