thats bc ur alt to battery wire is melted...that creates a big voltage drop...increase ur big 3 to 1/0 and have funeven with the new alt it still draining the electric system
I'm currently running 2 gauge welding wire from my work, strongly suggested by EA, to run to the 200 amp alt, and no melted wires as of yet. But yes, 4 gauge is a little too little.I think 200 amps is a little much for 4 ga. Bump it up to 1/0.