Henry's 70 Dart Swinger

I've had the dubious honor of almost cooking my wiring harness from that exact same thing you pictured above...do yourself a favor, bypass your ammeter, repair any burned wires with the correct gage stuff, clean and lube all accessible terminals with wire brushes and dielectric grease, and install a heavier gage charge wire from the alternator directly to the starter relay. You'll still have full battery power available to the inside, but that wire you pictured will only flow the power you required--not the full charge amount coming from the alternator.