ammeter

^^^ I just looked up the diagrams on mymopar for 63, 64, 65, 66. Indeed the 64 and 66 have the alt and batt wires through the standard molded bulkhead spade connections but the 63 and 65 show the heavy connections outside of the molded bulkheads. I am familiar with these as my '62 has these heavy, separate lugs also.

I can post a pix if desired. Kinda like a factory and disconnectable MAD pass-through idea. I wonder if they switched in '64, had immedate problems, went backwards for '65, and then decided they had the issue fixed by '66 and reintroduced the heavy juice through the molded bulkhead connections.