67Dart273 PM'ed me about this thread as he recalled mine linked below. The dual diodes allow your dash ammeter to still work at lower currents, but shunts progressively more current straight to the battery at higher outputs. The ammeter is intended to read all current flow in and out of the battery, except for underhood loads (starter, horn) or special cabin loads like convertible motor or spotlight.
Modernized Engine Wiring | For A Bodies Only Mopar Forum
1963 and 1965 have the dedicated buss-bars which 67Dart273 shows. 1965 is better since it has more terminals. In 1964, they moved the large IGN and BAT wires to regular 57 terminals, which might have caused melting issues (familiar?), so apparently walked that back in 1965. In 1966, they moved the wiper motor into the engine bay, so added a 3rd terminal row and put IGN and BAT back to spade terminals, I recall bigger ones but not big enough (hence these hacks). I changed my 1964 Valiant to a 1965 bulkhead from a Fury. I had to cut the square opening ~1/8" taller to fit.
