Voltage regulator problem with 1968 Dart

Brand new alternator, dual field converted to single with one terminal grounded.
Brand new Voltage Regulator
6ga continous wire running from the alternator to the trunk
Here's the problem.

The car does not want to charge I installed a new Alternator and Voltage Regulator
when you turn the key to Accessory position, the voltage regulator gets fried and smoke comes out.
I checked the voltage at the blue wire coming into the voltage regulator, 12.4 volts

Something is wrong in the regulator circuit. Does the new M&H harness match the original harness removed?