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Where do the wires for the internal reg connect to? They are usually just plugged into that 6 pin plug (only 3 of wires are needed).I would leave the external reg mounted there if you plan on doing any touring.Often find an internal reg alternator in the wreckers but regs are nearly always missing.It is easy to switch between internal and external reg alternators if original bits are still in place.
You should not need to loop any wires in that plug if internal reg alternator is wired correctly, Looping those terminals bypasses your warning lights and you may find you are over charging the battery as well.