I plan to install the lighter weight Denso ~60 amp alternator into my 72 Challenger (actually, a 70 T/A clone done many years ago).. car used extensively for AX, HSAX and HPDE lapping events (plus local cruises... summer only).

Is there a pre-made complete wiring harness available to replace the original factory harness? Car has factory electronic ignition (I've relocated the ECM -- chrome box -- under the dash by extending the wires).

Although I've recently purchased a new factory harness (not yet installed), I wonder about the Voltage Regulator... will that no longer be used (in other words... it can be removed since the Denso alternator has an "internal" voltage regulator? If that's the case then the wiring on the new harness is no longer needed for the Voltage Regulator.

Any advice very much appreciated, as well as other wiring harness revisions that would be needed to make the DENSO swap.

My new SB engine will be going into the engine bay soon (maybe end of October)... would like to get the new harness installed before hand, if possible.

There should be a dark blue wire that is switched 12 volts connected to the factory voltage regulator. You can take that wire and run it to the Denso as the switched 12 volts. The other wire on the Denso is the sense wire. It needs to go to a 12 volt reference point. Perhaps the starter solenoid or some other place where you can access 12 volts.

It depends on the alternator you are going to use. I always use the factory dodge truck denso or police/ diplomat. They require an external regulator. The O E regulator works fine with them, but I like using user adjustable regulators.

Of course there is the 1 wire 60 amp Denso that eliminates the wiring issue.

Whatever you do, bypass the factory ammeter and run the charge wire directly to the battery with a fusible link.

i'm not a fan of the one wire alternator, as i have found out there are potential problems of low output at idle. especially with using GM style one wire units.
i prefer the three wire versions that use an external regulator.
just my opinion. your mileage may vary.