Hemi Alternator Wiring

thedartsport said
Hey all, trying to figure out what I’m doing wrong with my alternator on my Hemi swapped Challenger. I used the old style external regulator and wired my exciter to it and one of the two wires coming from the plug on the alternator. 12 volts when the key is on. Then I wired the output to the battery, but it will not charge while running. Is there something about the new alternators I’m missing? I have a good ground at the regulator. I used the diagram attached in the pictures. Thanks!

This thread is a bit old, but I thought it was worth adding some help for anyone else that comes across it. I am working on my 2nd hemi swap with a 2010 6.1 from a challenger into a sweptline. I am using a Holley Terminator X and tried connecting a standard voltage regulator as in the diagrams, but it did not work and made the alternator overcharge when connected.

I did some research and found that the newer alternators are controlled by a PWM+ signal from the factory computer.
I found an easy solution to allow using an external regulator is to replace the driver in the alternator. Very simple replacement using this part: 4682207MOD - Modified Driver, ECU interface for Denso Alts on 07 & up Dodge, Chrysler, Jeep. Needed for Regulator kits ERCKFRM, ERCK and ERCKE they also have a video explaining the install.

As I have researched this more another possibility may be to use the Terminator X and a solid state relay to convert a PWM- signal from the Terminator X to PWM+.
Holley makes a harness and has instructions to control Ford and GM alternators that use the PWM- signal, https://documents.holley.com/199r12368.pdf but the terminator will not output a PWM+ signal so I am not sure if using a relay to convert the signal would actually work so for my purposes I went with replacing the driver in the alternator which is much cheaper than buying a replacement like this ALTERNATOR ONE WIRE 5.7 L/6.1 L 180 AMP - Bouchillon Performance Engineering

Hope this helps others get their alternator charging when not using the factory computer.