If anyone has access to their Monte, I would be curious to hear what voltage you are getting at the exciter wire with the harness unplugged and the key in the on position. Numbers from SI (original) alternators will also help as I can compare with the voltage before my adapter harness.
Stock SI harness: From brown wire (pin 1) to ground
CS harness: from brown wire (pin L) to ground
Just got out to my car. I had to uncover the garage door from under all this white stuff!
Anyway, Exiter wire voltage with harness unplugged from the alt. is right at 12v.
Brown wire is at 12.5v on the si side, & after the adapter it's at about 11.8v
Anything else you need to know? I've finished my swap & all is working fine.