OK, on the confusion. I am a terrible typist and I always have to re-read and correct my postings before pressing send. I still miss some errors as you have seen. I corrected / updated that posting. Let's see if it is understandable now.

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=tree&goto=310594&rid=12#page_top

I think we are on the the same page here on the white wire at the alternator. I thought you were chasing the lead to the isolator and had it confused with the white voltage sense wire. I now see that I was mistaken.

BTW,
If I do not state something clearly, feel free to ask again. If I make a mistake like I did with the blower and horn relays earlier in this thread, please correct it. You will not hurt my feelings.

If you want to talk about this on the phone, feel free to look up my unlisted home phone number on the GMC BLACK LIST. If you get voice mail and decide to leave a message, please speak slowly and repeat any numbers twice.