First time ls/vortec swapaper, please point out the obvious for me :)
 

http://i65.tinypic.com/30m5y53.jpgI have a mickey mouse standalone harness that I had made by some dude on ebay out of my stock 99 gmc harness that I harvested my 4.8 out of.
The guy offers ZERO tech support and no instructions so I have a few questions, I'll post them one at a time and address each issue and resolve it before tackling the next.
I have an aftermarket 21 circuit wiring harness in my 55 gmc. This harness has an alternator exciter wire and an alternator power wire. The standalone harness has a single wire that plugs into the alt. Is that the exciter wire? Do I need the exciter wire from the 21 circuit harness or do the pcm control that.
The alternator is the stock unit from the 4.8 truck engine.
Thnx ☺

Re: First time ls/vortec swapaper, please point out the obvious for me :)
 

You do not need excitation wire for newer alternators. Yours should be internally regulated. Review the information at
http://lt1swap.com/underhoodfuseblock.htm

There is a lot of detailed information here. If you're still unsure, ask away!

Re: First time ls/vortec swapaper, please point out the obvious for me :)
 

also posting your ls questions in the ls forum may get you more reponces...but I agree..no exciter wire needed