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Old 07-12-2017, 11:45 AM   #1
atotalnincompoop
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Join Date: May 2013
Location: thunder bay
Posts: 43
First time ls/vortec swapaper, please point out the obvious for me :)

I 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 ☺
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Old 08-04-2017, 11:30 PM   #2
Korted
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Join Date: Oct 2016
Location: Seneca, KS
Posts: 10
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!
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Old 08-06-2017, 06:28 AM   #3
mongocanfly
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Join Date: May 2015
Location: alabama
Posts: 4,151
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
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