Herme,

There is a great picture of a SI alternator in the link 54TOW posted (thanks). Sometimes it's difficult to differentiate between 'plug on the back' and 'plug around the circumference'. The picture of the SI alternator explains it all.

If you don't have the SI Delco alternator, and you do have the old 10DN with the plug on the back, my only advice would be to trade it in for a SI unit...you don't want to go through a bunch of work and end up with a external voltage regulator.

Take a look at the picture in the link and see if it's what you have.

I have enclosed another link showing the different positioning of the DA terminals, which is the dead nuts method of ID'ing them.

http://www.rowand.net/Shop/Tech/GmAlternatorIdentification.htm

Stuart

Last edited by atomarc; 09/11/2008 5:32 AM.