Wiring Diagram For Internally Regulated Alternator

Decotron 10 si internally regulated alternator series. This diagram shows how to wire a delco gm internally regulated 3 wire alternator.

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Wiring diagram for internally regulated alternator. This is the second conversion im detailing and it is for those who have a generator now and want to take their charging system two steps forward in life. This page attempts to document some of the common details and facts you need to know about when converting the existing charging system on your older gm vehicle to something newer and hopefully better. The diagram above is how i converted my 71 rs over to internal voltage regulatorworks like a charm and very simple to do. Through this hole you can see a metal tab. This particular model 10si used in the 1970s and early 80s is the one youll find on the generation of gm cars most often used in demolition derbies. I am sorting out the wiring and my subaru alternator has the large white wire that goes on the alternator post plus the round connector that also has a large round wire plus three smaller colored wires green w black stripe black with white stripe and solid yellow. There is a semi circular hole in the back of the gm. Most people will just swap out the generator for a typical 12 volt ac delco 10 si alternator. So you have an old car that has a 6 volt electrical system and you want more electrical power. Converting a generator to an internally regulated alternator. The 12si is funtionally the same but does not have the ribs on the case that the 10si does and looks a little more stock. The aftermarket chrome one probably has an internal regulator and thus doesnt need the redbluewhite for the 1 and 2 connections to the alternator. A few years ago we took a car totally apart and learned a lot about wiring in the process. Ive got an ej20 in my vw bug. Wiring an alternator.

The most common method when converting an early model and the one outlined here is to use the internally regulated 10si or 12si. Okay that first one appears to have been for the stock alternator with an external regulator.