How to Wire an AC Delco 3 Wire Alternator | It Still Runs The AC Delco 3 wire alternator was used in most General Motors products, and many types of heavy equipment, for a long time, which makes it readily available. This alternator has the advantages of high output, compact design and ease of use. With the proper Wiring a Delco (GM) Alternator Wiring an alternator . This diagram shows how to wire a Delco (GM) internally regulated 3-wire alternator. This particular model (10SI, used in the 1970s and early 80s) is the one you'll find on the generation of GM cars most often used in demolition derbies. 3 Wire Gm Alternator Wiring - Wiring Forums Trying to find information about 3 Wire Gm Alternator Wiring? you are right here. You might be a service technician who intends to look for recommendations or solve existing problems. Or you are a student, or maybe even you that just want to know about 3 Wire Gm Alternator Wiring How to Install a 1-Wire GM Alternator | It Still Runs Installing a one-wire GM alternator makes the process of adding an alternator to a vehicle originally equipped with a generator very simple. One-wire alternators are also used by people in the performance car field to help make the car lighter as there are fewer wires to add weight to the vehicle.