1930 Ford with 12Si alternator

12si installed on a ford tractor


For many years the model 10SI and 12SI DELCO alternator has been a favorite for all types of cars, trucks and machinery. Heres a THREE-WIRE 12SI on a 30 Model A FORD, and it still has a Model A engine! (The old Model A generator was not strong enough to support ordinary sealed-beam headlights, the Model A had small light bulbs in a large reflector lamp assembly.) Notice that the old Model A has also been up-graded to electric radiator fans, which save horsepower when cruising (especially when revved up to 45 MPH!) Ha! (The fans are not needed at cruise speed, and it really does save horsepower not to pull a fan on the water pump.)