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This diagram shows the simple wiring diagram for negative ground delco si series alternators the ignition switch is most commonly powered from the starter battery stud but source may vary depending on application with key on power is then transferred through the no charge indicator light to the 1 spade on the alternator regulator connection. 10si alternator wiring the 10si has three terminals including those with a 1 wire regulator the large batt terminal which gets connected to your battery positive or terminal post if your vehicle is so equipped and a dual terminal connector repair pig tails for this connector available at any autoparts store. 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 youll find on the generation of gm cars most often used in demolition derbies. 10si alternator operating principles a typical 10si series wiring diagram is illustrated in figure 3 the basic operating principles are explained as follows the no 2 terminal is connected to the battery and the base emitter of transistors tr4 and tr1 is connected to the battery through resistor r5 thus turning these transistors on. The alternator turns on the voltage regulator when the engine starts turning the alternator two wire alternator most standard and all self exciting regulator alternators will work using the two wire setup two wire means that you use the main battery wire to the back of the alternator and also ignition wire to the 1 terminal to activate the