Quote:
Originally Posted by upallnight
I said that the car ran off both the battery and alternator not one or the other. As more electrical load is placed on the system, the regulator compares the voltage that the battery is putting out along with the voltage the alternator is putting out. It adjust the alternator voltage so the battery is always being charged.
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I understand the alternator regulator adjusts the output to keep the battery changed and provide for electrical systems draw. That seems contrary to the battery is only used to start the engine and supply current to those things that the circuit is completed when the key is turned on. And, that once the engine starts the alternator is the source of current for all electrical systems.