Quote:
Originally Posted by bcredliner
Since the electrical system runs off the alternator how does the battery become a filter for spikes? And if the DME/ECU and other modules protect from spikes why is it such a bad thing to run the engine with only the alternator output if necessary for a short period of time? Rather than reference most vehicles I think we need to stick to what is true of a E53.
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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.