A word about the role of a battery.. it also provides electrical noise filtering in the electrical system, but in order to do that, the cabling between the battery and the system has to be low impedance and low inductance, i.e. short and good cable. On modern systems with various sensors, the sensor grounds are right at the engine metal with short connections from the engine metal to the battery. This eliminates ground loops, i.e. where ground points have different voltages compared to the battery negative. Ideally, there should be zero voltage difference between the battery negative and any other ground.
A short story... when I worked at Motorola Charging Systems, we provided systems to Volkswagen of America. and had to meet charging specs for various models. Some had batteries under the hood, some under the rear seat, and some in the back of the vehicle. The voltage regulation was slightly different due to noise present at the regulator due to cabling differences. We proposed that a standard cable setup was to be used for testing to provide consistent results.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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