Quote:
Originally Posted by cparke
...as the battery also functions as a capacitor to reduce the line noise that you talk about not sure why you think there would be less noise there than elsewhere in the wiring.
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There is definitely less noise across the capacitor itself because of the resistance in the long wires to the source of the spikes. The spikes become bigger and bigger, the further you are from the capacitor.
Furthermore, wherever there are sparks or inductive loops (coils, motors, alternators, loops of wiring), these all
radiate noise through the air as well. The further you are away from them, the less the noise will be. And the better the metal shielding around your equipment (in the trunk, for example), the less the noise will be too.
Quote:
Originally Posted by cparke
With the battery and sensitive electronics exposed to so much noise, really makes me wonder why they don't put a real capacitor also on the separate line to the fuses and computer modules.
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They place capacitors and filters inside each of the computer modules to prevent outside interference. In fact, every single chip inside the module needs to have its own dedicated capacitor (right on the pins of the chip) for the same reason mentioned above for the battery capacitor.