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Not misinformation. All wires have some resistance and inductance. Just because they are the same "circuit" does not mean the same location. That same common circuit could be broken down showing small resistances due to wire length (and even connections) between each part of the circuit.
Having the connections closer to the battery, and on a different connection than the starter or other high current loads will also help prevent dips in the voltage when a high current load turns on. E=I*R



The inductance or capacitance of wire in a DC circuit is nill. When you get into the Ghz, that's a different story.

I agree that being on one side of the circuit vs another can result in higher or lower voltage which is due to resistance of the wire + connections in the bulkhead.

Also when a car is running, the alternator will be the source of the current, not the battery so your reasoning is backwards.



Have you measured the voltages/currents in a car? The "noise" is well into the megahertz range. And inductance and capacitance plays a huge role in the low megahertz range.

You can bet that the battery is the source to tie to when trying to minimize noise. The battery terminals are the closest point where you will have pure DC. The alternator is a rectified AC device and it will have a ton of noise on its output.

67 Coronet 500 9.610 @ 139.20 mph
67 Coronet 500 (street car) 14.82 @ 94 mph
69 GTX (clone) - build in progress......