Discussion
Which effect does a poor earth between engine and body have on charging?
Answer: A
Resistance in the return path appears as a voltage the regulator does not see, so the battery receives less than it should. Whether it under or overcharges depends on where the regulator senses, which is why sensing arrangements matter. The shared behaviour explains why these belong together and the differences explain why both exist. Tracing the requirement back to the physical constraint that produces it makes the answer follow. Working one numerical case through both cases side by side fixes the distinction better than any rule of thumb.
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