Discussion
Which measurement reveals a poor battery connection?
Answer: D
Measuring between the post and the clamp while cranking should show only a few millivolts. An ohmmeter cannot resolve the milliohms involved, which is why volt drop under load is the correct technique. It applies to every high current connection. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.
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