I agree with you on the pump resistance not being far enough out to cause an issue. Measuring resistance on any motor circuit is misleading and should not be relied on, the position of the brushes to the commutator will create diff readings, next time you take a fuel pump out of its box, measure its resistance , then measure again after it has run a couple of minutes, you will see what I mean.
What Mark is alluding? to, is that the effect of circuit resistance will vary depending on the load, thats why I gave the starter example. You can have high values of resistance in a sensor circuit with out much of a problem (little current flow), yet the same amount of resistance in a motor circuit can cause all sorts of issues.
It is more or less only useful for determining if you have an open circuit and little else.
Volt Drop circuits under load conditions will give you the full picture.
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