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art-if i saw the upper trace-main pump-and not read the rest, i would've said-needs a main pump. funny the mis-wired feed pump did this. but, the main pump was pulling against a pulling feed pump, so the strain would show up. would like to see the main pump trace after the re-repair.
why the resistor for the amp draw test? because of the scope? looks digital. i've just used a dvom and an inductive pickup for the draw test. i've only scoped a couple of pumps. noisy, with a changing draw and no cavitation made me look at the trace.
looks like you nailed it. good job, chuck.
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