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Bench and insitu tests already done on the current Pump as noted above.
Problem may be too high current draw or some other obscure problem. Hence the simple substitution plan.I agree ,not logical but no harm trying.
The Power Probe Continuity test with a transmitter/receiver is next. Prime suspect is the huge fat harness & specifically the conductor between the back of the alternator and the rear relay tray+40A fuse holder. Don't want to unbundle that harness needlessly ! May be multiple issues.For example - until I get power to the relay tray , I can't test the rest of the circuit.Lots of poking and probing to do.
Thanks for your positive thoughts.
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