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for some reason in my mind i was thinking the aux washer pump and not the aux coolant pump .
i would perform a resistance check of the harness. from the wire in the ihka harness to the signal wire from the connector to the pump. should be less than 1.0 ohm or very near. Anything more could indicate a problem with corrosion or internal break of the wires (think only one strand carrying current) which would really drop the voltage a whole lot.
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2003 4.6, esotril blue, over 215,000KM. Every previous owner failed to keep up the vehicle maintenance. Restoration project.
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