I think you are they should be color coded and match up directly .....however if you changed the wires completely they i would suggest find another 2003 Impala and either photograph it or write the sequence down a dealership will allow you to look at the motor even if you have to pretend you want to test drive it or just look it over
If I understand this correctly, your replacing male plug end for block heater. What color wires do you have, black,white & green?
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which wires go to plug connections (2 black one green)
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