I am replacing the male end of the plug. Does it matter which post red and black are on i.e. does it have to be the same on the male and female plug as long as ground and neutral are correct? thanks-
You could select the best by placing a large load on each (one at a time) and measuring voltage drop. I use a 1500 watt heater, with a polarity checker, and a kill-a-watt meter.
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