How to test for reversed polarity, to test for reversed polarity you need to use tools to check if positive and negative or hot and neutral are swapped, with methods depending on AC or DC circuit. For AC house outlets, easiest way to test for reversed polarity is to use outlet polarity tester, plug in tester that has three lights indicating correct, reversed polarity, open ground, etc., with reversed polarity light pattern showing hot and neutral swapped. You can also use multimeter, set to AC voltage, measure voltage between hot slot shorter slot and ground, should be about 120 volts, and between neutral longer slot and ground should be near 0 volts, if reversed those readings swapped. For DC circuits like battery or LED, use multimeter set to DC voltage, red probe to supposed positive and black to negative, if reading shows negative voltage, polarity is reversed. For car battery, check color coding, red positive, black negative, and test with multimeter. So how to test for reversed polarity, use outlet tester for AC outlets that shows reversed polarity indication, or multimeter to measure voltage and check sign, with negative reading indicating reversed probes, with testing done with power on for AC but with caution, and with power off for continuity checks, ensuring safety while testing for reversed polarity.
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