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If you don't have a multimeter ask a friend/neighbor if you can borrow theirs. Set it for DC 15 volts and touch the probes to the wiring or inside the socket being careful not to let the probes touch. If polarity is correct the meter will swing up or digital display will show +. If it's incorrect the meter will swing down or a display will show -.
Another option is to pick up an inexpensive polarity tester. They're available at most auto supply and hardware stores.
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