I'm selling my house and I need to install a few GFCI's before the new buyers move in. House was built in 1964, has Greenfield wiring, and the fusebox was replaced to a breaker box a few years ago. I have wired in new outlets before, installed a few light fixtures and a couple ceiling fans so I'm (somewhat) familiar with wiring. So on to my problem: I pulled out the standard outlet and put in the GFCI (put the wires in the same location) and my circuit tester is showing hot/neutral reversed. What did I do wrong?
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