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Use your ohmmeter/multimeter to check for continuity from one end of the cord to the other through each of the three connectors. You should identify one that isn't making continuity. I'd examine the plugs at both ends for defects in that cord connection.

If you have an AC power detector, you can probably use it to check the length of the cord for the presence of AC power along the cord.

Agree 100% with the continuity test using a multimeter. That's the right way to identify the bad conductor. An AC power detector isn't going to be very informative, as it'll only tell you if the hot wire is intact throughout.
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