It should be located in the same box as your power cord for shore power. You might not have a cable so you will have to get one. I have a 23u and it's straight up on the inside of the electrical compartment. I know, I'm a little late but didn't see a reply so thought I'd chime in. Cheers
Ahh, just saw that you did get a reply from another 23u owner. I'll still leave this message in agreement.
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