I would recommend you get a multi-tester for use whenever there is a question about wiring. Test for AC in the 120 volt range first, then DC in the 10 to 20 volt range.
Another tester is a live wire tester. Looks like a pen and can show if Ac wire is "hot" without touching the wire.
the multi-tester is also good for checking your battery voltage, polarity of wiring and weather a switch or wire is working.
Based on your description it is most likely 12 volt wiring. But testing it first is always good. Jayco does screwy things when wiring these trailers.
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