The lights on a 2017 21 are turned on only with the remote. Do you have the proper one? It is as described a flimsy looking little thing with a few buttons on it. I can't describe it better than that as I am no where near my trailer. The battery in it is cheap and may have gone dead if you are using the proper one. Again the manuals you hopefully got with your trailer are your friends. There is a manual for everything in your trailer, read them and familiarize yourself with troubleshooting things and such, as you will eventually have to do so as you have learned.
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Peace and safe journeys,
Steven M
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