The marker lights should be on when the headlights are on and not otherwise. Parking or opening the entry door should have no effect.
I've seen coaches and trailers that were modified to turn on the markers as campsite decoration. Make sit real easy to find your site in the dark too! Perhaps yours was modified like that?
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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