Welcome to the forum. Check the plug on your camper and make sure there is not a jumper wire between the auxiliary power connection and the marker light connection, the upper left and upper right connections in this photo.
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2013 Silverado 2500HD LTZ CC 6.6L Duramax Diesel
2023 Rockwood 2445WS
Buster, miniature Dachshund
2024: 3 trips, 27 nights in 9 states, 5067 miles
2023: 9 trips, 48 nights in 12 states, 2 provinces, 8120 miles
2019: 7 trips, 43 nights in 6 states, 3904 miles
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