I'm a believer in a VOM. The lights work on battery and ground with the filament of the lamp in between. I would break out the meter and see if you lost the power from the connector or the ground at the trailer.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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