Sounds like you are referring to led tape strips installed in your fifth wheel. Could be happening due to the converter automatic charging sequence going on. Look at the charging led in the breaker panel to see if the brightening/dimming is correlated. Cheap led products are affected by noise, voltage changes as well as emitting noise onto the 12vdc power source. I could believe keystones not using the better led devices due to cost.
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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