To much current!
With the trailer you are adding the load for all the lights on the trailer.
When the moon is just right and the stars are aligned, it happens. Maybe the fuse has been stressed with the extra load and is just worn out.
Use relays powered from the battery and triggered by the lights. Your problem will disappear.
Good Luck, Travel Safe
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04 Horizon QD, 12 Ford Flex, Excalibar, Brakemaster, Winter Texan, RVin! since 1974
Norm, Donna 01 Z3
Life is a Timed Event, you only get One Go Around!
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