You haven't really arrived as an experienced trailer-light repair person until the day when you've spent hours and hours in vain trying to fix something...only to find out it was a fuse. Welcome to the sacred club
I finally broke down last week and bought the high-end LED lights for my trailer. I wish I would have done it a lot sooner. Love them! I put a cheap (new) pair of lights on the trailer back in April...by June they were already trashed.
Then I figured "with all the money I spend on this sport...why do I keep skimping on the trailer lights?"
I had no good answer--so I bought the good stuff. Finally!