I have a classic kiwi homebuilt trailer from the 80s, shared among the family. Lights are currently incandescent. Family members have been having trouble with the trailer lights causing errors in their modern cars, and indeed blew the brake light fuse in a 2016 model car last week. My 2002 car doesn't have any issues, and a quick inspection shows that there is no obvious damage to the cables or corrosion on the bulb fittings.
The obvious option is to get a trailer light converter installed in each modern car that regularly uses the trailer. But we'll probably need at least two cars fitted, and still presents problems when extended family uses it.
What I'm thinking is to upgrade the trailer's lights to LED, which should hopefully reduce the current load to a point where modern cars don't notice it, and don't throw up an error or blown fuse. One LED conversion kit has got to be cheaper and easier than 2-3 trailer light converters.
Does this sound like it will work?