I have a 2014 Sandsport 25FBX. Cannot find any real information on it which is how I stumbled upon this website. Owned it for a few years with no real problems other than typical maintenance. Recentl...
to the OP, there should be a breaker labeled "conv." or similar for the converter. Turn it off and plug in the trailer. if there are no problems then It's your converter, replace it; it's a simple job.
bestconverter.com talk to Randy He'll set you straight.