There are not a lot of boat trailers that require a 12 volt circuit but regardless it may not be a fuse you are looking for but a relay. Consult the vehicle owners manual for the locations of all fuses/relays associated with the factory tow package wiring. If there is a relay for the 12 volt circuit then the only way to really test it is to put a known good relay in its place. The manual will also cover any fuses you may have missed.
If your Mountaineer came with a 4-Way and you are using... view full answer...
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