The wiring on your trailer is correct. The Breakaway Switch # C52010 does get wired directly to the battery without a fuse or circuit breaker. This ensures that in the event the trailer becomes disconnected the brakes activate. A circuit breaker could fail resulting in a failure for the braking system to activate correctly.
Personally, I recommend removing the battery when in storage and placing it on a Maintainer # 329-GENIUS1 at home. This helps to extend battery life and will reduce... view full answer...