The breakaway switch connects directly to the battery, not the 7-pin connector. Why would it? If the trailer breaks away from theTV, including the electrical connector, you want the trailer brakes to lock up with full battery(trailer) voltage.
Derek, if the fuse popped, the trailer brakes would not operate at all. I don't think the switch is even fused, but may be. I have never seen one on either trailer I have owned. The only switch I've found is the 30A one that goes to the trailer.
2013 F250 XLT
I now have a Keystone Outback, but I try to help when I can.
Bitter Gun Owner