When that fuse blows it also prevents the tow vehicle from charging the trailer battery. Dumb, dumb, dumb! I took the jack wire off from that hookup and took it directly to the battery. It took about three feet of ten gauge wire, a ring connector, a butt connector and a couple cable ties.
If you have the Lippert tongue jack it has a 20 amp automatic breaker built in.
2018 Jayco Jay Flight 21QB
2012 F150 Ecoboost Crewcab
Amateur Radio K3EXU
Moderator on Hi-Lo Trailer Forum