Hi precarious,
Unless you've suffered a lightning strike or other electrical mishap, it's more likely that there could be other causes. If the battery was recently removed and replaced, and the connections were put on incorrectly or arced, you may have blown the on-board fuses on the converter. Another very common issue is that the 12V DC mini-circuit breaker near the battery may have tripped and needs to be reset. There's usually a group of breakers covered by red rubber boots. One has a teeny-tiny reset button as pictured below.
As for location, on a North Trail, it may be located behind the circuit breaker and fuse box panel. If the shore power cord plugs in just outside that location, it's very likely to be there.