This sounds like the frame fuse from the battery to the converter is open.
Find the fuse.
Press the tiny button on the side and see if it clicks in.
If so everything should work properly again.
Everything powered by pigtail is working, but power from the battery is not getting to or from the converter.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW