Welcome to JOF
Being an IOTA converter/charger, what year/model Jayco do you have? 30amp or 50amp?
I'm not an electrical guy, but it sounds like your IOTA is toast. I'm sure some of JOF's electro-guru's will chime in shortly.
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)