I had (I think) similar problem. To get the 12v stuff up and running I had to do a "hard" reset on the invertor/convertor. I unpluged my unit, then took off ALL of the pos and neg cables from all batteries. Waited about one min. rehooked up battery cables, plugged unit back in, all was working as should.
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S.O.B.
Retired and never looked back
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