The converter will provide 12 VDC power without batteries connected to the system. If I were you, I'd first disconnect the batteries (yes, if they were dry, they need to be load tested and specific gravity needs to be checked and even then, they may be "toast"). Once the batteries are no longer electrically connected, plug into shore power and you should have lights that do not flicker. If so, then it's your battery/batteries that are causing the problem. If the lights flicker without the batteries, then you may also have problems with your converter which might have been damaged by the "dry batteries".
Don't forget, with no battery connected, do not activate your slides, landing gear, awning motor switches. The heavy load from those devices requires a battery in the circuit to prevent overloading the converter. You'll be OK with operation of the lights, furnace and refrigerator with no battery, at least temporarily, while you're troubleshooting the system.
You may have "spread fuse sockets" or "loose terminal wiring screws" but I'd suspect that with "dry batteries" your problem is first, the batteries and possibly a "toasted converter" from being overloaded by the bad batteries.
Let us know what you find.....
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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