Northern Lite 9-6 Q Classic converter/charger help/questions

Maybe you can try this...

If you can pull the wire(s) at the battery box and get movement up front at the converter... You could take a heavier gauge wire and splice it into the existing wire and solder the splice and overcover that splice with heat shrink tube (so you could pull the assembled wires back through the camper to the battery box...so long as the existing wire will move, that is... Just a thought.