So, the ACC and IGN worked AFTER you replaced the batteries?
Also, you DID change the Inverter/Charger settings for Lithium batteries? This would not cause your problem. Just want to make sure you know to change the charge parameters when going Lithium.
Also, have you rechecked to make sure you have NOT left a wire loose or misconnected at the battery compartment? This may mean you have to pull the batteries to make sure there is not a loose wire that got pinched and you missed when doing the batteries. I had a customer that replaced his batteries in his Airplane hanger on his 04 Essex and NONE of the 4 slides would work and they were extended and had to pay me for a long distance Service call. Took me 5 minutes to find the cause. His dedicated Slide 12 volt supply wire at the coach batteries was loose and behind the battery tray. He SWORE he doublechecked everything before paying me to come out. Doug
PS, Have you disconnected the shore power AND the coach batteries and then checked for a short?