Were you plugged into shore power when you did this?
If you were NOT: then you totally killed the batteries which very likely are/were, in need of replacement anyway.. OR you burned out something in the negative lead (The lead it self or a fuse or a shunt, NORMALLY there are no fuses in the negative lead on the battery however)
Easy way to test for problems in negative lead.. Run a automotive jumper cable from teh battery NEGATIVE (be very very sure it is the negative) to the frame and see if genny starts. IF so problem in negative side of life.
IF you were plugged in then there is very likely a fuse or circuit breaker, in fact there may be 2 or 3 or as many as five. scattered about. INSIDE the converter (or on it's assoicated fuse panel) are "Reverse polarity Fuses" designed to blow if the batteries are installed backwards, these fuses are usually 30 amp and you may have 1, 2 or 3 of them.
On my Coach the diagram for the Intelletec Battery Control Center says that there are two PUSH (and I mean Push HARD) to reset breakers in the bottom of the BCC, accessible without opening the BCC.. In my case, I do not have them, I have a 80 amp thermal self-resetting breaker next to the BCC There may also be a disaster fuse.. I have two battery banks and an inverter, the inverter connected directly to both banks via a disaster fuse. I did something not unlike what you did, (not plugged in though) and popped one of those sixty dollar fuses (OUCH!!!!). when I put in my new DEKA's a few months back.
