2005 sprinter battery issue

[chiraldude]

I have a 2005 sprinter and the aux battery was replaced recently but the cables were connected backwards. I connected them correctly and, at first, there was no charging current getting to the aux battery. I found a couple of blown 30A fuses on the 120V-12V converter and now it charges from shore power fine but still no charging from the alternator. I have been looking for the battery isolator but can't find it. I found something under the driver's seat that could be it but can't be sure. Anyone know where it might be and what it looks like?

[chiraldude]

I found the relay and it does appear to be fried. It must have some internal fuse because, other than the fuses in the power converter, I can't find any other blown fuses.
I am still concerned that something else got fried but haven't found anything except the backup camera which won't turn on now. Everything else seems to be working ok.

[Mike]

Is your van a "vanilla" Sprinter, or was it factory converted into a camper by someone? e.g. Roadtrek
The answers to questions about class b van campers are often make and model specific, so provide as much of that info as possible, if possible. Someone with your type of RV may have had a similar issue and may know the answer.
Welcome aboard, btw.
Not going to ask about the reversed battery connections.