There IS NO battery control center. I looked up his wiring diagram(s) and, so far, it appears to be the EXACT SAME BATTERY CHARGING SYSTEM as we have in our Diesel coach. Below is the link to his wiring, for his particular coach.The first link applies to his coach and 12V body wiring diagram. The second link is our coach's 12V body wiring diagram.
If you look at mine, my two solenoids are in the upper right corner of the drawing and, it spells out where they're located. But, in his drawing, it does not say where they're located.
Now, as stated earlier, those two solenoids are located inside a hidden panel in our shore power compartment. In Meridians and Journeys, those two solenoids are located in the very front of the coach, on the fire wall. You lift the hood, just above the generator and, you'll see the panel that they are behind.
But, on the OPs coach, I'm not sure where they're located. I'll dig around more.
Scott
http://www.winnebagoind.com/diagram/2007/07_d35j_wire_159727.pdf
http://www.winnebagoind.com/diagram/2004/04_s36gd_wire_147416.pdf