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2003 Holiday Rambler Traveler having problem with 12v side (chassis) House side good. It started when battery swelled and spilled acid. I replaced battery and now chassis is completely dead. My question is could the alternator cause this ignition to have no power at all??

SITUATION: No ignition activity (not even a click). Gauges activate with key on, but only Allison panel "N" and dash ABS lights are lit. With key off and out of ignition switch (and even with the ignition switch wire bundle disconnected), the Allison panel "N" and dash ABS lights remain lit. BACKGROUND: In for lift pump replacement due to bad gasket. Motorhome was starting and running okay, but now will not start. There seems to be a total lack of power to ignition system. ANALYSIS: RV tech said it is most likely due to a bad "Monaco #4 Rear PDC" (aka Monaco #4) box (rear passenger side bay) and added that these are common failures due to bad soldering. The box was manufactured by St. Clair Technologies (p/n 100744), but Monaco tech support said these are unavailable (obsoleted in 2007). The Monaco #4 is a relay and fuse panel holding 10 fuses and 6 relays which seem to control ABS, exhaust brakes, and ignition. All relays check good. The box is closed by four brass rivets. Troubleshooting over the phone with Monaco tech support. The Allison "N" and dash ABS lights could be ignition switch issue - ruled out by disconnecting ignition switch wire bundle behind dash. Monaco then said issue most likely with Monaco #4 box, but denounced this as a common failure. When the box is disconnected, the Allison "N" and dash ABS lights are not lit. When the box is reconnected, the ABS LT relay engages with a click, and the Allison "N" and dash ABS lights are lit with or without the ignition switch wire bundle connected. RECOMMENDATION: Request additional troubleshooting steps from forum. Open Monaco #4 to attempt further diagnostics (blindly without schematics). Find replacement Monaco #4 from salvage and begin throwing parts at this problem. I have Google, Bing, and Forum searched this issue to the point of madness finding no hits for Monaco #4 Rear PDC outside of the random and useless results related to BMWs. It seems that if this were such a common point of failure, there would be some hit somewhere. Any assistance is graciously accepted!