So found the issue with the 12 volt system on 233S
When we were bringing our new Roo 233S home last summer I noticed that we had no 12 volt power when we weren't tied to the 120 volt landline. So today I went and grabbed the multimeter and started at the battery and worked my way back. Well I didn't have to go too far to find the issue. It seems that there is a "short stop" circuit breaker just prior to the junction box under the trailer. To add insult I ran out to the local RV parts store to grab a replacement. Armed with a new 30 A circuit breaker, I crawled under the trailer to replace the breaker. I pulled the old breaker only to find that it was a 40 A breaker and that it had a reset button on it. I pushed the reset and low and behold I had 12 volt power.
I return to the RV parts store to swap the 30 A for a 40 A because the repair guy said they have a tendency to blow. So now I have a spare.