Hi, well you sound like you found your main 100 Amp breaker that feeds the high load 12VDC items like the Generator start motor and the hydraulic jack electric pump......plus in my case..... the rest of the loads that run off the Coach batteries (assuming your 100 Amp is in series with the Coach batteries like mine is). I am attaching a picture of my battery hookup and the 100 Amp breaker is mounted on the wall right side. Note the fuse mounted on the +12v terminal of one battery......it feeds an inverter that I installed since the 2013 ACE 30.1 was not equipped with one.
Sometimes the frustration of looking for these electrical items yourself pays off as you become more intimately familiar with where things are located in your coach. Start your own smart book.....so if anything happens again you know where to go to check for a trip or fault condition. Unfortunately breakers and relays can look quite different from one coach to the next even in the same line.
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