Road vibrations take a toll on our RV's, electrical connections are just one of the things that vibrate loose. Start at the main breaker panel and trace voltage along the wire routing until you find the break. Matter of fact, it is a good idea to annually re-tighten all electrical connections that are accessible. Every year at least one breaker panel connection is a little loose in my 5er.
OH, did I mention I hate electrical problems_.
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2000 Winnebago Ultimate Freedom USQ40JD
, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;GS Life member,FMCA
" My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy