Generator runs fine, but no electricity in coach

If this model of Onan continues to run, then it is making power. Assuming circuit breakers are on (and good), then most likely problem is wiring connections in connection box (usually near genset itself), or in transfer switch. I've found most transfer switch problems to be in the time-delay circuit board in x-fer sw. It can often be by-passed with a small dip switch on circuit board. (The switch will engage on generator power, but no time delay)