Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Starting and stopping a genset with a load on it is very hard on both the genset and the load. You should never start or stop it with a load on it.
This could be a lot of different things - the genset not producing any power, a bad circuit breaker on the genset, bad transfer switch, bad circuit breaker in the coach, or even burnt appliances.