The older style RV usually had a plug (female receptacle) in one of the storage bays. Probably the bay where the power cord enters. When you plug into shore power, the plug goes to the receptacle on the pedestal. When you need the generator, the plug goes into the receptacle in the storage bay. If you don't plug the cord into the receptacle, the generator will run but will not connect (power up)
Look in your electric bay or one of the others see if you can find something like this
Plug your shore cord into it to power the RV from the generator
