Jerry, those that show their rig type in their signitures are not just doing it to brag, it helps answer questions like these.
I checked your profile and see you have an '86 Minnie Winnie. While I don't have any direct experience with that make or model, my guess is for that year and model you do have to plug a cord, possibly your shore cord, into the generator directly. If it's the shorecord you should have a recepticle on or next to the genny to accept it.
Jay & Peggy Monroe with Dolly
Can't take it with you - don't plan on leaving any behind
2016 Newmar London Aire 4553, Spartan chassis
Wrangler Unlimited toad