Aaron. The Coachman Royales are another animal then ones finished by GM. They don't change power supply by the use of a plug. I've had 3 - 78 Royales. 2 of the 3 came with automatic transfer switch's from Coachman. Royal's came with gas water heaters. None Coachman came with electric water heaters. The wiring is different, and heavier.This list goes on. I got a sever course in the way of having to totally take one apart. Then putting it all back together. And how there ground is another story. DO NOT ground one like your homes wiring that you live in. Promise. I know. Just an FYI. Bob Dunahugh 78 Royale