Have RV Questions? Ask an RV Mechanic Online.
What is the model of the water heater you bought? What is the make and model of the one you took out? Get back to me with this and I can assist you further here.
You didn't make a note of the way they were hooked up before?
Are you sure that the old one wasn't an Atwood model?
The colors you mentioned as being on the coach are Atwood colors.
I will opt out of this as I have to get to work and won't be available until later this evening. I have my own RV shop. Hopefully, another tech here will jump in soon.
I see nobody picked up on this..............so I will try to continue here. I am adding a link to the Atwood Water Heater Manual and see the wiring diagrams towards the back. Orange is a color they use. And one way you might tell is to look at the switch inside. Does it say "Atwood" or "Suburban" on it? http://bryantrv.com/docs2/docs/atwoodwaterheater.pdf
Great! Thanks for letting me know.............