I have made two attempts to install a sensi thermostat controller In our 1993 sea ray 40’ Express Cruiser. I know now that the black wire is hot. The white wire is common based on what was written in the manual. They said there is a green wire for ground but I do not have a green wire I’m assuming the bear wire is ground. Does anybody know where the red wire goes on the sensi? The manual does not say what the red wire is?