Hopefully someone with a comparable model can chime in, although even coaches of the same year and model can tend to have different wiring and options.
That being said, the Carling rocker switches have a number printed on the side of the body that defines all the characteristics of the switch, including what each terminal is. Knowing what the terminals are, might help to work backwards to figure out the wiring.
I’ve been doing some wiring with rocker switches lately, and if I recall for the standard V1D1 single pole switch, typically terminal 8 is the negative, and terminal 7 is for the independent backlight. Terminal 3 is common (+) in and 1 and 5 are (+) out.
Here is the Carling Data Sheet that breaks down all the digits in the part number for the Contura II & III switches, along with wiring diagrams: https://www.carlingtech.com/sites/de..._datasheet.pdf
All the best with your project!