I am replacing an older Trane thermostat with a new Honeywell unit. I cannot get the wiring colors right as they were not marked when the old one was removed.

Can I get help on this issue; what color wire is the power wire?

The colors are r-w-y-g-o-b-brn-b-gray on the new thermostat, the letters are rh-rc-w-y-g.

Thank you