Wires coming out of taillight

[ericpeltier]

I have a 1972 Streamline that I'm working on. Mice have chewed up the wires. I blame this guy.

My taillights each have 3 lenses. Red, White, Red. The existing bulbs behind the red lenses were two-filament. The existing bulb behind the white lens was one-filament.

So I'm re-wiring. Clearly, chassis is ground. Coming out of the CURBSIDE light pod are three wires, green, brown, black. My guesses are:

Green: Right Turn Signal
Brown: Running
Black: Backup

Am I on the right track?

Thanks!