What are the factory 77 caprice stereo wire colors?

The factory stereo wire colors for a 1977 Chevrolet Caprice typically include the following: the constant power wire is usually yellow, the ignition power wire is often red, the ground wire is usually black, and the speaker wires can vary but commonly include blue and green for the front speakers, and gray and purple for the rear speakers. It's always recommended to verify with a wiring diagram specific to the vehicle, as wire colors can vary by model and production changes.