0Jack A Lopez 1 year ago Is it a car radio? If it is, then the colors of the wires ?might? be meaningful. There is a color code, followed by most car radio manufacturers.Here is a link to a DuckDuckGo search for, "car radio wiring colors"https://duckduckgo.com/?q=car+radio+wiring+colors&...If your wires adhere to this code, then: Black is ground. Red is switched +12 VDC. Yellow is constant +12 VDC.