Yellow is power with the ignition in run or accessory. Gray is dash lamps, changes with the dimmer knob on the headlight switch. Brown is parking lamps (dims the display with the headlights on) keep in mind there is another brown wire that is a speaker wire. Orange is for the clock and memory presets. There is also a pink wire for power antenna trigger. It’s so much easier just to buy the adapter harness. Of course that’s not an option if the plug has already been cut off.