Key to Color-Coded Wires in Rain Bird Sprinkler System Rain Bird offers many types of sprinkler systems, and they don't all come with color-coded wires. In those that do, the wire colors reflect the station number the wire controls. In general, the colors start with station 1 with brown and move down the line of stations with red, orange, yellow,.. How to Replace a Sprinkler System's Control Wires | Home As a solution, many homeowners rely on automatic sprinkler control systems to water periodically. The system's control panel has bundled wires that descend into the ground and attach to individual irrigation valves to control each sprinkler's actions. Over time, this control wire bundle may become damaged from weathering and corrosion.