The short answer is: Yes, you can pigtail 3 wires, provided that you follow certain guidelines to ensure a safe connection. Pigtailing three wires is a common practice in many electrical applications, such as connecting multiple fixtures to a single circuit. ” This method is especially useful when connecting wires to devices such as switches, outlets, and junction boxes, allowing. Browse 3 wire pigtail harnesses for trucks, trailers, and boats. Quick disconnect connectors available now. ” A standard residential grade outlet has only two screw terminals for the hot wires and two for the neutral wires, which is insufficient for three separate cables.