9004 Male and Female Wire Harness One pair harness. Fits 9004 bulbs. Made with 14 gauge wire, one end has male connector, one end has female connector. It is designed to fit between your high wattage bulbs and your factory harness. Protect your car's factory headlight connector from melting from high wattage light bulb upgrade. This wire upgrade is super easy to do, anyone can finish the installation in 5 to 10 minutes.