T20 7443 W21/5W 580 PRE WIRED LIGHT BULB SOCKET CONNECTOR CARS VANS TRUCKS LED
T20 7443 W21/5W 3 Wire Female Pre-Wired Plastic Light Bulb socket holder (1pc). LEDs are polarity sensitive. If at first they do not illuminate simply remove, turn through 180° and refit. Also, many modern cars now operate canbus systems.