H4/9003 Switching Ground Polarity Module (Pair)

Are you converting your headlights to HID or LED and having an issue with them not turning on or only one side working? This is a very common problem on older cars, trucks and SUVs that use H4, 9003 and HB2 light bulbs.

These are simply designed as a ground switching module to create a simple plug-and-play solution for most vehicles using an industry standard H4/9003/HB2 headlight plug with a switching ground when going from low to high beam.