H4/9003 Switching Ground Polarity Module (Pair)

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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. Show more