Seller notes

This is for Size H4 / 9003 Best used with S-v.4, GTR Lighting LED bulbs, or Morimoto 2Stroke 3.0 For use with LED headlight bulbs, or 35w HID ballasts. Prevents bulb out warnings or flickering.Many newer vehicles use a technology called PWM to operate the different lighting systems in a vehicle. PWM stands for Pulse Width Modulation and it allows for halogen bulb dimming, reducing alternator/battery electrical usage load, and is a very popular control method in modern vehicles.For example 2009 a...

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