Bi-xenon Relay: GTR Pro (9003/H4) Ford The harness also includes an

The harness also includes an input line that's ideal for use with upfitter switches

No drilling your OEM covers

therefore everything about a Hylux ballast is better: Faster warmup time

or Alpha-Black finishes to match your style

Bi-xenon Relay: GTR Pro (9003/H4) Ford The harness also includes anReality Check: Customers often ask, Do I really need a harness? Yes! A relay harness is designed to deliver steady voltage to your HID ballasts directly from the car battery. Nobody likes a flickering headlight, so why risk it? Factory headlight outputs are really only designed to power a halogen light bub, not an HID ballast. Under Control: GTR Lighting makes it easy with the H4 Bi xenon relay harness. Designed to be completely plug n play; it's a