H4 hid relay harness 1.HID wire harness for HID H4H/L kit 2. Easy instll& wholesale price 3.Make HID work more stable hid relay harnesshigh ... when installing the HID xenon kit. Protect the battery, HID bulb and ballast. Transmit enough current for HID lamp, make HID work more stable2 ... quality, 100% test before shipment we also have other series HID wire harness , such as items:H1(H3),H4,H7,9004(9007 ...