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H4 Bi Xenon HID Twin Relay Wiring Harness.
New style wiring harness for the H4 Bi Xenon HID bulbs, the new style harness comes in two pieces one relay per side. Older style wiring harness had a single relay, took Power from from the battery and left a trailing wire across the car to the other side for the other lamp.
The new harness takes the power from the original H4 plug so no wiring to the battery or earths, much simpler plug and play version.
