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Rectangular black relay box with multiple wiring connectors extending from sides

XtremeVision

XtremeVision H13-HARNESS-4-XT 9004 Bi-Xenon Relay Harness electronic

SKU CH-1WF8-8W7Q4 MPN H13-HARNESS-4-XT

Plug-and-play relay harness powers 35 W or 55 W bi-xenon HID bulbs with reliable high/low beam switching from a single unit

  • Overall height1.0 in (2.54 cm)
  • Product weight5 oz
  • Plug-and-play relay harness installs without extra battery wiring
  • Powers dual-beam HID bulbs for reliable high/low beam switching
  • Draws direct battery power to prevent HID flickering
  • Compatible with 35 W HID conversion kits only
  • Single harness covers both driver and passenger headlights

9004 Bi-Xenon Relay Harness for 35 W HID Kits

This plug-and-play harness connects dual-beam HID bulbs to the factory socket and draws power directly from the battery. It enables reliable high/low beam switching without extra wiring to the battery. Designed exclusively for 35 W conversion kits, it is not compatible with 55 W systems. One harness covers both front headlights.

Power limited to 35 watt HID conversion kits

The harness only supports 35 W HID kits and will not operate correctly with 55 W kits. It connects straight to the OEM 9004 socket to provide a constant energy source that prevents bulb flicker. No additional battery wiring is required for installation. The relay handles the high/low beam transition for dual-beam bulbs.

Compact relay unit with factory socket connectors

The harness measures 14 x 1 x 1 inches and weighs 3.98 ounces, fitting easily behind the headlight assembly. Its plug-and-play design uses the existing 9004 connector for a secure, weather-resistant link. A two-year manufacturer warranty covers the relay and wiring. Not suitable for vehicles requiring 55 watt HID power.

How it compares

Measured against everything we stock in Diagnostic Tools & RV Electronics, at today’s prices. Recalculated every night.

Price $9.99
Cheaper than about 74% of the 432 comparable items (median $18.99).

Specifications

Product
Brand nameXtremeVision
Model nameH13-HARNESS-4-XT
Size & build
Overall height1.0 in (2.54 cm)
Product weight5 oz

Questions about this item

Should I choose the 35 W or 55 W HID kit for this harness?

The harness is compatible with only 35 W HID conversion kits; 55 W kits are not supported.

What does the 9004 Bi-Xenon label mean for daily driving?

It allows a single harness to switch both high and low beams through the factory socket while drawing steady power from the battery to stop flicker.

How does the relay harness connect to the vehicle electrical system?

It plugs directly into the OEM 9004 socket with no extra wiring to the battery required.

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