I see there is a connector in the picture that says "to headlamp socket" would that go into the original headlight socket? If so which side?

The black connector plugs into the female wiring socket that you removed from one of the headlights. The two yellow male terminals get plugged into the back of headlights. You will have to install the black connector into the headlight harness on the side nearest the battery. Mount the relays, battery feed and that side's ground strap in the same area. The long extension to the other headlight gets into the back of the headlight after you removed the terminal. Install that side's ground. That original female terminal that was on that headlight will no longer be used. Tape it up and secure out of the way.

Does this work with a 1986 Toyota pickup?

Yes it does I have it on my 88 4runner

Does this work on 2004 honda crv?

Probably don’t need it. This is for very old vehicles that Cannot regulate the amperage to the LEDs. If your LED lamps flicker when you install them, this should solve it though....... I think.

Will this relay kit work on a 1992 Dodge D-250 Diesel?

Sorry, the fitment said not fit your car.

H4 9003 Headlight Relay Wiring Harness Kit Dual High Low

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Description

🚗 Light Up Your Drive with Confidence and Style!

HEAT NO SWEAT - High heat ceramic plugs prevent overheating and melting, ensuring long-lasting safety and performance.
PLUG PLAY SIMPLICITY - Pre-wired harness means zero wire splicing—upgrade your lighting in minutes, no mechanic needed.
BUILT IN FUSE PROTECTION - Integrated fuse safeguards your circuit from power surges, giving you peace of mind on every drive.
UNIVERSAL FIT FOR H 4 9003 - Compatible with a wide range of vehicles and headlight models, including Jeep Wrangler and Toyota Pickup.
POWER UP WITHOUT COMPROMISE - Dual 80A waterproof relays deliver robust, reliable current for brighter, flicker-free headlights.

The Partsam H4 9003 Headlight Relay Wiring Harness Kit is a premium upgrade designed to fix dim, flickering, and overheating headlight issues. Featuring dual 80A waterproof relays, high heat resistant ceramic plugs, and a built-in fuse, this pre-wired plug-and-play harness fits a broad range of H4/9003 headlights and popular vehicles like Jeep Wrangler and Toyota Pickup. It enhances headlight performance, extends wiring lifespan, and ensures safer, brighter night driving.

Reviews

J**E

Great product works tremendously well and easy to install and great quality!

17.08.2025

M**K

Parts of relays have started to rust after 2 months. One of the relays came faulty and sparks. This could cause a serious issue.

13.03.2022

G**Y

Wiring upgrade.

4.11.2020

J**.

Buen producto,funcionando a la perfección, instalación de baja dificultad en la XJ,solo fue necesario tirar un cable desde el tablero para conectar las DRL al encendido,y con su propio switch de encendido/apagado,en mi caso tome la corriente que alimenta la radio ya que lo tengo instalado directamente a la bateria.solo quedaria pendiente esperar a ver como sigue funcionando con el tiempo.

9.12.2025

D**E

Love it

5.04.2019

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$52.57

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Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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ASIN	B078XV8PL7
Brand Name	Partsam
Cable Type	Coaxial
Connector Type	H4
Customer Reviews	4.4 4.4 out of 5 stars (524)
Item Weight	0.31 Kilograms
Manufacturer	Partsam
Material Type	Ceramic
Model	GTCV-0440275598
Part Number	GTCV-0440275598

H4 9003 Headlight Relay Wiring Harness Kit Dual High Low Beam Headlamp w/High Heat Ceramic Plugs

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