10 Best H4 Relay Harness of 2025

Tested and Reviewed: Top 10 H4 Relay Harness deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

AUTO OCCASION

AUTO OCCASION H4 LED Headlight 2 Head Lamp Relay Socket Ceramic Socket Plugs Set Plug Wiring Harness Fix Dim Lights Light Bulb 9003 H5054 H6054LL 6014 H6024 6052 Replacement for Subaru Toyota

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Editor's bottom line:

“This h4 relay harness is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Application1:Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams,Overloading the Headlight Switch, Overheating Plugs
Application2:If you are upgrading to Halogen Bulbs or are having trouble with your 7"6", 4x6", 5-3/4" or any other H4 plug headlights not working properly, this is your fix!!
Tips:This Harness Bypasses The Power Draw From The Headlight Switch And Pulls The Power Directly From The Cars Battery, But Still Uses The Stock Headlight Switch To Activate The Relays To Turn The Headlights On And Off.
Attention: Please check whether the compatibility information matches your vehicle model
Match Your Original Part Visually:In most cases, you can compare our product's detailed pictures and specifications with your existing part to confirm it is a direct match.

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Picked by 397 people today

9.5

KASLIGHT

KASLIGHT 1Set 2 Headlight Wiring Harness H4 Relay Harness H6054 LED Headlight Connector Socket Kit for 9003 6054 Toyota 95-97 Tacoma 88-95 Pickup Headlamp Fix Dual Light Dim Dual Ground Problem

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Main Highlights

YOUR VEHICLE NEEDS THISPerfectly match old led headlight H6054 H5054 H6054LL 6014 6052 6053 [Fused] [negative switched conversion] vehicles like Toyota, Jeep Pickup, Tacoma, Subaru, Mitsubishi, or Suzuki 7x6 5x7 led headlight harness.
UPGRADE MADE SIMPLEAs Toyota Pickup and Toyota Tocoma use a double ground which leads to the headlights not work or only one beam work, this h4 Harness is a must to fix the problem.Ditch the hassle and save some serious cash by using this h4 wiring harness to flip your headlight system from ground-switched (2 toggled grounds + 1 constant hot) to positive-switched (2 toggled hots + 1 constant ground). Easy peasy!
FIX DIM HEADLIGHT ISSUESThis 1set 2-headlights h4 headlight relay harness Fixes cars with 2 pcs H4 plug headlamps, such as 7x6 5x7 headlights. Problems like Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams can be fixed with this kaslight 2-headlight h4 headlamp relay. Make a big improvement for visibility on your cars at night.
IMPORTANT NOTICEIf your socket pin is not standard, KASLIGHT H4 9003 HB2 Wiring Harness is needed, as To-yota Pickup and To-yota Tocoma use a double ground which leads to the headlights not work or only one beam work, this Harness is a must to fix the problem.
ALSO FIXES: Overloading the Headlight Switch, Overheating Plugs. If you are upgrading to LED Bulbs or are having trouble with your 7"x6"headlight, 4x6"led headlight, 5-3/4" or any other H4 plug headlights not working properly, plug-n-play conversion harness, this is your fix!! Package includes one set h4 socket led headlight relay kit.

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9.5

ONLINE LED STORE

True Mods H6054 H4 LED Headlight Wiring Harness [Negative Switched Conversion] [Fused] Universal H4 Head Light Relay Harness Kit for 9003 H6024 5x7 7x6 4x6 Subaru Toyota Jeep Sealed Beam Headlamp

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Main Highlights

YOUR VEHICLE NEEDS THIS - Swapping out old headlights for LED conversions on negative switched vehicles like Toyota, Subaru, Mitsubishi, or Suzuki, is not a simple job. But with our plug-and-play universal dual H4 headlight relay harness kit for high/low beam it can be! The compatible sockets include: 7x6 5x7 H6024 (2D1 H6054 H5054 H6054LL 6014 6052 6053)|H6024 (2D1)|4x6 6x4 (H4651, H4652, H4656, H4666, H6545)|H5006 (2C1) sealed beam headlights and more!
CONVERSION MADE EASY - Save time, money, and headache by utilizing this wiring harness to convert a negative-trigger ground-switched headlight system (2 toggled grounds + 1 constant hot) to a positive switched headlight system (2 toggled hots + 1 constant ground).
NO LOW-QUALITY PARTS HERE - Designed with two durable relays, high-temperature ceramic headlight sockets, and heat-resistant polycarbonate wire loom. This h4 headlight relay kit with wiring harness is built to last.
THE WAY IT SHOULD BE - We set out to build an LED conversion harness that would install with as little effort as possible. The result? An LED headlight H4 relay harness kit that takes only minutes to install and works every time, be a Jeep CJ7, Cherokee Xj, Wrangler JK or an older Chevy van or TOYOTA Tacoma pickup truck.
PRESERVE YOUR STOCK COMPONENTS - The beauty of this H4 relay conversion harness is that you don't need to cut into your stock wiring harness. This dramatically reduces the install time, and if you need to, even makes the process completely reversible. Trying to restore a hot-rod vehicle or positive switched headlight system? Use this H4 relay harness kit for the headlights!
BRAND-NEW & BACKED 100% brand-new, never used, and covered by a 1-year original manufacturer warranty. Got questions? Hit us upwere here to help.

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9.2

RENMAII-LIGHT

H4 Relay Harness 1set 2 Headlight H6054 6024 9003 5x7 7x6 Led Headlight Relay Wiring Harness Kit for Toyota 95-97 Tacoma 88-95 Pickup Upgrade Led Dual Ground Problem Negative Switched Conversion Kit

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Main Highlights

Designed To Fix Problems Of Dim Headlight, Back Feeding Power, Flickering Headlight And Overheating Plugs And Overheating The Headlight Switch, Malfunctioning H4 9003 Headlights When Using Hi/Low Beams.
As To-yota Pickup Tocoma use a double ground which leads to the headlights not work or only one beam work, this Harness is to fix the problem. run the headlights properly,only because wiring circuit of To-yota series is a little complicated.
Assembly Before You Find Out The Model Of Working Voltage Is 12v, This Headlight Relay Harness Can'T Install And Use 24v Voltage.
Built-In Two Durable Relays, High-Temperature Ceramic Headlight Sockets, Can Well Proect The Car Circuit If There Is Any Abnormal Situation Occur.
This H6054 Led Headlights Wiring Harness H4 9003 Led Headlight Relay Kit Can Be Used For Pickup Tacoma 7x6 5x7 Headlights Upgrade.

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9.0

Ronybuy

Ronybuy H4 Relay Harness 9003 Headlight Relay Wiring Kit Ceramic Socket Plugs for 7x6 5x7 H6054 6054 Headlights Conversion Kit, Fit for Toyota 95-97 Tacoma 88-95 Pickup, Fix Dual Ground Problem

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Main Highlights

FunctionsIf you have trouble with 7x6" , 4x6", or 5-3/4" headlights not working properly, such as dim headlight, back feeding power, flickering headlight and overheating plugs and overheating the headlight switch, malfunctioning H4 9003 headlights when using high low beams,this relay kit can be the solution.
CompatibilityPerfect relay wire harness kit replacement for H4 9003 headlight, H6054 H5054 H6054LL 6014 6052 6053 LED headlights relay conversion kit. With this kit, you will have further and wider visibility to see the deer, wild animals, falling rocks or other obstacles in advance to ensure safer driving at night. 30%-50% brightness improved than before or a new car.
FitmentThe H6054 headlights relay wiring harness H4/9003 led headlight relay kit can be used for pickup 7x6 5x7 headlights upgrade. Fit for Toyota 95-97 Tacoma 88-95 pickup headlights. Plug and play, you can find the wiring diagram in the package.
High QualityThe 40A H4 relay conversion kits is waterproof and come with two relays and ceramic socket plugs which are heat-resistant and corrosion-resistant, durable and stable, can work in any harsh conditions. The built-in 25A fuse ensures the safety and long lifespan.
NoticePlease make sure the working voltage is 12V, since this headlight relay harness doens't fit 24V voltage.If your socket PINs on your vehicle are not standard to guarantee your 4"x6" 7"x6" 5"x7" work normally, the H4 9003 HB2 relay wiring harness is needed.

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8.8

JOYCOURT

H4 Headlight Relay Harness Kit, 2-Headlight Wiring Harness and Ceramic Socket Plug, Fit for for 9003 H5054 H6054LL 6014 H6024 6052 6053 Subaru Headlamp to Fix Dual Ground Problem

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Main Highlights

Function:This headlight relay harness is designed to fix dim headlights, flashing headlights, feedback power, headlight failures when using far/low lights, etc.
High-Quality Material:The relay of the relay harness kit is made of nylon material and has flame retardant performance. The headlight socket is made high temperature resistant ceramic material, the internal use of all copper wire, good conductive performance, and stable transmission, and can be in any abnormal situation to the car circuit for good protection. The harness is wrapped with PVC wire, which has high heat resistance and is not easy to break.
Easy to Use:This headlight relay converts wiring harness and is easy to use. You only need to pre-wire, and then plug and play, there is no need to modify the spare cable.
Wide Application:This 2-headlight h4 headlight relay harness is a replacement for the H6054 H5054 H6054LL 6014 6052 6053 LED headlights and perfectly matches the Tacoma, Mitsubishi, or Suzuki 5X7 LED headlight relay harness.
Package Include:You will receive 1 pack H4 headlight relay wiring harness kit. Note: This headlight relay harness operates on 12 volts and cannot be installed and used on 24 volts.

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8.6

Partsam

Partsam 1Set H4 Headlight Relay Harness Kit for 7x6 5x7 H6054 Headlights Heat Ceramic Wiring Harness Compatible with Pickup Headlights 88-95, Tacoma 95-97 Fix Dual Ground Problem

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Main Highlights

Ideal H4 9003 headlight relay for H6054 H5054 H6054LL 6014 6052 6053 LED headlights replacement, plug-n-play conversion harness, easy to use.
Designed to fix problems of dim headlight, back feeding power, flickering headlight and overheating plugs and overheating the headlight switch, malfunctioning H4 9003 headlights when using Hi/Low Beams.
Built-in two durable relays, high-temperature ceramic headlight sockets, can well proect the car circuit if there is any abnormal situation occur.
This H6054 LED headlights wiring harness H4 9003 led headlight relay kit can be used for Pickup 7x6 5x7 Headlights upgrade.
Assembly before you find out the model of working voltage is 12v, this headlight relay harness can't install and use 24v voltage.

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8.3

O-NEX

O-NEX HID Relay Harness H4 (9003 HB2) 12V 35W/55W Bi-Xenon Hi/Lo H/L Wiring Controller

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Main Highlights

H4 9003 HB2 Bi-Xenon (Hi/Lo) Battery Wiring Harness
Bi-Xenon HID Relay Harness, works with both 35w and 55W HID Kit, heavy duty design.
Dual Beam High and Low (Hi/Lo H/L) functionality for most after-market hid.
1 Harness will connect to both left and right side
For 35W/55W Hi Lo Bi-Xenon type HID installation only.

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8.1

RoadandLord

H4 Headlight Relay Harness Kit for 7x6 5x7 H6054 Headlights, h4 9003 Relay Harness H4 Headlight Relay Kit Compatible with Subaru, 95-97 Tacoma, 88-95 Pickup 4 Runner Fix Dual Ground Problem

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Main Highlights

Troubleshoot: This is a H4/9003 relay wiring harness Designed to fix problems of dim headlight, back feeding power, flickering headlight and overheating plugs and overheating the headlight switch , malfunctioning H4 9003 headlights when using Hi/Low Beams due to new headlight overloading the switch.
Premium Material: Built-in two durable relays, the ceramic plugs wont melt like standard plastic plugs will from the higher heat that halogen bulbs put out., can well protect the car circuit if there is any abnormal situation occur. This H4 headlight wiring harness kit is a direct plug and play with all the correct factory style plugs for the high and low beam headlights.
Fitment: Perfectly match H6054 H5054 H6054LL 6014 6052 6053 7X6 led headlights vehicles like Toyota, Jeep Pickup, Tacoma, Subaru, Mitsubishi, or Suzuki 5X7 led headlight harness.
Important Notice: As Toyota Pickup and Toyota Tocoma use a double ground which leads to the headlights not work or only one beam work, this Harness is a must to fix the problem. It may be still complicated to wire in some new relays to run the headlights properly, TAKE IT EASY, it is not the issue of product quality, only because wiring circuit of Toyota series is a little complicated

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8.1

All Star Truck Parts

[ALL STAR TRUCK PARTS] 4-Headlight Relay Wiring Harness H4 Headlamp Light Bulb Ceramic Socket Plugs Set

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Main Highlights

This Harness Fixes:
Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams
Also fixes: Overloading the Headlight Switch, Overheating Plugs
If you are upgrading to Halogen Bulbs or are having trouble with your 7"6", 4x6", 5-3/4" or any other H4 plug headlights not working properly, this is your fix!!
THIS HARNESS BYPASSES THE POWER DRAW FROM THE HEADLIGHT SWITCH AND PULLS THE POWER DIRECTLY FROM THE CARS BATTERY, BUT STILL USES THE STOCK HEADLIGHT SWITCH TO ACTIVATE THE RELAYS TO TURN THE HEADLIGHTS ON AND OFF.

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Our Best Overall Choice

Best Choice

9.7

AUTO OCCASION

AUTO OCCASION H4 LED Headlight 2 Head Lamp Relay Socket Ceramic Socket Plugs Set Plug Wiring Harness Fix Dim Lights Light Bulb 9003 H5054 H6054LL 6014 H6024 6052 Replacement for Subaru Toyota

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Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Application1:Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams,Overloading the Headlight Switch, Overheating Plugs
Application2:If you are upgrading to Halogen Bulbs or are having trouble with your 7"6", 4x6", 5-3/4" or any other H4 plug headlights not working properly, this is your fix!!
Tips:This Harness Bypasses The Power Draw From The Headlight Switch And Pulls The Power Directly From The Cars Battery, But Still Uses The Stock Headlight Switch To Activate The Relays To Turn The Headlights On And Off.
Attention: Please check whether the compatibility information matches your vehicle model
Match Your Original Part Visually:In most cases, you can compare our product's detailed pictures and specifications with your existing part to confirm it is a direct match.

Show Price

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