Best Honda Relay Conversion Kits

Looking for the best Honda relay conversion kits? We’ve tested and reviewed the top 10 options to help you find the perfect upgrade for your car.

Honda relay conversion kits are a must-have upgrade for older Honda and Acura models. These kits fix common starting problems and improve fuel efficiency.

We’ve tested and reviewed the best Honda relay conversion kits to help you find the perfect fit for your car. With easy installation and reliable performance, these kits will keep your car running smoothly and safely.

List of Top 10 Honda Relay Conversion Kits

Title	Best For	Price
Farpida Main Relay Conversion Kit with Kill Switch fit for Honda Civic 1992-2001,CRV 1997-2001, Integra 1994-2001, Accord 1990-2002, Prelude 1992-2001	This Farpida Main Relay Conversion Kit is perfect for Honda owners who want a reliable and easy upgrade. It’s great for DIYers looking for a quick fix with no hassle.	View on Amazon (paid link)
Vkinman Main Relay Conversion Kit with Kill Switch, Replacement for Honda Civic CR-V Accord Prelude 1990-2002, Acura Integra CL TL 1994-2001	This Vkinman Main Relay Conversion Kit is perfect for Honda and Acura owners who want a reliable and easy upgrade. It’s great for DIYers looking to save time and money with a simple plug-and-play installation.	View on Amazon (paid link)
ZUDKSUY RZ-0063 Main Relay Conversion Kit, Replacement for Honda Civic/CRX 1988-1991, Replacement for Acura Integra 1986-1993, Replaces 39400-SH3-003	This kit is perfect for drivers who want a quick, simple fix for an old or failing relay. It’s great for anyone who needs a strong, easy-to-install upgrade to keep their car running smooth.	View on Amazon (paid link)
XYgdhqpt 39400-SH3-003 RZ-0063 Main Relay Conversion Kit,Plug and Play	This Main Relay Conversion Kit is perfect for Honda/Acura owners who need a simple, plug-and-play solution to replace their old main relay. It’s ideal for DIY enthusiasts looking for a direct fit with no modifications needed.	View on Amazon (paid link)
Main Relay Conversion Kit Compatible with 92-01 Civic, 94-01 Integra, 97-01 CRV, 93-97 Delsol, 90-02 Accord, 97-99 A cura Cl, 95-98 A cura Tl, 92-01 Prelude	This kit is perfect for Honda and Acura owners who want a fast, simple fix for a weak relay. It’s great for anyone who wants easy install, better reliability, and a safe stop switch for extra peace of mind.	View on Amazon (paid link)
XYgdhqpt Main Relay Conversion Kit for Compatible with 92-01 Civic,94-01 Integra,97-01Crv,90-02 Accord,Main Relay Harness 39400-S10-003,39400-SR3-003	This kit is perfect for anyone who wants a quick fix for starting issues and better electrical performance in their Honda or Acura. It’s great for drivers who want a simple, plug‑and‑play upgrade they can trust.	View on Amazon (paid link)
DVPARTS Main Relay Conversion kit 39400-SH3-003 RZ-0063 for Honda	This DVPARTS Main Relay Conversion Kit is perfect for Honda owners who need a reliable replacement part. It’s easy to install and works great for older Honda models like the Civic, CRX, Integra, Legend, Vigor, Accord, and Prelude.	View on Amazon (paid link)
EATAKWARD Main Relay Conversion Kit, Replacement for Honda Accord Civic 1992-2001, Replacement for Honda CR-V Integra 1994-2001	This EATAKWARD Main Relay Conversion Kit is perfect for Honda owners who want a reliable and easy fix for their car’s start-up problems. It’s great for DIYers looking for a simple, plug-and-play solution.	View on Amazon (paid link)
Main Relay Conversion Kit 39400-S10-003 Fit for Honda Civic CRV Integra	This kit is perfect for drivers who want smooth starts and a steady power flow in their Honda or Acura. It’s great for anyone who wants a quick fix that boosts reliability without any hard work.	View on Amazon (paid link)
X AUTOHAUX Male Main Relay Kit 5-Blade for Honda Civic 1992-2001,for Honda CRV 1997-2001, for Acura CL 1997-2003 Main Relay Harness 39400-S10-003, 39400-SR3-003	This main relay kit is perfect for car owners who need a reliable replacement for their Honda or Acura. It’s easy to install and works with many models from 1990 to 2005.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Honda Relay Conversion Kits handpicked for reliability and performance. Each kit is easy to install and designed to fix common starting issues, ensuring your Honda runs smoothly. Find the perfect fit for your model and enjoy peace of mind on the road.

1. Farpida Main Relay Conversion Kit with Kill Switch fit for Honda Civic 1992-2001,CRV 1997-2001, Integra 1994-2001, Accord 1990-2002, Prelude 1992-2001

Farpida Main Relay Conversion Kit with Kill Switch fit for Honda Civic 1992-2001,CRV 1997-2001, Integra 1994-2001, Accord 1990-2002, Prelude 1992-2001

The Farpida Main Relay Conversion Kit is a perfect fit for Honda models like the Civic, CRV, Integra, Accord, and Prelude. It replaces OE part numbers 39400-S10-003 and 39400-SR3-003. This kit includes a kill switch for added control.

It’s easy to install, with a direct replacement design that stays firm. Made with insulating materials and high-quality copper cores, it ensures reliability and durability.

Pros	Cons
Fits multiple Honda models, ensuring wide compatibility. Easy installation, direct replacement, ready to use. High-quality materials for reliability and durability. 24/7 customer service for hassle-free support.	May not fit non-Honda models perfectly Requires basic car knowledge for installation Kill switch might confuse some users at first

Perfect For:

This Farpida Main Relay Conversion Kit is perfect for Honda owners who want a reliable and easy upgrade. It’s great for DIYers looking for a quick fix with no hassle.

Ready to Purchase?

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2. Vkinman Main Relay Conversion Kit with Kill Switch, Replacement for Honda Civic CR-V Accord Prelude 1990-2002, Acura Integra CL TL 1994-2001

The Vkinman Main Relay Conversion Kit is a perfect fit for many Honda and Acura models. It works with cars like the Civic, Accord, and Integra. This kit is designed for easy use.

It’s plug-and-play, so no tools are needed. Just swap the old relay for the new one. The kill switch adds extra security.

The 4-pin relays ensure stable connections. The 6-foot kill switch lets you hide it easily. This kit keeps your car safe and running smoothly.

Pros	Cons
Plug-and-play design for quick, easy installation. Reliable 4-pin relays ensure stable electrical connections. Built-in kill switch boosts vehicle security instantly. Fits multiple Honda & Acura models for wide compatibility.	May not fit all trim levels Kill switch cable could feel too long Relay swap still needs basic care during install

Perfect For:

This Vkinman Main Relay Conversion Kit is perfect for Honda and Acura owners who want a reliable and easy upgrade. It’s great for DIYers looking to save time and money with a simple plug-and-play installation.

Ready to Purchase?

View Price on Amazon (paid link)

3. ZUDKSUY RZ-0063 Main Relay Conversion Kit, Replacement for Honda Civic/CRX 1988-1991, Replacement for Acura Integra 1986-1993, Replaces 39400-SH3-003

ZUDKSUY RZ-0063 Main Relay Conversion Kit, Replacement for Honda Civic/CRX 1988-1991, Replacement for Acura Integra 1986-1993, Replaces 39400-SH3-003

The ZUDKSUY RZ-0063 Main Relay Conversion Kit is a perfect fit for older Honda and Acura models. It replaces the old main relay in your car. This kit is easy to install and works great.

This kit is built to last with strong materials. It handles daily driving without issues. The relay switch and mounting bracket ensure long-lasting performance.

By using this kit, you can improve fuel efficiency. A properly working main relay helps your engine run better. The plug-and-play design makes installation quick and simple.

Pros	Cons
Fits many Honda and Acura models Strong build for daily use Boosts fuel efficiency Quick plug‑and‑play setup Saves time with easy install	Not fit for OBD1/OBD2 plug May need extra checks for older models Basic design offers no added features

Perfect For:

This kit is perfect for drivers who want a quick, simple fix for an old or failing relay. It’s great for anyone who needs a strong, easy-to-install upgrade to keep their car running smooth.

Ready to Purchase?

View Price on Amazon (paid link)

4. XYgdhqpt 39400-SH3-003 RZ-0063 Main Relay Conversion Kit,Plug and Play

The XYgdhqpt 39400-SH3-003 RZ-0063 Main Relay Conversion Kit is a plug-and-play solution for your car. It works with Honda/Acura models from the 80s and 90s.

This kit converts old main relays to a standard relay switch. It fits most Honda/Acura vehicles with an OBD0 plug. No modifications are needed for installation.

The package includes a relay switch, mounting bracket, and conversion harness. Installation is simple and direct. Always verify compatibility before buying.

Pros	Cons
Fits many Honda and Acura models Easy plug-and-play setup No mods needed Reliable relay upgrade Clear parts check reminder	Not universal: Only works with specific Honda/Acura models. No instructions: Installation guide not included, might confuse beginners. Verification needed: Must double-check compatibility before buying.

Perfect For:

This Main Relay Conversion Kit is perfect for Honda/Acura owners who need a simple, plug-and-play solution to replace their old main relay. It’s ideal for DIY enthusiasts looking for a direct fit with no modifications needed.

Ready to Purchase?

View Price on Amazon (paid link)

5. Main Relay Conversion Kit Compatible with 92-01 Civic, 94-01 Integra, 97-01 CRV, 93-97 Delsol, 90-02 Accord, 97-99 A cura Cl, 95-98 A cura Tl, 92-01 Prelude

Main Relay Conversion Kit fits many Honda and Acura models. It works with plug and play ease.

It uses a Bosch style 4 pin relay. The kill switch adds extra control and peace of mind.

It is made with strong parts. It is built for long life. It helps keep your car ready to go.

Pros	Cons
Plug-and-play upgrade—no tools, no hassle, just swap and go. Fits multiple models, saving time and money on compatibility checks. Built-in kill switch boosts security with a 6FT cable. Reliable Bosch relay outperforms factory parts, prevents costly failures. Durable materials ensure long-lasting performance in tough conditions.	No instructions included, might confuse first-time installers. Kill switch could be easily found if not hidden well. Not compatible with all Honda/Acura models, check before buying.

Perfect For:

This kit is perfect for Honda and Acura owners who want a fast, simple fix for a weak relay. It’s great for anyone who wants easy install, better reliability, and a safe stop switch for extra peace of mind.

Ready to Purchase?

View Price on Amazon (paid link)

6. XYgdhqpt Main Relay Conversion Kit for Compatible with 92-01 Civic,94-01 Integra,97-01Crv,90-02 Accord,Main Relay Harness 39400-S10-003,39400-SR3-003

XYgdhqpt Main Relay Conversion Kit for Compatible with 92-01 Civic,94-01 Integra,97-01Crv,90-02 Accord,Main Relay Harness 39400-S10-003,39400-SR3-003

The XYgdhqpt Main Relay Conversion Kit is a must-have upgrade for Honda and Acura owners. It fixes common starting problems caused by old main relays. This kit works with many models, from the 1990 Accord to the 2005 S2000.

The kit includes a standard relay switch and a conversion harness. It’s easy to install, with a plug-and-play design. Made from durable materials, it ensures reliable performance and enhanced safety for your vehicle.

Pros	Cons
Fits many Honda/Acura models, solving common starting issues. High-quality materials ensure durability and reliability. Plug-and-play installation, no complex tools needed. Enhances electrical performance, boosting driving safety.	Fit risk for many Honda and Acura models No brand trust from a known maker Basic parts may wear out faster

Perfect For:

This kit is perfect for anyone who wants a quick fix for starting issues and better electrical performance in their Honda or Acura. It’s great for drivers who want a simple, plug‑and‑play upgrade they can trust.

Ready to Purchase?

View Price on Amazon (paid link)

7. DVPARTS Main Relay Conversion kit 39400-SH3-003 RZ-0063 for Honda

The DVPARTS Main Relay Conversion Kit is a must-have upgrade for older Honda models. It replaces the original relay with a high-quality alternative. This kit is designed for easy installation.

Compatible with multiple Honda vehicles, it fits 88-91 Civic/Crx, 86-93 Integra, and more. The part number 39400-SH3-003 RZ-0063 ensures a perfect match for your car. With 14V 40A specifications, it meets Honda’s standards.

This brand-new kit offers reliable performance and peace of mind. High-quality materials and good service make it a smart choice.

Pros	Cons
Fits many Honda models, saving you time and money. Brand new part with high quality for reliable performance. Easy to install with clear specifications: 14V 40A. Great service ensures a smooth buying experience.	May not fit all Honda trims Needs care during install No extra add‑on features

Perfect For:

This DVPARTS Main Relay Conversion Kit is perfect for Honda owners who need a reliable replacement part. It’s easy to install and works great for older Honda models like the Civic, CRX, Integra, Legend, Vigor, Accord, and Prelude.

Ready to Purchase?

View Price on Amazon (paid link)

8. EATAKWARD Main Relay Conversion Kit, Replacement for Honda Accord Civic 1992-2001, Replacement for Honda CR-V Integra 1994-2001

This kit gives your Honda a smooth and steady start. It fits Accord, Civic, CR‑V, and Integra models from 1992–2001 with ease.

It installs fast. It runs steady. It boosts circuit life.

Pros	Cons
Fits many Honda models, saving you time and money. Plug-and-play design for quick, hassle-free installation. Reliable performance for smooth, daily driving. Reduces start-up problems, improving your vehicle’s stability.	Not universal: Only fits specific Honda models from the 90s. No tools included: You’ll need your own basic tools for installation. Single component: Only replaces the main relay, not other parts.

Perfect For:

This EATAKWARD Main Relay Conversion Kit is perfect for Honda owners who want a reliable and easy fix for their car’s start-up problems. It’s great for DIYers looking for a simple, plug-and-play solution.

Ready to Purchase?

View Price on Amazon (paid link)

9. Main Relay Conversion Kit 39400-S10-003 Fit for Honda Civic CRV Integra

The Main Relay Conversion Kit fixes starting problems in older Honda and Acura cars. It gives stable power to avoid hard starts. This kit is easy to install and saves you time and money.

It uses upgraded materials to handle extreme conditions. The solder joints are strong and won’t crack. This ensures long-term reliability for your car’s electrical system.

Fits Honda Civic, CRV, Accord, and more. Works with Acura Integra, TL, and CL. Simple plug-and-play installation—no tools needed.

Pros	Cons
Boosts starting power for reliable car ignition. Upgrades electrical system, cuts breakdowns. Fits multiple Honda/Acura models perfectly. Durable materials, handles extreme conditions. Easy DIY install, saves time and money.	Not universal: Only fits specific Honda and Acura models. No tools included: Requires basic tools for installation. Single relay: Limited to one relay per kit.

Perfect For:

This kit is perfect for drivers who want smooth starts and a steady power flow in their Honda or Acura. It’s great for anyone who wants a quick fix that boosts reliability without any hard work.

Ready to Purchase?

View Price on Amazon (paid link)

10. X AUTOHAUX Male Main Relay Kit 5-Blade for Honda Civic 1992-2001,for Honda CRV 1997-2001, for Acura CL 1997-2003 Main Relay Harness 39400-S10-003, 39400-SR3-003

X AUTOHAUX Male Main Relay Kit 5-Blade for Honda Civic 1992-2001,for Honda CRV 1997-2001, for Acura CL 1997-2003 Main Relay Harness 39400-S10-003, 39400-SR3-003

This main relay kit gives your car steady power and smooth control. It fits many Honda and Acura models with ease.

Each part is made with strong, durable materials for long use. It helps keep your car’s electrical system safe and stable.

It works fast. It stays reliable. It is easy to install.

Pros	Cons
Wide fit for many Honda and Acura models. Strong build for long-lasting use. Easy swap with common 5-blade design. Safe relay action helps protect circuits. Works well with 12V DC systems.	May not fit all trim levels Basic design with no extra features Needs care during install to avoid damage

Perfect For:

This main relay kit is perfect for car owners who need a reliable replacement for their Honda or Acura. It’s easy to install and works with many models from 1990 to 2005.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Honda relay conversion kits fix starting problems and boost fuel efficiency. They’re a must-have upgrade for older Honda and Acura models.

Factors to Consider When Buying:
– Compatibility: Check if the kit fits your car’s make, model, and year. Look for OE part numbers to ensure a perfect match.
– Ease of Installation: Choose plug-and-play kits for quick setup. Avoid kits needing extra tools or modifications.
– Kill Switch Feature: Kits with a kill switch add extra security and control over your vehicle’s power.
– Material Quality: Look for kits made with insulating materials and high-quality copper cores for durability and reliability.
– Performance: Ensure the kit provides stable connections and reliable performance to keep your car running smoothly.
– Price and Value: Compare prices and features to find the best value for your budget.
– Customer Reviews: Read reviews to gauge user satisfaction and real-world performance.

With these factors in mind, you’ll find the perfect Honda relay conversion kit for your car. Enjoy a smoother, safer ride!