Best High-Amp Relay Testers for Quick Car Repairs

Looking for the best high-amp relay testers? We’ve got you covered with a list of top 10 testers to simplify your car repairs.

High-amp relay testers are essential tools for anyone working on cars. They help you quickly find electrical problems and save time. With the right tester, you can fix issues faster and avoid guesswork.

These tools are easy to use, reliable, and built to last. They work with many car models and handle high currents safely. You’ll get clear results every time, making repairs simpler.

Ready to upgrade your toolbox? Discover the best high-amp relay testers that make car repairs a breeze. Let’s dive in and find the perfect one for you!

List of Top 10 High-Amp Relay Testers

Title	Best For	Price
RVMARINEPAT Relay Bypass Switch 9038 Relay Tester Kit Diagnostic Tester Scan Tool & Fuel Pump Relay Bypass Master Kit Replaces 9036 9037 Compatible with Domestic GM BMW Audi Chrysler 6-Pack	This relay bypass switch kit is perfect for mechanics and DIY car enthusiasts. It’s easy to use and saves time when fixing electrical issues in cars.	View on Amazon (paid link)
Performance Tool 3009 12-Volt 4- and 5-Pin Automotive Relay Tester	This tool is made for you if you fix cars. It tests relays fast right in your hands.	View on Amazon (paid link)
Teybouk 6 PCS 9038 Relay Bypass Switch, Relay Tester with Amp Loop, Fuel Pump Bypass Kit for 12V DC Motors, Compatible with BMW, Audi, Chrysler (Black)	This Teybouk 6 PCS 9038 Relay Bypass Switch is perfect for car enthusiasts and mechanics who need to test and diagnose 12V DC motors and components in BMW, Audi, and Chrysler vehicles. It’s easy to use and built tough for reliable results.	View on Amazon (paid link)
Weasch 9038A Automotive Relay Bypass Switch Relay Tester Kit 12V 6-Pack	This kit is perfect for car mechanics and car owners who love to fix cars. It helps you test relays easily in many cars.	View on Amazon (paid link)
Lisle 69300 Master Relay and Fused Circuit Test Kit	This Lisle 69300 Master Relay and Fused Circuit Test Kit is perfect for car owners and mechanics who want to test relays and live circuits quickly and easily. It’s great for anyone working on cars, especially those with European models like Volkswagen or BMW.	View on Amazon (paid link)
Super Relay Buddy	Super Relay Buddy is perfect for anyone who needs to test 12 Volt relays with standard SAE wiring. It’s great for mechanics, DIY enthusiasts, or anyone who wants to quickly check relay health.	View on Amazon (paid link)
Relay Buddy 12/24 Volt	This tool is built for mechanics and car owners. It tests 12V and 24V relays fast. You get clear pass or fail lights every time.	View on Amazon (paid link)
Electronic Specialties ESI-194 Super Relay Buddy Relay Tester	The Electronic Specialties ESI-194 Super Relay Buddy Relay Tester is perfect for anyone who needs to quickly and easily check relays. Whether you’re a DIY enthusiast or a professional mechanic, this tool makes testing relays simple and efficient.	View on Amazon (paid link)
VCYOPN 6 PCS 9038A Relay Bypass Switch Kit, Fuel Pump Relay Bypass Master Kit Diagnostic Scan Tool with Amp Loop, Relays Tester Replaces 9036A & 9037A Compatible with Select Models	This VCYOPN 6 PCS 9038A Relay Bypass Switch Kit is perfect for car owners and mechanics who want to diagnose and fix electrical issues in their vehicles. It’s easy to use and works with most 12V cars, making it a handy tool for anyone needing to test fuel pumps, fans, or other parts.	View on Amazon (paid link)
9038A Pack of 24 Relay Bypass Switch Kit and Diagnostic Scan Switch Kit with Amp Loop	This relay bypass switch kit is perfect for car owners and mechanics who need a simple, reliable tool for testing and fixing car parts like fuel pumps, fans, and windows.	View on Amazon (paid link)

Detailed Reviews

You can find the best relay testers right here. We test every tool to bring you the top choices. You will save time and fix cars fast. Read on to discover your match.

1. RVMARINEPAT Relay Bypass Switch 9038 Relay Tester Kit Diagnostic Tester Scan Tool & Fuel Pump Relay Bypass Master Kit Replaces 9036 9037 Compatible with Domestic GM BMW Audi Chrysler 6-Pack

RVMARINEPAT Relay Bypass Switch 9038 Relay Tester Kit Diagnostic Tester Scan Tool & Fuel Pump Relay Bypass Master Kit Replaces 9036 9037 Compatible with Domestic GM BMW Audi Chrysler 6-Pack

The RVMARINEPAT Relay Bypass Switch 9038 is a powerful kit for quick electrical tests. It works on many vehicles like GM, BMW, and Audi. repair work becomes easier with this diagnostic tool.

You can control power to automotive parts directly. This saves time when fixing electrical problems in cars.

Each kit includes multiple relays for different needs. They replace old switches and last a long time.

Pros	Cons
Fits Many Car Brands Find Car Issues Fast Handles Big Power Loads Fixes 9036 And 9037 Gets You Six Switches	Limited to six pieces in the kit. Works only on twelve-volt power systems.

Perfect For:

This relay bypass switch kit is perfect for mechanics and DIY car enthusiasts. It’s easy to use and saves time when fixing electrical issues in cars.

Ready to Purchase?

View Price on Amazon (paid link)

2. Performance Tool 3009 12-Volt 4- and 5-Pin Automotive Relay Tester

The Performance Tool 3009 is a handy relay tester for cars. It checks 4- and 5-pin relays quickly. No need to remove parts from your vehicle.

It has green and red LEDs to show results. Green means pass, and red means fail. It’s easy to read and understand.

This tester is compact and self-contained. It runs on AA batteries, included in the box. Perfect for fast, accurate testing anytime.

Pros	Cons
Quickly test relays outside the vehicle with ease. No battery clamp needed—self-contained and accurate. Clear LED indicators show pass or fail instantly. Compact design, powered by AA batteries for convenience.	Limited to 12-volt relays, not universal. No advanced diagnostics, only basic pass/fail. Battery-dependent, requires replacements for continued use.

Perfect For:

This tool is made for you if you fix cars. It tests relays fast right in your hands.

Ready to Purchase?

View Price on Amazon (paid link)

3. Teybouk 6 PCS 9038 Relay Bypass Switch, Relay Tester with Amp Loop, Fuel Pump Bypass Kit for 12V DC Motors, Compatible with BMW, Audi, Chrysler (Black)

The Teybouk 6 PCS 9038 Relay Bypass Switch is a must-have tool for car diagnostics. It lets you control circuits like the fuel pump directly, independent of the ignition.

This kit includes an amp loop for current monitoring. It’s plug-and-play, so no tools are needed. Works with BMW, Audi, and Chrysler models.

Built tough, it handles 20 amps continuous and 30 amps surge. Perfect for testing motors and temporary bypasses. Simple, reliable, and versatile.

Pros	Cons
Directly control circuits like fuel pumps with ease. Monitor current draw using amp loop for precise diagnostics. Handles 20A continuous, 30A surge for reliable testing. Plug-and-play installation, no tools needed for quick setup.	Switch has 20 amp limit Fits only specific relay type Can break car warranty

Perfect For:

This Teybouk 6 PCS 9038 Relay Bypass Switch is perfect for car enthusiasts and mechanics who need to test and diagnose 12V DC motors and components in BMW, Audi, and Chrysler vehicles. It’s easy to use and built tough for reliable results.

Ready to Purchase?

View Price on Amazon (paid link)

4. Weasch 9038A Automotive Relay Bypass Switch Relay Tester Kit 12V 6-Pack

The Weasch 9038A Automotive Relay Bypass Switch Relay Tester Kit is a 6-pack designed for easy and fast relay testing. It works with many car models, including Domestic, Japanese, Korean, and German vehicles. This kit includes different sizes to fit various repair needs.

This kit is built to last and can handle strong electrical currents. It’s safe for 12V systems and can support up to 20 Amps of continuous current.

The Weasch 9038A is a complete kit for any mechanic’s toolbox. It helps save time and makes repairs easier. This kit is made with high-quality materials for reliable performance.

Pros	Cons
Broad vehicle compatibility for easy repairs on any car. Save time & diagnose faster with direct control over circuits. Premium construction for long-lasting use in tough conditions. Reliable current handling for safe and secure relay testing. Complete kit with multiple options for versatile repairs.	No instructions included, might confuse first-time users. Limited to 12V systems, not suitable for higher voltage vehicles. OEM verification required, adds extra step before purchasing.

Perfect For:

This kit is perfect for car mechanics and car owners who love to fix cars. It helps you test relays easily in many cars.

Ready to Purchase?

View Price on Amazon (paid link)

5. Lisle 69300 Master Relay and Fused Circuit Test Kit

The Lisle 69300 Master Relay and Fused Circuit Test Kit makes testing relays and live circuits fast and easy. It works without piercing wires, saving time and effort. This kit is a must-have for automotive testing.

It includes eight relay test jumpers and a relay puller pliers. These tools help you remove relays safely and test more configurations.

With easy multimeter connections, you can check current or voltage quickly. The kit also works with European vehicles like Volkswagen and BMW. It’s simple, reliable, and efficient.

Pros	Cons
Quickly test relays and live circuits without wire damage. Includes 8 relay jumpers for most automotive relays. Easy multimeter connections for current and voltage checks. Test European relays like VW and BMW with ease. Relay puller pliers for damage-free relay removal.	Limited relay types supported Bulky case uses space No built‑in fuse tester

Perfect For:

This Lisle 69300 Master Relay and Fused Circuit Test Kit is perfect for car owners and mechanics who want to test relays and live circuits quickly and easily. It’s great for anyone working on cars, especially those with European models like Volkswagen or BMW.

Ready to Purchase?

View Price on Amazon (paid link)

6. Super Relay Buddy

Stop guessing if your car relay is bad. The Super Relay Buddy finds hidden faults fast.

It runs a full test on seven types. The tool checks seven amps with ease. Just plug it in and see the truth.

Pros	Cons
Improved test finds bad relays fast Full 7+ amp load catches failing relays Covers 7 relay types with one tester Automated 10‑cycle test checks relay health Clear guide shows compatible relays	Limited to standard SAE wiring. Cannot test special BMW relays. Must verify relay shape first.

Perfect For:

Super Relay Buddy is perfect for anyone who needs to test 12 Volt relays with standard SAE wiring. It’s great for mechanics, DIY enthusiasts, or anyone who wants to quickly check relay health.

Ready to Purchase?

View Price on Amazon (paid link)

7. Relay Buddy 12/24 Volt

This tool tests both 12V and 24V relays easily. It checks the coil & contacts for you. Fix the problem fast with this device.

Use this quick off-the-car tester on the go. You see the green light for a good result.

Bad relays show a red light and flash a code. Find the true cause in seconds.

Pros	Cons
Tests Both 12V And 24V Relays Checks Contacts And Coils With One Tool See Faults Fast Right On The Car Quick Show Of Relay Pass Or Fail Red Light Means Bad, Green Is Good	Battery not included, so you need to buy one separately. Only tests 12V/24V, not other voltage relays. No instructions, might be tricky for beginners.

Perfect For:

This tool is built for mechanics and car owners. It tests 12V and 24V relays fast. You get clear pass or fail lights every time.

Ready to Purchase?

View Price on Amazon (paid link)

8. Electronic Specialties ESI-194 Super Relay Buddy Relay Tester

Do bad relays stop your work? The Super Relay Buddy finds them fast. It improves the test for better results.

It runs a full 7 amp load test. This catches weak links effectively. The system flags bad parts with ease.

Try the automatic 10 cycle test now. See the clear results. It saves time for you.

Pros	Cons
Turbocharge your car checks with the Super Relay Buddy Finds bad relays fast and accurately Tests with a full 7+ amp load Does a flexible 10 cycle test The fastest way to test relays	Limited to 12‑volt relays only No built‑in display for results Price higher than basic testers

Perfect For:

The Electronic Specialties ESI-194 Super Relay Buddy Relay Tester is perfect for anyone who needs to quickly and easily check relays. Whether you’re a DIY enthusiast or a professional mechanic, this tool makes testing relays simple and efficient.

Ready to Purchase?

View Price on Amazon (paid link)

9. VCYOPN 6 PCS 9038A Relay Bypass Switch Kit, Fuel Pump Relay Bypass Master Kit Diagnostic Scan Tool with Amp Loop, Relays Tester Replaces 9036A & 9037A Compatible with Select Models

VCYOPN 6 PCS 9038A Relay Bypass Switch Kit, Fuel Pump Relay Bypass Master Kit Diagnostic Scan Tool with Amp Loop, Relays Tester Replaces 9036A & 9037A Compatible with Select Models

The VCYOPN 6 PCS 9038A Relay Bypass Switch Kit is a powerful diagnostic tool. It helps you test and control key car parts. This kit is easy to use and built to last.

It features an ampere-loop function to monitor current. The plug-and-play design makes setup quick. Its nylon housing resists impact and wear.

This kit works with most 12V vehicles. It can handle up to 30 amps of surge current. Use it to test fuel pumps, fans, and more.

Pros	Cons
Monitors fuel pump current for precise vehicle diagnostics. Durable nylon housing resists impact and daily wear. Plug-and-play design for easy, intuitive installation. Supports 30A surge current, ideal for 12V systems. Controls key components like fuel pump and cooling fan.	No built‑in fuse for overload protection Only fits 12V systems Relay slots may feel loose over time

Perfect For:

This VCYOPN 6 PCS 9038A Relay Bypass Switch Kit is perfect for car owners and mechanics who want to diagnose and fix electrical issues in their vehicles. It’s easy to use and works with most 12V cars, making it a handy tool for anyone needing to test fuel pumps, fans, or other parts.

Ready to Purchase?

View Price on Amazon (paid link)

10. 9038A Pack of 24 Relay Bypass Switch Kit and Diagnostic Scan Switch Kit with Amp Loop

Stop guessing under the hood. Fix car problems fast. Test parts with ease.

Bypass bad relays now. Find hidden issues today.

Pros	Cons
Works with many car parts, saving time and hassle. Replaces old parts easily for quick fixes. Tests and checks power without starting the car. Handles high power, fits most vehicles. Easy to install, plugs in fast anywhere.	No instructions included, may confuse first-time users. Limited to 12V systems, not for 24V vehicles. Not for heavy-duty use, max 30 amps surge.

Perfect For:

This relay bypass switch kit is perfect for car owners and mechanics who need a simple, reliable tool for testing and fixing car parts like fuel pumps, fans, and windows.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

High-amp relay testers are essential tools for car repairs. They help you find electrical problems fast and save time. With the right tester, you can fix issues quickly and avoid guesswork.

Buying a high-amp relay tester is easy when you know what to look for. Here’s a simple guide to help you choose the best one for your needs.

Compatibility:
Make sure the tester works with your car model. Some testers are for specific brands like BMW or Audi, while others work with many vehicles.
Ease of Use:
Look for a tester that’s simple to use. Plug-and-play designs and clear results make repairs easier.
Current Handling:
Check if the tester can handle high currents safely. It should work with 12V systems and manage 20-30 amps without issues.
Durability:
Choose a tester that’s built to last. Tough materials like nylon housing resist wear and impact.
Features:
Extra features like amp loops or LED indicators can make testing more accurate. Look for tools with multiple functions.
Price and Value:
Compare prices and what’s included. A kit with multiple relays or tools might offer better value.
Portability:
A compact and lightweight tester is easy to carry. It’s perfect for on-the-go repairs.

With these factors in mind, you’ll find the perfect high-amp relay tester for your toolbox. Happy repairing!