Best Relay Test Jumper Kits for Small Repair Shops

Dealing with a faulty relay can stall a repair job in its tracks. You need a tool that lets you test components quickly without piercing wires or juggling jumper leads. That’s where a dedicated relay test jumper kit shines.

This guide breaks down the best kits on the market, from basic jumpers to advanced testers with battery clips. Whether you’re a seasoned tech or just starting your shop, you’ll find the right kit to speed up your diagnostics and get customers back on the road.

Lisle 56810 Relay Test Jumper Kit – Four Essential Jumpers

The Lisle 56810 kit gives you four jumpers that cover the most common relay sizes on domestic and import vehicles. Simply remove the relay, insert the correct jumper, and plug the relay back in. The tabs and flat pads make it easy to attach test leads securely.

You’ll appreciate the blow-molded case that keeps everything organized. Just remember to align the pins correctly when using the green four-pin jumper. This kit is a solid, no-frills choice for everyday relay testing.

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• Set includes four jumpers to fit the most popular size relays on domestic and import vehicles; simply remove relay to be tested, insert correct jumper and insert relay into jumper
• When using green four pin jumper be careful to align pins on jumper and relay correctly
• Jumpers have tabs for clamping and flat pads to place test leads on
• Set comes in blow-molded case for storage
• No need to pierce wires or connect multiple jumper wires

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Lisle 60610 Relay Test Jumper Kit II – Quick Live Circuit Testing

This second-generation kit from Lisle eliminates the need to pierce wires or connect multiple jumper wires. The jumpers feature tabs for clamping and flat pads for test leads, making live circuit testing quick and safe. You can test relays without disturbing the wiring harness.

The blow-molded case keeps all components tidy. It’s an excellent upgrade if you frequently work on live circuits and want to speed up your diagnostic process. A practical addition to any shop’s toolbox.

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• No need to pierce wires or connect multiple jumper wires
• Jumpers have tabs for clamping and flat pads to place test leads on
• Set makes testing relays or live circuits quick and easy
• Set comes in blow-molded case for storage

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RVMARINEPAT Relay Bypass Switch 9038 – Wide Compatibility Tester

The RVMARINEPAT 9038 kit is designed for seamless compatibility with Audi, BMW, Volkswagen, GM, Chrysler, and more. It simplifies fuel pump relay testing by letting you bypass the relay and control the circuit directly. This saves valuable time during electrical diagnostics.

Built from high-quality materials, it meets OEM standards and includes multiple testers in a 6-pack. The plug-and-play design works vertically or horizontally. If you work on European or domestic vehicles, this kit offers broad coverage and reliable performance.

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• Wide Compatibility & Effortless Control: This Relay tester kit is designed for seamless compatibility with a wide range of vehicles, including Audi, BMW, Volkswagen, GM, Chrysler, and more. Our relay bypass kit also replaces multiple relay models (9038, 9036, 9037) and provides direct control over fuel pumps, window motors, headlights, and other components
• Save Time & Diagnose Faster: This diagnostic tester is very convenient. Quickly identify electrical issues and save valuable time during repairs. Simply plug the relay tester into the fuel pump relay position to gain direct control over the circuit and pinpoint problems
• Reliable Performance & Built to Last: Crafted from high-quality materials, this relay tester is rigorously tested to meet or exceed OEM standards. Our relay bypass switch kit enjoy consistent operation with its 20 amp continuous and 30 amp surge current (12V) capacity, ensuring long-lasting performance
• Complete Kit for Versatile Applications: This 6-pack 9038 includes multiple Relay Testers, giving you ample options for a variety of repair needs and making it a valuable addition to any mechanic's tool box
• Component Included: Our product include relay bypass switch kit 9036-1(36-LRG 20AMP), 9036-2(36-MED 20AMP), 9036-3(36-SML 10AMP), 9037-1(37-LRG 20AMP), 9037-2(37-MED 20AMP), 9037-3(37-SML 10AMP)

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Lisle 69300 Master Relay and Fused Circuit Test Kit – Comprehensive Solution

The Lisle 69300 master kit includes eight jumpers to fit the most popular relays, plus a test lead kit for secure multimeter connections. The terminal leads with switch, fuse, and power options let you check current or voltage on many fuses and relays. It even covers configurations not included in the eight jumpers, like VW and BMW.

This is a complete package for a small shop that handles a variety of vehicles. The included test leads and options give you flexibility for complex diagnostics. If you want one kit to cover most scenarios, this is it.

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• Includes 8 Jumpers to fit most popular relays
• Includes Test Lead Kit for easily and securely connecting Relay Test Jumpers to a multimeter
• Terminal Leads with switch, fuse and power options provide easy access to check current or voltage on many fuses and relays used on vehicles today
• Also allows testing of relay configurations not covered by eight Relay Test Jumpers, like Volkswagen, BMW and other European vehicles
• Relay Puller Pliers easily remove electrical relays; weorks without piercing wires

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Sound Troubleshooting Automotive Relay Tester – Automatic Pin Detection

This tester from Sound Troubleshooting automatically detects pin positions, release time, and relay consistency in each test phase. You just clip the alligator clips to the battery—red to positive, black to negative—and the red LED guides you. It works with most general-purpose relays and requires an 11V-15V battery.

The compact design makes it easy to carry around the shop. It’s a fast way to verify relay health without guesswork. If you want a modern, automated approach, this tester delivers clear results quickly.

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• EASY TO USE – The tester will automatically detect the pin position, the release time of the action, and the consistency of the relay in each test phase. If the tester lights up the green LED light, the relay is normal; if the red LED light is on, the relay is abnormal. The relay puller makes it easy to remove the relays to be tested. USA Patented.
• FAST OPERATION – First, clip the alligator clip of the tester to the car battery, the black clip on the negative pole, and the red clip on the positive pole. When the red LED light is on, the tester is ready to start the test. Move the 4 Pin/5 Pin switch to match the number of pins on the relay. Select the appropriate socket according to the relay pins and configuration and insert the relay into the socket. Press the "Test" button, and the tester will automatically begin to operate the relay several times while checking all operations of the relay.
• VERSATILE FITMENT – Suitable for most general-purpose automotive relays on the market. When testing, it needs to be connected to the car's 11V-15V battery. The car battery must be a 12V battery, and the battery voltage must be between 11V-15V; 2. The applicable coil resistance is preferably above 20 ohms. *Not intended for use with all BMW relays*
• COMPACT DESIGN – Our automotive Relay tester is small and easy to carry around for on-the-go jobs or for easy storage. Its compact design allows easy use no matter where you are.
• SIMPLE AND EFFECTIVE – With our patented design this relay tester will give you the results you need quickly and easily. A red light means that the relay is bad, and a green light means the relay is good!

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Lisle 56840 Blue Relay Test Jumper – Single Jumper Convenience

This blue relay test jumper from Lisle is a single unit, perfect if you only need one size. Simply remove the relay, insert the jumper, and plug the relay back in. No wire piercing or multiple jumper wires needed—just clamp your test leads to the tabs or flat pads.

It’s a simple, reliable tool for quick checks. If you already have a set but need a spare or a specific size, this individual jumper is a cost-effective option. Keep it in your drawer for those common relay tests.

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• Simply remove relay to be tested, insert correct jumper and insert relay into jumper
• No need to pierce wires or connect multiple jumper wires. Jumpers have tabs for clamping and flat

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Prismora 9038A Relay Bypass Switch – Amp Loop Monitoring

The Prismora 9038A relay bypass switch lets you control the fuel pump independently of the key-on/off system, simplifying fuel injection testing. It includes an amplification loop for use with a clip-on amp probe or lab oscilloscope to monitor current. This is a powerful feature for diagnosing fuel pump issues.

Plug-and-play installation works vertically or horizontally—just plug it into the fuel pump relay position. It handles up to 20 amps continuous and 30 amps surge, running all 12V DC motors with a flip of a switch. A great tool for advanced diagnostics.

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• Powerful: This relay bypass switch controls the fuel pump independently of the "key on/off" system, Simplifying fuel injection testing
• With Amplification Loop: The 9038A Relay Bypass Switch can be used with a clip-on amplifier probe/lab oscilloscope to monitor current
• Plug and Play: Simple installation, can be installed vertically or horizontally, just plug in the fuel pump relay position to directly control the fuel pump circuit.
• Operating Range: Maximum 20 amps continuous, 30 amps surge (12V), runs all automotive 12V DC motors with the flip of a switch
• Wide Applications: Relay Bypass Switch Kit fits most fuel pumps, cooling fans, window motors, headlight switches, air conditioning compressors and other devices using automotive relays

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Sound Troubleshooting Relay Tester 4 & 5 Pin – Versatile Pin Support

This tester from Sound Troubleshooting supports both 4 and 5 pin relays, automatically detecting pin positions and relay consistency. Clip the alligator clips to the battery—red to positive, black to negative—and the LED guides you through the test. It works with most general-purpose relays on 11V-15V systems.

The compact design is easy to store and carry. It’s a fast, reliable way to test relays without guesswork. If you work with both 4 and 5 pin relays, this tester covers both with ease.

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• EASY TO USE: The tester will automatically detect the pin position, the release time of the action, and the consistency of the relay in each test phase. If the tester lights up the green LED light, the relay is normal; if the red LED light is on, the relay is abnormal. USA Patented
• FAST OPERATION: First, clip the alligator clip of the tester to the car battery, the black clip on the negative pole, and the red clip on the positive pole. When the red LED light is on, the tester is ready to start the test. Move the 4 Pin/5 Pin switch to match the number of pins on the relay. Select the appropriate socket according to the relay pins and configuration and insert the relay into the socket. Press the Test button, and the tester will automatically begin to operate the relay several times while checking all operations of the relay
• VERSATILE FITMENT: Suitable for most general-purpose automotive relays on the market. When testing, it needs to be connected to the car's 11V-15V battery. The car battery must be a 12V battery, and the battery voltage must be between 11V-15V. The applicable coil resistance is preferably above 20 ohms. Not intended for use with all BMW relays
• COMPACT DESIGN: Our automotive Relay tester is small and easy to carry around for on-the-go jobs or for easy storage. Its compact design allows easy use no matter where you are
• SIMPLE AND EFFECTIVE: With our patented design this relay tester will give you the results you need quickly and easily. A red light means that the relay is bad, and a green light means the relay is good
• COMPLETE TESTING KIT: Includes battery clips with alligator connectors for direct connection to your vehicle's 12V battery, making it a comprehensive diagnostic tool for electrical systems troubleshooting
• AUTOMATIC RELAY DETECTION: Features intelligent automatic detection that identifies 4-pin and 5-pin relay configurations, tests relay action timing, and verifies consistency across multiple test cycles for accurate diagnostics

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LIIAMOAR 110 Pcs Circuit Test Lead Kit – Comprehensive Multimeter Accessory

The LIIAMOAR 110-piece kit includes 72 terminals, 8 straight and 8 45° crocodile clips, 2 potentiometers, 2 SRS connectors, and more. It’s designed to diagnose, test, and repair complex automotive circuits. The nickel-plated banana plugs and copper core wires ensure reliable connections.

This kit is perfect for use with any multimeter or oscilloscope, making it a versatile addition to your shop. The black carrying case keeps everything organized. If you need a full set of test leads for various diagnostics, this kit has you covered.

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• 【110Pcs Multimeter Test Lead Kit】This multimeter test lead set is used to diagnose, test and repair complex automotive circuits. Helps you quickly detect car electrical faults without damaging electrical wiring. Professional test lead kits are compatible with a variety of circuit test equipment. Suitable for cars, RVs, trucks, boats and more, and can also be used in laboratories, homes and industries.
• 【What U Get：110-in-1 Multimeter Probe Kit】1 x Black carrying case; 72 x Terminals; 8 x straight and 8 x 45° crocodile clips; 2 x Potentiometer (5KOhm); 2 x SRS Connector; 2 x 1-to-2 Connector; 2 x Alligator Clip; 2 x LED Stroboscope; 2 x Standard Probes; 4 x Acicular Probe; 4 x 1-to-1 Connector; 2 x 1KV CATIII 10A wire piercing probe clip.
• 【High Quality Materials】Standard 4mm nickel-plated banana plug, test leads are copper core flexible wires; nickel-plated copper alligator clips; standard probe and back probe are made of stainless steel.
• 【Wide Application】The multimeter test lead kit is suitable for any electric meter, oscilloscope probe extension, and suitable for most vehicles in Europe, the United States and Japan. Use this kit with measurement tools like multimeters and oscilloscopes to get the most out of it.
• 【Easy to carry】 The car test line kit comes with a portable black storage box, which is equipped with grooved foam to facilitate the classification and storage of all products to avoid loss and can be used for a long time.

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Lisle 56840 Relay Test Jumper, Blue – Professional Grade Single Jumper

This Lisle 56840 blue relay test jumper is designed with the professional in mind. It allows you to remove the relay, insert the jumper, and test without piercing wires or connecting multiple jumpers. The tabs and flat pads make it easy to attach test leads securely.

Lisle is known for high-quality, award-winning products, and this jumper lives up to that reputation. It’s a durable, reliable tool for everyday use. If you need a spare or a specific size, this individual jumper is a solid choice.

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• Leading Manufacturer Of High-Quality Products
• International Renown For Our Diverse Range Of Award-Winning Products
• Fully Equipped With State-Of-The-Art Technology
• All Products Have Been Designed With The Professional In Mind
• Constantly Modernizing Our Powerful Devices To Meet The Demands Of The Modern User

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Buyer’s Guide: What to Consider

Choosing the right relay test jumper kit depends on your shop’s needs. Consider the relay types you handle, your preferred testing method, and the features that will speed up your work.

• Relay Compatibility: Check which relay sizes and pin configurations the kit supports. Kits like the Lisle 69300 cover many, while others focus on specific types.
• Testing Method: Decide between jumpers that require a multimeter or testers with battery clips for automated testing. Jumpers are simpler, while automated testers provide more data.
• Build Quality: Look for durable materials like nickel-plated connectors and sturdy cases. A well-built kit lasts longer and provides reliable connections.
• Portability: Consider how you'll store and carry the kit. Blow-molded cases are great for organization, while compact testers are easy to move around the shop.
• Additional Features: Some kits offer extras like amp loops for oscilloscope monitoring or bypass switches for fuel pump testing. Evaluate if these features match your diagnostic needs.

Conclusion

Relay test jumper kits are essential for quick and accurate electrical diagnostics in any small repair shop. From basic jumpers to advanced testers with battery clips, there’s a tool for every budget and need.

For most shops, the Lisle 69300 Master Kit offers the best all-around coverage. If you want automated testing, the Sound Troubleshooting testers are excellent. Choose based on your specific relay types and diagnostic style.