Best Automotive Replacement Switches Relays Deals of Nov 2026

Updated November 9, 2026Our site contains affiliate links for which we may be compensated.
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9038 Relay Bypass Switch Kit, 6-Pack, Black | Replacement 9037 9036, Fit for Domestic GM BMW, Audi, Chrysler

Compatibility: 9038 replaces 9036 9037, suitable for most domestic, Japanese, Korean and German fuel pumps, window motors, headlight switches and other devices using automotive relays
Plug and Play: It can be installed vertically or horizontally, just plug in the fuel pump relay position to directly control the fuel pump circuit, very convenient, saving a lot of time and money
Newly Upgraded: The casing is made of high-quality flame-retardant material, ensuring stable performance even in extreme environments, and is dustproof and waterproof; the silver contacts have high conductivity, ensuring continuous and stable power supply operation.
Operating Range: Up to 20 amps continuous current, 30 amps surge current (12V), suitable for most car models on the market, please see the picture for specific models.
Products Include: 6* relay switches. Please check the OEM part number before purchasing and make sure your part number matches this part number to avoid purchasing the wrong product
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4 PCS Relays, 5 Pin Relay, 40A Waterproof Car Relays, 12V Relay Switch | Starter Relay for Electric Cooling Fans, Motor Starters, Automotive Taillights

Quality Material: The a/c relay housing is made of PA66 flame-retardant material with pure copper enameled wires to ensure excellent heat dissipation and magnetism, which enhances resistance to high temperatures and arc erosion, providing excellent conductivity and long-term reliability
Excellent Waterproof Performance: The fuel pump relay base is sealed and waterproof with IP67 protection level, waterproof and dustproof, able to work stably in all kinds of humid environments, ensuring long-term reliability and durability of the relay
Relay Specifications: Package contains four starter relays, each model number JD1914-12V-40A, five-pin design, size 1.07 x 0.98 inches, coil power 1.8 watts, coil resistance 90Ω
Easy Installation: The five-pin design of the radiator fan relay makes it easy to replace an existing relay by simply connecting the appropriate wires to the corresponding pins. No additional tools are required, making the installation process easy and quick to accomplish in tight spaces
Wide Application: The relays are widely used in a variety of electric vehicles such as automobiles, motorboats, etc. The relay box can be a nice replacement for 582195, 582472, 582473, 584416, 586147 and 586224. They can also be used in a variety of application scenarios such as automotive taillights, electric cooling fans, electric water pumps, motor starters and motorcycle conversions
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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

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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Weasch 9038A Automotive Relay Bypass Switch Relay Tester Kit 12V 6-Pack | Fuel Pump Relay Bypass Master Kit Replaces 9036A 9037A Compatible with Domestic, Japanese, Korean, and German

【Broad Vehicle Compatibility】This 9038A Relay tester kit designed for seamless Compatible with most Domestic, Japanese, Korean, and German vehicles. Provides direct control over fuel pumps, window motors, headlights, and other automotive relay-driven components
【Save Time & Diagnose Faster】Bypasses standard switches to directly control the circuit. Simply plug this diagnostic tester into the fuel pump relay position to quickly identify electrical issues and save valuable time during repairs
【Premium Construction】Built to last and withstand rigorous use. Crafted with a high-quality PA66 flame-retardant shell, ensuring consistent operation in demanding workshop environments
【Reliable Current Handling】Rigorously tested for safe operation in 12V systems. This bypass kit reliably supports up to 20 Amps of continuous current and 30 Amps of surge current, guaranteeing secure relay testing without overloading the circuit
【Complete Kit for Versatile Repairs】This 6-pack relay tester kit gives you ample options for a variety of repair needs, making it a valuable addition to any mechanic's toolbox. (Component Included: Our product include relay bypass switch kit 36-LRG/20AMP, 36-MED/20AMP, 36-SML/10AMP, 37-LRG/20AMP, 37-MED/20AMP, 37-SML/10AMP). Please verify your OEM part numbers before purchasing
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Nilight

30 Day Low Price

Nilight 5 Pack Fused 4Pin Relay with Socket 30A Switch Harness Kit SPST | 12V Interlocking 30 Amp Automotive Replacement Relays with Fuse for Auto Cars RV Truck SUV Automotive

Upgraded Version - Automotive relays built in fuse socket included 30A blade fuse with heavy duty 14AWG wires for main contact. no need of a separate fuse holder, saving space and money. 4-Pin SPST (Single Pole Single Throw) Relay.
Mounting Design Feature - The interlocking mounting design of unique male and female slot on each socket edge, connect relays together and manage cables easily, offering clean and neat installation.
Easy Wiring - The relay sockets come with color-labeled wires for load/accessories convenient wiring. Black - Ground (85), Red - VDC (30), White - Trigger (86), Blue - Output N/O (87)
Wide Application - Widely used in car keys power control, over-load protection, trunk release, polarity change, power door lock/actuator control, change a low current output to high current, add ignition/accessory outputs, control motors/other electronics etc.
Set includes 5 relays, 5 relay harnesses, and 5 30A blade fuses.
Details & specs
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3 PCS 4 Pin 12V Relay Socket, 30A Fuse Relay Switch Harness Set | SPST Automotive Relay, Heavy Duty 14 AWG Wires, Electrical Relays Replacement for Truck Boat Van Motorcycle, Car Accessories

With Extra Fuse: With a built-in 30A blade fuse and heavy-duty wire for the main contact, this car relay 12v needs no separate fuse holder, saving space and cost. When the circuit is overcurrent, the fuse will quickly blow to cut off the circuit, providing additional protection for automotive circuits and ensuring driving safety
Easy Wiring: For quick and easy connection to loads or accessories, this 4 pin relay features color-coded wires for easy installation and circuit connection. The specific color-coding is: black to ground (85), blue to connect to power positive (30), white to contact hair (86), and red to output normally open (87)
Interlocking Design: To achieve a neat and orderly installation layout with easy cable management and organization, the unique interlocking design of the male and female slots on the edge of each 12v relay socket makes it easy to connect multiple relays together for a clean and tidy relay installation
Solid Construction: Supporting 12V DC (up to 14V DC) and 30A current, this SPST (Single Pole Single Throw) automotive relay features a ruggedized case that is resistant to bumps and high temperatures for smooth, reliable operation and high switching capacity, with a 4-pin design and metal mounting bracket for easy installation
Diverse Applications: For automotive key power control, overload protection, trunk release, power door lock/actuator control, security system and more, this 12v relay with harness is widely used. It can also be used to control lights, fog lights, starter, fan, speakers and other electronic equipment
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Disclaimer: While we make every effort to ensure accuracy, we cannot guarantee that all product specifications, pricing, discounts, and details are complete or error-free. Because information is subject to change, we recommend verifying all details directly with the retailer prior to making a purchase. As an Amazon Associate, we earn from qualifying purchases.

9 Automotive Replacement Switches Relays deals are available from: Amazon, starting from $7.59.

The biggest discount we found is 10% on Nilight 5 Pack Fused 4Pin Relay with Socket 30A Switch Harness Kit SPST | 12V Interlocking 30 Amp Automotive Replacement Relays with Fuse for Auto Cars RV Truck SUV Automotive (50023R) at Amazon.

The lowest price we found is $7.59 while the highest is $25.99. Prices for the best Automotive Replacement Switches Relays deals average at $13.40.