The Best Automotive Performance Electrical System Relays of 2023

Ideal for use with high amperage single fans or with standard dual cooling fan applications

Protects the electrical system from voltage and amperage spikes and prevents the fan from feeding voltage back through the vehicles' wiring system

Kit includes: SPST 70-amp heavy duty relay, relay base with harness (6' input, 2' output), 70-amp maxi fuse with mounting base and cover, crimp on terminals & mounting hardware

Fit Type: Universal Fit

Dual activation cooling fan relay will turn your cooling fans on when the engine reaches the preset temperature of the thermostatic switch mounted in the engine head or when the A/C is turned on

Ideal for installing air conditioning in your project car

Features simple to use Posi-taps for the ignition and A/C compressor connections

Kit includes: Three 40-amp relays with mounting bases & wiring, fuse holder & 70-amp fuse, two LT1/LS1 fan connectors, thermostatic switch, adapter and insulated terminals

Thermostatic switch turns on at 195 degrees and off at 185 degrees; Thread size: 3/8"-18NPT; 1/2" NPT to 3/8" NPT adapter provided

Provides constant voltage, protects from voltage and amperage spikes and prevents the fan from back feeding voltage through the vehicle's wire harness

Threaded thermostatic switch that screws into the engine block or intake manifold for a professional looking installation

Inexpensive protection for an electric fan and a vehicle's wire harness

Kit includes weatherproof: SPST 35-amp relay, 30-amp circuit breaker and relay base with harness (6' input/2' output); thermostatic switch, adapter, heat-shrinkable crimp-on terminals and mounting hardware

Thermostatic switch turns on at 185 degrees and off at 175 degrees; Thread size: 3/8"-18NPT; 1/2" NPT to 3/8" NPT adapter provided

12 AWG tinned copper wires for Pin 30, Pin 87, Pin 87a. Length: 5.1in

16 AWG tinned copper wires for Pin 85, Pin 86. Length: 5.1in

12v dc waterproof 5 wire relay (max 14v). 40 amp / 30 amp High switching capability

Excellent waterproof and dustproof ability, high quality in any weather conditions

Nominal Coil Voltage: 12 V DC; Coil Power: 1.8 W; Coil Resistance: 80 Ω; Must Operate Voltage: 6~8 V DC; Must Release Voltage: 0.6~3.6 V DC; Maximum Applied Voltage: 15.6 V DC

High switching capability: Normally open 40A/14V DC and normally close 30A/14V DC. Suitable for Nilight LED light bar wiring harness kit

Premium quality: Durable relay and harness socket with 5 wires; Made by high-grade materials to ensure superior quality and long lifespan

Male-female slot design: Unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installation

Easy wiring: The relay sockets come with different colors for loads/accessories, simple and convenient wiring

Package include: 5 x relay and 5 x relay socket with wires.Fit type: Universal fit

Self-Stripping electrical tap connectors - Nilight self-stripping electrical t-tap connectors makes tapping into an existing wire a quick and easy job

Versatile kit - 60 piece T-Tap Wire Connectors plus 60 piece; Male Quick Disconnects will last for numerous wiring projects. Marine, automotive, scientific, home wiring projects - you name it

Thick tinned copper contacts - Thicker tinned copper contacts provide maximum conductivity and prevents the wire from shorting out efficiently

Quality t-tap connector housing - Quick splice T-Tap connectors will securely lock on the wire. Plastic housing will not open after it has been snapped on the wire

Perfectly fitting male quick disconnects - Nylon male disconnects have been designed to lock tightly on the T-Tap connectors to prevent sliding out

Motorbooks International

Upgraded Version - Automotive relays built in fuse socket included 30A blade fuses with heavy duty 14AWG wires for main contact. No need of a separate fuse holder, saving space and money. Bosch style 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.

Package includes: 5 relays, 5 relay harnesses, and 5x30A blade fuses.

Inexpensive protection for an electric fan and a vehicle's wire harness

Provides constant voltage, protects from voltage and amperage spikes and prevents the fan from back feeding voltage

Threaded thermostatic switch (185°F On/175°F Off) screws into the engine block or intake manifold; Switch thread size 3/8"-18NPT (1/2" to 3/8" NPT adapter provided)

Protected by 40-amp relay and 30-amp circuit breaker

Rated at maximum 25 amp continuous draw per each relay (50 amp total)

Fuses not included

AC override circuit included for each relay