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Upgrade your vehicle\'s electric cooling fan control with this heavy-duty universal 12V electric fan wiring harness kit. Designed for single and dual electric fan setups, the kit includes a waterproof 40A relay, thermostatic temperature switch, fuse protection, wiring harness, and installation connectors.
Ideal for muscle cars, hot rods, 4x4s, and other automotive cooling fan applications, this kit helps automatically switch your electric cooling fan on and off based on engine temperature.
Thermostatic Fan ControlThe included thermostatic switch automatically activates the cooling fan when the preset temperature is reached and turns it off as the engine cools.
Switch Size: 3/8\" NPT
Convertible to: 1/2\" NPT with included lid
Fan ON Temperature: 185°F
Fan OFF Temperature: 165°F
Optional: Switched manual override capability
The waterproof 40 Amp relay helps handle the electrical load required to start and operate an electric cooling fan. The relay helps reduce the current load through the control circuit while providing dependable fan switching.
An overload circuit breaker and inline blade fuse protection are also included to help protect the wiring and electrical system.
Wiring Harness & ConnectorsThe kit includes a pre-wired relay harness with approximately 350 cm of main wire and 200 cm of thin wire, providing ample length for many vehicle installations.
An assortment of wiring connectors is included to help simplify installation and connection to the electric fan system.
Compatible Fan ConfigurationsThis universal electric fan wiring kit can be used with:
2 × 8\" electric fans
2 × 10\" electric fans
2 × 12\" electric fans
2 × 14\" electric fans
Single 8\" electric fan
Single 10\" electric fan
Single 12\" electric fan
Single 14\" electric fan
Single 16\" electric fan
Important: For setups using two 16\" electric fans, 2 relay kits are required.
Product SpecificationsType: Universal Electric Fan Wiring Harness Kit
Voltage: 12V
Relay: Waterproof 40A Relay
Thermostatic Switch: 3/8\" NPT / convertible to 1/2\" NPT
Temperature: 185°F ON / 165°F OFF
Main Wire Length: Approx. 350 cm
Thin Wire Length: Approx. 200 cm
Fuse: Inline Blade Fuse, 30A / 40A
Circuit Protection: Overload Circuit Breaker
Manual Override: Optional switched override capability
Condition: 100% Brand New
Designed to work with compatible OEM wiring and aftermarket electric cooling fans, this harness is a practical solution for adding automatic temperature-controlled fan operation to a variety of vehicles.
It is especially suitable for muscle cars, hot rods, 4x4s, custom builds, and automotive electric cooling fan systems.
Package Includes1 × 12V Electric Fan Wiring Harness Kit
Waterproof 40A Relay
Thermostatic Temperature Switch
Fuse Block / Inline Fuse Protection
Overload Circuit Breaker
Wiring Harness
Assortment of Wiring Connectors
Professional installation is highly recommended. Installation instructions are not included. Please verify your fan configuration, wiring requirements, connector compatibility, and temperature switch specifications before installation.

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