Fitment: The dual cooling fan relay kit fits all , 12inch, 14inch and 16inch cooling fans.Installation: With wiring diagram, the red to 12V DC positive battery terminal, coffee for fan positive, black to ignition, grey to sending unit per wiring diagram.Dual Fan Relay Kit: It turns on your cooling fan when the engine reaches the temperature of the thermostat switch mounted on the engine head or when the air conditioner is turned on. 185 degrees on, 175 degrees off, Voltage: 12V DCPackage: Including 1 Wiring Diagram, 2 40A Relay with harne, 1 Temperature Switch (185 On 175 Off), 1 3/8inch Thread Probe, 1 3/8 " to 1/2" Adapter, 2 Inline Fuse Holders, 2 20Amp Fuses, 8 Terminals, 4 Fan Tail Connectors.Note: If you want to install a high gauge fan, you can solder larger wires to it. 14AWG wire (15 amps) is not enough for high current draw, e.g. 12-20A, 10-30A, 8-40A. Specification: Product size: 16cmx15cmx6cm/6.30inchx5.91inchx2.36inchMaterial: metal Package Includes: 1 Wiring Diagram2 40A Relay with harne1 Temperature Switch (185 On 175 Off)1 3/8inch Thread Probe1 3/8 " to 1/2" Adapter2 Inline Fuse Holders2 20Amp Fuses8 Terminals4 Fan Tail Connector Note: Please allow slightly errors due to manual measurement and different monitors.