Wiring Harness
Installation
Instructions
Dual Electric Fan Wiring Kit
Dual Electric Fan Wiring Harness with Temperature Sending Unit and 40 Amp Waterproof Relays
Be Cool Part Numbers:
#75100 - Temperature Sending Unit Turns Fans on at 210˚, off at 190˚
#75117 - Temperature Sending Unit Turns Fans on at 195˚, off at 175˚
#75104 - Temperature Sending Unit Turns Fans on at 185˚, off at 165˚
Kit Contents for #75100, #75117, or #75104:
• 2 Harnesses with Relays, Sockets, and Fuse Holders
• #75099 Temperature Sending Unit (for kit #75100)
• #75030 Temperature Sending Unit (for kit #75117)
• #75029 Temperature Sending Unit (for kit #75104)
• Butt and Eyelet Connectors
• Shrink Tubing
See page 5 for installation instructions, pages 6 & 7 for wiring diagrams for
See page 5 for installation instructions and pages 6 & 7 for wiring diagrams for
vehicles without air conditioning, and pages 8 & 9 for vehicles with air conditioning.
vehicles without air conditioning and pages 8 & 9 for vehicles with air conditioning.
Page 2
Kit Contents
Single Electric Fan Wiring Kit
Single Electric Fan Wiring Harness with Temperature Sending Unit and 40 Amp Waterproof Relay
Be Cool Part Numbers:
#75098 - Temperature Sending Unit Turns Fan on at 210˚, off at 190˚
#75021 - Temperature Sending Unit Turns Fan on at 195˚, off at 175˚
#75032 - Temperature Sending Unit Turns Fan on at 185˚, off at 165˚
#75017 - Wiring Kit with no Temperature Sending Unit
Kit Contents for #75017, #75021, #75032, or #75098:
• Harness with Relay, Socket, and Fuse Holder • #75029 Temperature Sending Unit (for kit #75032)
• #75030 Temperature Sending Unit (for kit #75021) • #75099 Temperature Sending Unit (for kit #75098)
• Butt and Eyelet Connectors • Shrink Tubing
See page 5 for installation instructions and pages 6 & 7 for wiring diagrams for
See page 5 for installation instructions, pages 6 & 7 for wiring diagrams for
vehicles without air conditioning and pages 8 & 9 for vehicles with air conditioning.
vehicles without air conditioning, and pages 8 & 9 for vehicles with air conditioning.
Page 3
Overview
Dual & Single Electric Fan Wiring Kits
Design Intent:
• These wiring harness kits are designed to enable a simple and dependable installation for high performance electric
fan(s).
• They are compatible with all vehicles and can be used on any positive or negative ground 12 volt DC vehicle with no
modications.
• The wiring harness is protected by many weatherproof components. However, care should be taken to position the devices where they will be as dry as possible and the least exposed to extreme temperatures.
Installation of the Temperature Sending Unit:
• DO NOT attempt installation when the engine is hot.
• The temperature sending unit is designed to mount in the intake manifold for the most accurate control of the system.
• The switch has 3/8”-18 N.P.T threads and will work in many applications. A 1/2” N.P.T. adapter is included in the kit if larger
threads are needed for this switch installation.
• DO NOT use “Teon” style tape on the temperature sending unit as this could cause a poor electrical ground and improper
operation.
• If you need to cut and splice the wires, use the provided butt connectors and shrink tubing for a proper connection.
See page 5 for installation instructions and pages 6 & 7 for wiring diagrams for
See page 5 for installation instructions, pages 6 & 7 for wiring diagrams for
vehicles without air conditioning and pages 8 & 9 for vehicles with air conditioning.
vehicles without air conditioning, and pages 8 & 9 for vehicles with air conditioning.
Page 4
Installation Instructions
Dual & Single Elecric Fan Wiring Kits
DISCONNECT BATTERY before any mechanical or electrical installation.
Mount the relay in a dry position on the vehicle. When this is completed, connect the wires as per the diagram.
Red Wire:
Gray Wire: Connect the gray wire from the relay to the temperature sending unit using the enclosed eyelet connector.
Orange Wire/Fuse: Connect the eyelet end on the fuse holder assembly to the positive battery terminal.
Green Wire: Connect the green wire from the relay to the ignition terminal in fuse box.
For air conditioned vehicles, use Be Cool Kit #75095. When air conditioning is activated, fans will turn on regardless of engine
temperature.
Wiring Instructions for Optional A/C Wiring Harness Kit Be Cool Part #75095
Blue Wire: Connect the blue wire to the blue wire on the A/C compressor power input with butt connector.
Gray Wire: Connect the gray wire from the relay to the temperature sending unit using the enclosed eyelet connector.
Black Wire: Connect the black wire to the eyelet connector, and then to the chassis ground.
Op ti on al ---------->
Plug the red and black wires (with white plastic plug) from the relay to the white plastic plug on the fan harness.
Connect a high amp toggle switch (Be Cool Kit #75096) to the temperature sending unit’s gray wire. This will
close the circuit when the switch (SPST; Single Pole, Single Throw) is on.
Page 5
Page 4
Dual Fan
Fuse
Box
Page 4
Design Intent:
• These optional high amp toggle switch harness kits are designed to enable simple installation of high performance elec-
tric fan(s).
• It is a universal t. It can be used on any positive or negative ground 12 volt DC vehicle.
• These switches can be used with or without a temperature sending unit using the diagram on pages 17 & 18.
• The wiring harness is protected by many weatherproof components. However, care should be taken to position the de-
vice where it will be as dry as possible and the least exposed to extreme temperatures.
Theory of Operation:
• When the temperature sending unit reaches its operating temperature it brings the attached wire to ground.
• When this happens the relay is “turned on” which, in turn, operates the electric fan(s).
• These manual high amp toggle switches serve as a bypass to the temperature sending unit and will operate the fans at
your desired temperature.
Installation of the High Amp Toggle Switches:
• DO NOT attempt installation when the engine is hot.
• Disconnect the battery before installing wiring.
• If you need to cut and splice the wires, use the provided butt connectors and shrink tubing for a proper connection.
See page 16 for installation instructions and pages 17 & 18 for a wiring diagram.
Page 4
Design Intent:
• These optional high amp toggle switch harness kits are designed to enable simple installation of high performance elec-
tric fan(s).
• It is a universal t. It can be used on any positive or negative ground 12 volt DC vehicle.
• These switches can be used with or without a temperature sending unit using the diagram on pages 17 & 18.
• The wiring harness is protected by many weatherproof components. However, care should be taken to position the de-
vice where it will be as dry as possible and the least exposed to extreme temperatures.
Theory of Operation:
• When the temperature sending unit reaches its operating temperature it brings the attached wire to ground.
• When this happens the relay is “turned on” which, in turn, operates the electric fan(s).
• These manual high amp toggle switches serve as a bypass to the temperature sending unit and will operate the fans at
your desired temperature.
Installation of the High Amp Toggle Switches:
• DO NOT attempt installation when the engine is hot.
• Disconnect the battery before installing wiring.
• If you need to cut and splice the wires, use the provided butt connectors and shrink tubing for a proper connection.
See page 16 for installation instructions and pages 17 & 18 for a wiring diagram.
Dual Fan
Wiring
Diagram
For Vehicles
WITHOUT
Air Conditioning
Wiring Diagram
for Be Cool Kit
Part Numbers:
#75100 w/Sending Unit
#75117 w/Sending Unit
#75104 w/Sending Unit
Fuse
Box
Wiring
Diagram
For Vehicles
WITHOUT
Air Conditioning
Wiring Diagram
for Be Cool Kit
Part Numbers:
#75100 w/Sending Unit
#75117 w/Sending Unit
#75104 w/Sending Unit
Fuse
Box
Page 6
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