MANDATORY CONNECTIONS
1. Disconnect the battery. Negative terminal
2. Connect the “+” terminal of the control box to a 12V positive (+) power source (i.e. fuse box), using the thin
red wire and fuse taps (if necessary) provided in the kit.
Note: Attach this wire to an ignition controlled source to stop the fan when the vehicle is shut off.
Note: Attach this wire to a non-ignition source to keep the fan running after the vehicle is shut off.
3. Connect the “B” terminal to a high amp 12V positive power source (i.e. battery, alternator) using the thick red
wire and in line fuse holder provided in the kit. (Do not install fuse at this time)
4. Connect the “G” terminal to ground (i.e. chassis, negative side of battery) using the thick black wire provided
in the kit.
5. If you have air conditioning: with 3-way connector provided, pass the A/C clutch positive(+) wire (con-
nected to the A/C compressor) through the connector. Place the green wire provided into the closed end of
the connector. Crimp metal plate. Snap plastic cover into place.Attach green wire to the "C" terminal of the
controlbox.
Air Conditioning Relay activates fan when A/C is turned on
6. Insertprobe in radiatorcorenear upper hose. Installrubbercap over endofprobe.
ADJUSTING THE TEMPERATURE CONTROL
1.Attach the temperature control knob to the control
box.
2. Turn the knob clockwise completely.
3. Idle the vehicle, observe the temperature of the
vehicle. (Use the vehicles gauge)
4. When the temperature of the vehicle reaches
above normal, turn the control knob counter-
clockwise until the fan turns on. From here on the
fan should activate at this temperature setting.
Adjust as necessary according to your vehicle
needs.
OPTIONAL CONNECTIONS
Manual Switch (not included) - Allows manual
operation of the fan.
(This step is based on Flex-a-lite’s manual switch part
#31148, other switches will cause this unit fail.)
1. Connect the “M” terminal to terminal 1 on the
switch.
2.Attach terminal 2 of the switch to a 12V positive
(+) source.
3.Attach terminal 3 of the switch to ground, in order
to illuminate the switch.
Note (optional): To stop the fan from activating
thermostatically, omit the lead to the “+” terminal of
the control box. “B”, “G”, & “M” must remain
connected.
*WARNING: IFNOT USING FLEX-A-LITE'S
ILLUMINATED SWITCH (PN #31148) YOU MUST
DISCONNECT THE SWITCH GROUND.
The Flex-a-lite Limited Warranty
Flex-a-lite Consolidated, 7213-45th St. Ct. E., Fife, WA 98424, Telephone No. 253-922-2700, warrants to the original purchasing user, that all Flex-a-lite products to be free of
defects in material and workmanship for a period of 365 days (1 year) from date of purchase. Flex-a-lite products failing within 365 days (1 year) from date of purchase may
be returned to the factory through the point of purchase, transportation charges prepaid. If, on inspection, cause of failure is determined to be defective material or workmanship
and not by misuse, accidental or improper installation, Flex-a-lite will replace the fan free of charge, transportation prepaid. Flex-a-lite will not be liable for incidental,
progressive or consequential damages. Some states do not allow the exclusion or limitaion of incidental or consequential damages, so the above limitation or exclusion may
not apply to you. This warranty gives you specific legal rights and you may have other rights, which vary from state to state. The Flex-a-lite warranty is in compliance with
the Magnuson-Moss Warranty Act of 1975.
rev. 06-21-05 part no. 99970 Page 2
B
CMG+
Ground
12 Volt Positive Source
12 Volt Positive Source
ControlBox
Fuse Holder
Control Box Terminals & Connections
Mandatory Connections
+ 12 volt positive source
G Ground
B 12 volt positive source
C Air conditioning relay
OptionalConnection
M Manual switch
12VoltSource
12 3
Ground
(Illuminateswitch)
A/C positive (+)
wire from clutch
3-way
connector
optional
