Flex-a-Lite 684 - without controls Black Magic TOYOTA 4x4 (1984-1996 4 & 6 cyl.) - Manual (Page 2)

Rev. 02-09-10 99674 Page 2 of 3
1. Disconnect the battery Negative (-) terminal
2. Connect the “B” terminal on the control to the 12 volt positive (+) battery terminal using the thick red wire
and fuse holder provided in the kit.
3. Connect the “G” terminal on the control to battery negative (ground - ) terminal using the thick black wire
provided in the kit. (Do not install fuse at this time)
4. Connect the “+” terminal of the control box to a keyed 12 volt 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.
Attach this wire to a constant source to keep the fan running after the vehicle is shut off.
5. If you have air conditioning: With the 3-way connector provided, pass the A/C clutch positive(+) wire
(connected 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 control box. Air Conditioning Relay activates fan when A/C is turned on
6. Insert temp. probe through radiator core near the upper (inlet) hose. Install rubber cap over end of probe.
WIRING INSTRUCTIONS; #674 with controls only
*WARNING: If not using
Flex-a-lite's optional
illuminated switch (PN
#31148), you must
disconnect the switch
ground.
WIRING DIAGRAM - MODEL 674
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 slightly 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 to
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: To stop the fan from activating thermostatically, omit the lead to the “+” terminal of the control box. “B”,
“G”, & “M” must remain connected.