Flex-a-Lite 52181C3 Corvette Radiator & Fan Kits - Manual (Page 4)

Installation instructions continued from previous page
Wiring Diagram
colored
black thick
black
thick black
Locate a mounting point for the control near inlet side of radiator. Control needs to be placed within 18” of 1.
radiator inlet hose. You may want to mount next to radiator on fender well or the corner of the fan shroud.
Mount control using the screws provided.
Using the yellow butt connectors provided, attach a length of the large diameter (10 AWG) 2. red wire to
the colored motor wire. Attach a length of the large diameter (10 AWG) black wire to the black motor
wire. Once the fan is in place, these will attach to the control module.
Tip: Strip an additional 1/8” of
insulation from the motor wires and fold them over to increase the thickness of the wire where it
will slide into the butt connector. If mounting the control module to the fan shroud, the motor wires can
be connected now. If mounting the control somewhere else in the engine compartment, leave enough wire
to reach the control module.
Connect the motor wires to the control module (colored wire to the “M+” terminal and black wire to the “M-” 3.
terminal).
Use the large diameter red (10 AWG) wire to run power directly from the battery positive (+) terminal to
4.
the “B” terminal on the control module. Connect the fuse holder in-line with this wire, as shown, but do not
insert the fuse yet. Use the yellow female spade, ring and butt connectors provided.
Use the large diameter black (10 AWG) wire to run from a clean surface on the engine block or head to the
5.
“G” terminal on the control module. Use the yellow female spade and ring connector provided.
Use the small diameter red wire (14 AWG) to connect the “+” terminal on the control module to a positive
6.
power source. NOTE: Attaching this wire to an ignition-controlled source will shut off the fan when
the engine is turned off. Note: Do Not connect the “+” terminal wire to the ignition switch, ignition
coil, or fuel pump. Attach this wire to an uninterrupted (always hot) power source to allow the fan to
continue running after the engine is shut off. Use the blue female connector and fuse taps (included) if
necessary.
If the vehicle is equipped with air conditioning, a
7. mandatory connection is needed to cycle the fan on and
off with the A/C clutch when the A/C is turned on. Create a connection between the “C” terminal on the
control module and the positive wire that triggers the A/C compressor. Using a voltmeter, determine which
wire coming from the compressor is the positive trigger wire. Use the included 3-way connector and small
diameter green wire (14 AWG) to tap into this wire and send a signal to the “C” terminal on fan control
module.
(Optional) For manual switch operation, use Flex-a-lite p/n 31148. Connect the switch as shown on the
8.
wiring diagram. Connect the “M” terminal on the control module to the “1” terminal on the switch. Connect
the “2” terminal on the switch to a positive 12v power source. Connect terminal “3” on the switch to a good
ground (for switch illumination).
NOTE: To prevent thermostatic activation (if only manual switch
operation is desired), omit the lead to the “+” terminal of the control box. “B”, “G”, “M+” and “M-”
must remain connected. If not using a Flex-a-lite manual switch, do not connect a ground wire to
the switch!
Rev. 07-30-12 99181 Page 4 of 6
Install temp. probe near inlet hose... then replace the insulator cap.
(Detail L)