Wiring Diagram
rev. 04-20-09 part no. 99678 Page 3 of 4
1.
Connect the motor wires to the control module (Red wire to the "M+" terminal and black
wire to the "M-" terminal).
2.
Use the large diameter red (10 AWG) wire to run power directly from the battery positive (+)
terminal to 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, ring, and butt connec-
tors provided.
3.
Use the large diameter black (10 AWG) wire to run from the negative (-) battery terminal to
the "G" terminal on the control module. Use the yellow female connector and ring connector
provided.
4.
Use the small diameter red wire (14 AWG) to connect the "+" terminal on the control mod-
ule to a positive power source.
NOTE: Attaching this wire to an ignition-controlled source
will shut off the fan when the engine is turned off. 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.
5.
(Mandatory) With air conditioning, connect the "C" terminal on the control module to the
positive
wire that triggers the A/C compressor using the small diameter green (14 AWG) wire.
Using a voltmeter, determine which wire coming from the compressor is the
positive
trigger
wire. Use the 3-way connector (included) to tap into this wire and send a signal to the fan
control module. The fan will cycle on and off with the A/C clutch when the A/C is turned on.
6.
(Optional) For manual switch operation, use Flex-a-lite p/n 31148. Connect the switch as
shown on the wiring diagram (previous page). 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 re-
main connected. If not using a Flex-a-lite manual switch, do not connect a ground wire
to the switch!
Thick Red
Colored
Black
Thick
Black
