Flex-a-Lite 143 Electric Cooling Fan - Manual (Page 2)

Wiring Instructions Model 111&133
Step 1: Locate mounting point for the control unit
Locate a mounting point for the control box near inlet side of the radiator. The control unit needs to be placed
within about 18" of radiator inlet hose. The inner fender next to the radiator may be a convenient location.
Attach the control unit using the screws provided.
Step 2: Wire the fan motor (refer to Wiring Diagram, below)
Using the blue connectors provided, attach a length of the thick (12 AWG) red wire to the red motor wires at
fan. Attach a length of the thick (12 AWG) black wire to the black motor wires at the fan. Once the fan is in
place, these will attach to the control unit. Be sure to leave enough wire to reach the control unit.
Rev. 08-13-14 98111 Page 2 of 3
NOTE: Models 123 & 143 do not include a fan control unit; skip to page 3 of instructions.
3a. (Model 111 only) Connect the fan wires to the control unit
Now connect the fan motor wires to the control unit. Using blue female connectors provided, connect the red
wire you attached to the fan motor wire in Step 2 to the "M+" terminal. Connect the black wire to the "M-"
terminal on the control unit. NOTE: Failure to do this will result in incorrect operation and damage to fan
motors!
3b. (Model 133 only) Connect the fan wires to the control unit
Now connect the fan motor wires to the control unit. Using blue female connectors provided, connect the
black wire you attached to the fan motor wire in Step 2 to the "M+" terminal. Connect the red wire to the "M-"
terminal on the control unit. NOTE: Failure to do this will result in incorrect operation and damage to fan
motors!
4. Connect power leads
Disconnect the battery negative lead for safety before completing wiring. Determine the length needed to run
thick red and black wire from the control unit to the battery terminals and trim appropriately. Crimp a large ring
connector to one end of the each wire and connect the black wire to the negative (-) battery terminal, but do
not connect the red wire yet. Using butt connectors, connect the fuse holder provided inline with the red wire.
The fuse and fuse holder will protect the fan motors and your vehicle's electrical system from damage. Attach
the red wire to the "B" terminal and the black wire to the "G" terminal on the control unit.
FOLLOW THESE INSTRUCTIONS CAREFULLY TO AVOID DAMAGING THE CONTROL
UNIT, FAN MOTORS, AND YOUR VEHICLE! WHEN CRIMPING WIRES, ALWAYS USE
A QUALITY CRIMPING TOOL (DO NOT USE PLIERS OR OTHER DEVICES).
WIRING DIAGRAM - MODEL 111 (PULLER CONFIGURATION)
WIRING DIAGRAM - MODEL 133 (PUSHER CONFIGURATION)