Derale Performance, Los Angeles, CA
800.421.6288 www.derale.com
Warning:
Installation of accessories should only be undertaken by those with mechanical knowledge and are familiar with working on
vehicles. Always use eye protection (goggles, safety glasses or shield). Park the vehicle in a well lit area, on level ground and apply the
parking brake. Only work on a cold vehicle that has been sitting overnight, failure to do so will result in severe burns and injury. Before starting
the vehicle, make sure no tools or any other items are left under hood that could interfere with or be drawn into moving parts of the engine.
Failure to follow instructions can lead to severe damage and personal injury.
TROUBLE SHOOTING Q&A
Q: Why doesn’t the fan(s) turn on?
A: 1. Check all connections to make sure all contacts are crimped correctly.
2. Check all Ground (-) connections to make sure all paint is sanded off and you are getting a metal to metal contact.
Q: Why does the fan(s) run after the engine is turned off?
A: Check the wire going to the Thermostat Switch, this wire should be connected to a 12V Positive (+) switched ignition
source.
Q: Why doesn’t the fan(s) turn on when I use the Override function?
A: To quickly test the Override circuit, disconnect the Green Wire and run a jumper wire directly to the Positive (+) terminal on
the battery. The electric fan should start immediately. If fan started, reattach the Green Wire to the proper (+) wire on the
A/C clutch or Manual Switch.
Diagram #4
Diagram #2
Diagram #3
For manual switch wiring, refer to
switch manufacturer instructions.
15Amp Fuse
+12V
Ignition Power
Green Wire
Manual Switch Override Instructions
(Switch Not Included)
Chassis
Ground (-)
Blue
Fan
Positive (+)
Orange
Fan
Positive (+)
30Amp Fuse
Chassis
Ground (-)
Ignition
Switch
Red
30
86
85
87
Green
Orange
Yellow
Black
Chassis
Ground (-)
12 Volt Positive (+)
Battery
Thermostat
Switch
RELAY
Override Circuit
(Optional)
FAN MOTOR
#1
FAN MOTOR
#2
30amp Fuse
Red Wire
Battery Power
12V (+)
Black Wire
Chassis Ground (-)
Green Wire
Optional A/C
Override (+)
One Way Diode
Orange Wire
Positive (+)
Fan Lead
Blue Wire Optional Secondary Fan
Positive (+) Lead
Yellow Wire
to Thermostat Switch
then to 12V (+)
Ignition Switch
IMPORTANT
: This single stage electric fan thermostat will control up to two different fans with a
If fans exceed 25 amps combined we recommend using one switch per fan.
COMBINED MAXIMUM DRAW
OF 25 CONTINUOUS AMPS.
