Instructions - Summitracing
INSTALLATION INSTRUCTIONS
SINGLE STAGE ELECTRIC FAN THERMOSTAT
PART # 16738
Please read these instructions completely before beginning installation
KIT CONTENTS
QTY. DESCRIPTION
1 Thermostat Switch
1 Relay Wire Harness
1 Push-in Probe
1 1 x 1 Foam Pad
1 Retaining Clip
4 4” Wire Ties
QTY. DESCRIPTION
1 Blue 5/16” Ring Terminal
3 Blue #10 Ring Terminal
2 Blue Butt Connectors
2 Blue Female Connectors
2 Blue Wire Tap Connectors
4 #10 Sheet Metal Screw
TOOLS NEEDED
12V Test Light
Wire Stripper
Crimping Tool
Standard Screw Driver
or a 5/16” Nut Driver
Drill
5/32” Drill Bit
IMPORTANT
This single stage electric fan thermostat will
THERMOSTAT PROBE INSTALLATION
control up to two different fans with a COMBINED
Placement: For best results we recommend installing the probe as close
MAXIMUM DRAW OF 25 CONTINUOUS AMPS.
as possible to the water inlet of the radiator.
If fans exceed 25 amps combined we recommend
using one switch per fan.
Installation:
1. Take the Push-in Probe and thread it clockwise onto the Thermostat Switch.
2. Carefully insert the probe/thermostat assembly into the fins of the radiator Diagram #1
until Thermostat Switch is flush with radiator.
Radiator
3. Install the 1 x 1 Foam Pad onto the Push-in Probe.
4. Install Retaining Clip onto the Push-in Probe until tight.
Foam Pad
(See Diagram #1)
Push-in
Probe
RELAY WIRE HARNESS MOUNTING
1.
Taking into consideration probe placement and wire routing requirements,
choose a convenient location. Avoid mounting near HOT engine components.
2. Using the relay bracket as a template, mark and drill a 5/32” hole in the
proper location.
3. Using the #10 Sheet Metal Screws provided, install the relay/wire harness.
Thermostat
Switch
Retaining
Clip
WIRING
Before starting, disconnect the Negative (-) cable on the vehicles battery.
Using the electrical connectors and wire ties provided, follow the directions below.
WARNING: When extending wires always use the identical gauge wire as provided.
Reference Diagrams # 2 & 3 on reverse side.
Red: Using the Blue 5/16” Ring Terminal provided attach to the Positive (+) terminal of the battery.
Black: Using the Blue #10 Ring Terminal and #10 Sheet Metal Screw provided attach to a good chassis ground (-).
Yellow Wire: Using the Blue Female Connector provided attach to EITHER of the two terminals on the thermostat.
Thermostat Wire: Using the Blue Wire Tap and Blue Female Connector provided attach the remaining Thermostat terminal to
a 12V switched ignition source.
Warning: Attaching this wire directly to a 12V non-switched source will allow the fan to run after the vehicle has been turned off
which could effect the vehicles battery performance.
Green (Optional): The green wire is designed to work in two different configurations. When used, this will allow the fan(s) to
be turned on regardless of the temperature of the thermostat as it simply overrides all other functions. If you choose to not use
this option disregard the wire.
1. A/C Override - Using the Blue Wire Tap provided, attach the green wire to the positive lead on the air conditioning compressor.
2. Manual Switch Override - Attach the Green Wire to the manual switch NOT PROVIDED. See Diagram #4 on reverse side.
For Manual Switch installation always follow manufactures instructions.
SINGLE FAN CONFIGURATION
Orange Wire: Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead.
Negative Fan Wire: Using a #10 Blue Ring Terminal provided attach the Negative (-) electric fan lead to a good chassis ground (-).
Blue Wire: Disregard, cut any exposed copper and tape or shrink wrap the end of the wire.
DUAL FAN CONFIGURATION
Fan #1
Orange Wire: Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead on fan #1.
Fan #2
Blue Wire: Using a Blue Butt Connector provided attach the Blue wire to the Positive (+) electric fan lead on fan #2.
Negative Fan Wires: Using a #10 Blue Ring Terminal provided, attach BOTH Negative (-) electric fan leads to a good chassis ground (-).
Reattach the Negative (-) cable on the vehicles battery.
(Continues on reverse side)
Derale Performance, Los Angeles, CA 800.421.6288 www.derale.com
16738-InstructionSheet
Rev-3-11-2011
Diagram #2
Yellow Wire
to Thermostat Switch
then to 12V (+)
Ignition Switch
Red Wire
Battery Power
12V (+)
Green Wire
Optional A/C
Override (+)
One Way Diode
30amp Fuse
Orange Wire
Positive (+)
Fan Lead
Blue Wire Optional Secondary Fan
Positive (+) Lead
Black Wire
Chassis Ground (-)
IMPORTANT: This single stage electric fan thermostat will control up to two different fans with a COMBINED MAXIMUM DRAW
OF 25 CONTINUOUS AMPS. If fans exceed 25 amps combined we recommend using one switch per fan.
Diagram #3
Diagram #4
12 Volt Positive (+)
Battery
Manual Switch Override Instructions
Red
30
86
RELAY
85
87
(Switch Not Included)
Black
Chassis
Ground (-)
+12V
Ignition Power
Override Circuit
(Optional)
15Amp Fuse
Green
Yellow
Ignition
Switch
Orange
Thermostat
Switch
30Amp Fuse
FAN MOTOR
#1
Chassis
Ground (-)
Green Wire
FAN MOTOR
Orange
Fan
Positive (+)
Blue
Fan
Positive (+)
#2
For manual switch wiring, refer to
switch manufacturer instructions.
Chassis
Ground (-)
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.
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.
Derale Performance, Los Angeles, CA
800.421.6288
www.derale.com
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