Derale 16739 Installation Instructions

Please read these instructions completely before beginning installation
QTY. DESCRIPTION
1 Thermostat Switch
1 Relay Wire Harness
1 3/8" NPT Thread-in Probe
4 4" Wire Ties
4 #10 Sheet Metal Screw
THERMOSTAT PROBE INSTALLATION
Placement: Locate a 3/8" NPT port on the vehicle,
the vehicles radiator, manifold or water outlet.
Installation:
1. Using Teflon Tape or suitable sealant install the
Probe into the port on the vehicle.
2. Carefully thread the Thermostat Switch clockwise into the
Thread-in Probe now installed on the vehicle. Sealant such as loctite
can be used for permanent installation. (See Diagram #1)
NOTE: DO NOT TIGHTEN THERMOSTAT WITH A WRENCH, HAND
TIGHTEN ONLY.
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.
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 terminals wires 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.
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
SINGLE STAGE ELECTRIC FAN THERMOSTAT
KIT CONTENTS
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

INSTALLATION INSTRUCTIONS

PART # 16739
generally found on
3/8" NPT Thread-in
3/8" NPT
,
800.421.6288
TOOLS NEEDED
12V Test Light Teflon Tape
Standard Screw Driver
Wire Stripper
or a 5/16" Nut Driver
Crimping Tool
Drill
3/4" Wrench
5/32" Drill Bit
IMPORTANT
This single stage electric fan thermostat will
control up to two different fans with a
MAXIMUM DRAW OF 25 CONTINUOUS AMPS.
If fans exceed 25 amps combined we recommend
using one switch per fan.
Diagram #1
Water Jacket
See Diagram #4 on reverse side.
www.derale.com
COMBINED
Thermostat
3/8" NPT 3/8" NPT
Brass Probe Brass Probe
16739-InstructionSheet Rev-3-11-2011