SHO-ME 21.7490 Strobe Light Wiring Instructions

Below you will find brief information for Strobe Light 21.7490. The 21.7490 is a powerful strobe light system capable of producing a variety of flash patterns, including double, quad, quintuple and mega flash. It is designed for use on vehicles and can be used to warn other drivers or pedestrians of your presence. This strobe light system is easy to install and comes with all the necessary hardware and instructions.

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SHO-ME
MODEL NO. 21.7490
WIRING INSTRUCTIONS
IMPORTANT! This product is NOT waterproof. It must be mounted to a metal surface in a clean dry area.
TECHNICAL SPECIFICATIONS
INSTALLING THE 21.7490
INPUT VOLTAGE .................... 10 to 30 Vdc
INPUT CURRENT ................... 8.5A at 12.8V, 4.2A at 25.6V
INPUT POWER ........................ 110 Watts
OUTPUT POWER .................... 90 Watts
OUTPUT ENERGY................... 74.4 Joules
FLASH RATES
Double Flash: ................ 170 flashes per minute.
Quad Flash: ................... 140 flashes per minute.
Quintuple Flash: ............ 140 flashes per minute.
Mega Flash:................... 140 flashes per minute.
CONNECTION DIAGRAMS
4 OUTLET POWER SUPPLY
INPUT: 110 WATTS(8.5A)
3. Electrical Hookup
OUTPUT POWER: 90 WATTS
If you have purchased a pre wired switch harness, follow the
included instructions. If you are wiring the system yourself
follow the instructions below and the diagrams on the next page.
YELLOW
RED
GREEN
BLACK
WHITE
BLUE
STROBE OUTLETS
LOW
POWER
CONTROL
FUSE 15A
RED
VIOLET
POWER HARNESS:
POWER
FUSE 15 AMP
BASEPLATE
RED or GREEN
YELLOW
BLACK
GREEN
WHITE
BLUE
1
2
3
RED + 10 to 30 Volts
BLACK - GROUND
VIOLET HIGH/LOW power
Connect to + 10 to 30V for LOW power,
leave unconnected for HIGH power.
4
Power Connector
Strobe Head Outlets
Plug the strobe light heads into the outlets. Keep the following in
mind:
Note: This supply reduces output power when only 2 outlets are activated.
WARNING: High Voltage. Please wait 5 minutes after shutting this
unit off before attempting service. Warranty void if seal is broken.
BLACK
2. Strobe Head installation
The output power divides equally between all strobe heads
installed. Example: 90 Watts into 2 heads = 45 Watts per head.
Consider this before selecting the number and type of strobe
heads to install. Do not exceed the wattage rating of the head.
MANUFACTURED IN U.S.A.
INPUT VOLTAGE: 10 to 30 Vdc
Mount the power supply in a clean, dry location. Mounting the
unit to a flat metal surface will aid in heat dissipation. Use the
power supply as a template to mark the hole locations. The
mounting holes will accept up to a 1/4&quot; bolt. Note: The power
supply baseplate must be connected to chassis ground (GND) to
reduce radio interference.
• Heads connected to outlets 1 and 3 flash at the same time.
• Heads connected to outlets 2 and 4 flash at the same time.
• Heads connected to 1 and 3 alternate with heads 2 and 4.
MODEL NO. 21.7490
SHO-ME
1. Physical Mounting
• Connect the RED wire to battery positive (+) or a fuse panel
circuit rated for at least 15 AMPS.
• Connect the BLACK wire to battery negative (-) or directly to
vehicle chassis.
Note: Use the correct size wire for power connections.
The length of the wires determines the size needed.
1 to 10 ft. use 18AWG wire.
10 to 20 ft. use 16AWG wire.
20 to 35 ft. use 14AWG wire.
35 to 50 ft. use 12AWG wire.
• The VIOLET wire controls HIGH / LOW power. Low power
limits the flash intensity for nighttime use. Connect VIOLET to
+12/24V for LOW power, leave VIOLET disconnected for HIGH
power.
Control Connector
CONTROL HARNESS:
GREEN
BLUE
3 2 1
Ridge indicates pin 1
STROBE HEAD
EXTENSION CABLE
BLACK
VIOLET
YELLOW
3 2 1
CONTROL HARNESS
3 2 1
POWER HARNESS
RED
Heavy duty extension cables have a GREEN wire,
Light duty extension cables have a RED wire.
RED or GREEN
BLACK
WHITE
• YELLOW, GREEN, BLUE wires select the flash pattern and
also control which strobe head outlets are activated. A wire is
'selected' when connected to +12/24V. When all control wires are
unconnected the power supply is in a low current SHUTDOWN
MODE (Current is typically 25ma). See the PATTERN TABLE on
the next page for a complete list of functions.
Note: VIOLET, YELLOW, GREEN and BLUE are all Low Current
circuits and can be wired with a minimum of 22AWG wire.
PATTERN TABLE
WIRING/CONNECTION DIAGRAMS
DIAGRAM (1): ON/OFF and Low Power using two toggle
switches. Flash pattern is: Quad Flash All Heads.
BATTERY +
BATTERY GND, vehicle
chassis.
15
OR CONSTANT
POWER CIRCUIT
Toggle switches:
General purpose Single
Pole Single Throw.
Current through switch is
less than 1 amp.
NO CONNECTION
SPST
PATTERN
NO CONNECTION
POWER HARNESS
YELLOW
1
2
3
NO CONNECTION
ON / OFF
SWITCH
GREEN
SPST
BLUE
CONTROL HARNESS
BATTERY -
BATTERY +
15
NO CONNECTION
Rocker Switch:
General purpose Double
Pole Double Throw.
Current through switch is
less than 1 amp.
POWER HARNESS
YELLOW
BLUE
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
POWER
FUNCTION
SHUTDOWN
Quad Flash, Head 2 ALT 3
Quad Flash, Head 1 ALT 4
Quad Flash, Head 1&amp;3 ALT 2&amp;4
Mega Flash, Head 2 ALT 3
Mega Flash, Head 1&amp;3 ALT 2&amp;4
Mega Flash, Head 1 ALT 4
When in High Power: Quintuple Flash, Head 1&amp;3 ALT 2&amp;4
When in Low Power: Double Flash, Head 1&amp;3 ALT 2&amp;4
TROUBLESHOOTING
Blown Fuse: The 21.7490 will blow a fuse if the input
voltage is reversed. If this happens, first locate the wiring
fault, then replace the fuse with one of the same rating.
NO CONNECTION
Erratic behavior (and/or) shutdown: The 21.7490 will
shut down if there is a short circuit condition on any one of
the strobe heads. If the electrical conductors connecting
the power supply to the strobe heads are exposed to water
a short circuit will result. The first sign is intermittent
operation, followed by complete shutdown of the strobe
system. To find the short circuit, unplug all strobe head
cables from the 21.7490. Test one cable/head at a time
until the problem is found.
GREEN
ACCESSORIES
The following accessories are available to make the
installation of the 21.7490 power supply even easier:
BLUE
CONTROL HARNESS
Unused wires should either be removed, or connected to - Ground.
DIAGRAM (3): Selective switching of strobe head pairs. Low
Power selection. Flash pattern is: Quad Flash All Heads.
BATTERY +
Fuse panel, Ignition or
accessory circuit.
BATTERY GND, vehicle
chassis.
15
Toggle switches:
General purpose Single
Pole Single Throw.
Current through switch is
less than 1 amp.
LOW POWER
SWITCH
NO CONNECTION
D
RE
CK
BLA
LET
VIO
SPST
1
2
3
NO CONNECTION
POWER HARNESS
HEADS 1+4
ON/OFF
YELLOW
NO CONNECTION
GREEN
BLUE
SPST
1
2
3
GREEN
GND, vehicle
chassis.
OR CONSTANT
POWER CIRCUIT
1
2
3
YELLOW
ALT = &quot;Alternates With&quot;
DIAGRAM (2): ON/OFF and Low Power using one DPDT
rocker switch. Flash pattern is: Quad Flash All Heads.
D
RE
CK
BLA
LET
VIO
1
2
3
4
5
6
7
8
Unused wires should either be removed, or connected to - Ground.
1
2
3
Example: Diagram 1 uses pattern #4 (Quad Flash, All Heads).
To change this to pattern #6 (Mega flash, All Heads)
connect the YELLOW and BLUE wires to the switch.
Remove the remaining wires, or connect them to - Ground.
LOW POWER
SWITCH
D
RE
CK
BLA
LET
VIO
1
2
3
Selecting a flash pattern: In the table below, find the desired
flash pattern. Connect the wires marked POWER to the
'load' side of the ON/OFF switch. Remove the remaining
wires, or connect them to - Ground.
CONTROL HARNESS
21.7001 ON/OFF - LOW POWER SWITCH PANEL
A Fully assembled switch panel which provides simple
On/Off and Low power control. Provides the same
functions as shown in Diagram (1)
21.7002 SELECTIVE SWITCHING PANEL
A Fully assembled switch panel which allows selective
switching of strobe head pairs and also includes Low
power control. Provides the same functions as shown in
Diagram (3)
21.7003 ROTARY SWITCH PANEL
A fully assembled switch panel which provides full
selection of all flash patterns as well as On/Off and Low
Power control.
HEADS 2+3
ON/OFF
SPST
All panels are pre-wired with 15'(standard) of cabling.
Unused wires should either be removed, or connected to - Ground.
INSTALL- PS 21.7490.CDR
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Key features

Multiple flash patterns
High/Low power setting
Adjustable strobe intensity
Easy Installation
Protective housing
10 to 30V DC input
90 watt power output
Waterproof design
Double, Quad, Quintuple, Mega Flash patterns

Frequently asked questions

The installation process is outlined in the provided instructions, which include diagrams and step-by-step guidance for wiring the system correctly. You'll need to connect the power harness to your vehicle's battery and ground, and then connect the strobe heads to the outlets on the power supply.

The 21.7490 system allows you to choose different flash patterns using the control wires. Each wire corresponds to a specific pattern, and you can activate a pattern by connecting the wires to a power source. The instruction manual provides a table that details the different patterns and the corresponding control wires.

The 21.7490 system includes a low power setting for nighttime use. You can reduce the flash intensity by connecting the VIOLET wire to the +12/24V power source. If you want high power, leave the VIOLET wire disconnected.