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Installation and Operation Instructions
3730 Series Surface Mount LED Heads
3730 series LED heads are compact yet versatile high intensity directional LED warning lights suitable for mounting anywhere on a vehicle. Colorless until illuminated, these discrete
LED heads feature urethane encapsulated electronics offering
a high degree of environmental and vibration protection.
Additional benets of these LED lights include low current
draw, a long and maintenance free service life with reliable
solid-state operation and extremely low electromagnetic emissions. These LED heads feature 12-24V operation, multiple
user-selectable ash patterns and synchronization capability.
WARNING!
Failure to install or use this product according to manufacturers recommendations may result in property
damage, serious bodily/personal injury, and/or death to you and those you are seeking to protect!
Do not install and/or operate this safety product unless you have read and understand the
safety information contained in this manual.
1. Proper installation combined with operator training in the use, care, and maintenance of emergency warning devices are
essential to ensure the safety of you and those you are seeking to protect.
2. Exercise caution when working with live electrical connections.
3. This product must be properly grounded. Inadequate grounding and/or shorting of electrical connections can cause high
current arcing, which can cause personal injury and/or severe vehicle damage, including re.
4. Proper placement and installation are vital to the performance of this warning device. Install this product so that output
performance of the system is maximized and the controls are placed within convenient reach of the operator so that s/he
can operate the system without losing eye contact with the roadway.
5. It is the responsibility of the vehicle operator to ensure during use that all features of this product work correctly. In use, the
vehicle operator should ensure the projection of the warning signal is not blocked by vehicle components (i.e., open trunks
or compartment doors), people, vehicles, or other obstructions.
6. The use of this or any other warning device does not ensure all drivers can or will observe or react to a warning signal.
Never take the right-of-way for granted. It is your responsibility to be sure you can proceed safely before entering an
intersection, driving against trafc, responding at a high rate of speed, or walking on or around trafc lanes.
7. This equipment is intended for use by authorized personnel only. The user is responsible for understanding and obeying
all laws regarding warning signal devices. Therefore, the user should check all applicable city, state, and federal laws and
regulations. The manufacturer assumes no liability for any loss resulting from the use of this warning device.
Specications:
Contents:
1 x 3730 Series Surface Mount LED Head
1 x Installation and Operating Instructions
1 x Mounting gasket
2 x Front mounting screws (# 6 x 1 1/4” Self Tapping),
with washers and nuts.
Size:
3.7”[94mm] length, 1.3”[34mm] width,
Input Voltage: Model 3730: 12-24 VDC (9-32V)
Current Draw: Model 3730: 650mA peak
Operating temperature range: -40 to +50ºC
1.5”[39mm] height
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Installation & Mounting:
Before installation, examine the LED heads for transit damage.
Do not use damaged or broken parts.
Important! This unit is a safety device, and it must be connected to its own separate, fused power point to assure its
continued operation should any other electrical accessory fail.
Mounting:
The 3730 LED heads are surface mounted by screwing through
the two front-mounting bosses. The LED heads can be stacked
vertically or horizontally to provide higher intensity where required.
1. The 3730 series LED heads should be mounted to a at
surface or one with the least amount of curvature. The
mounting location should allow the maximum visibility of
the warning device to other road users, while allowing for
sufcient wire access.
Wire functions are as follows:
Green Wire: Ground. Connect to either the battery negative
terminal or a suitable chassis point.
Red Wire: Power. Switch to +12/24V to operate the ash-
er. Must be powered through the fuse, located
as close to the battery terminal as possible.
Yellow Wire: Flash pattern set. Apply +12/24V momentarily
(< 1 sec) to cycle through the available ash
patterns (see table below). Holding power on
this wire for > 1 sec will select the previous pattern.
Blue Wire: Sync wire. Connect to other blue sync wires of
other 3730 LED heads to allow synchronizing of
ash patterns (see notes). Connecting the sync
wires together does not alter the ash patterns
in any of the LED heads – it only controls the
relative timing of the ash patterns (see notes
on page 4). This wire may also be connected to
other compatible ECCO synchronizing products.
If unused, leave unconnected and insulated.
Caution: When drilling into any vehicle surface, make
sure the area is free from any electrical wires, fuel lines,
vehicle upholstery, etc. that could be damaged
2. Using the supplied mounting gasket as a template, mark
the drill hole locations on the mounting surface. Details of
the hole locations are also given in Figure 1.
Figure 1 - Rear of LED head. Dimensions are in inches [mm].
3. Drill mounting holes using a #31[0.120”] drill bit.
4. Drill a 25/64”[10mm] hole for the wires protruding from the
rear of the unit at the location in Figure 1. Remove any
sharp edges from this hole.
5. Mount the LED Head along with the mounting gasket, routing the wires through the 10mm hole and use additional
grommets or cable protection as necessary to protect the
wiring from any sharp edges. Secure the LED head to the
surface using the #6 self-tapping screws as supplied.
Wiring Instructions
The 3730 LED heads are self-ashing units. A 3A fuse must be
used for each set of up to and including 4 LED heads
Flash Patterns
The 3730 series LED heads can be congured to ash the
following patterns (in the order below) by momentarily applying
power to the yellow wire as described in the wiring section. The
LED head must be powered through the green and red wires to
allow pattern selection.
Flash pattern Flash rate
No. Style Phase
1. Steady N/A N/A
2. Single A
3. Single B
4. Single A
5. Single B
6. Double A
7. Double B
8. Triple A
9. Triple B
10. Quad A
11.
Quad B
12. Quint Hold A
13. Quint Hold
14. Fast Double A
15. Fast Double B
16. Pulse N/A N/A
17. Pulse8 A
18. Pulse8 B
19. Alternating Double A
20. Alternating Double B
21. Alternating Quad A
22. Alternating Quad B
23. Alternating Fast Double A
24. Alternating Fast Double B
25. Random N/A N/A
B
60 FPM
120 FPM
75 FPM
132 FPM
75 FPM
142 FPM
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6-32 x 1-1/4
MOUNTING
SELF-TAPPING
SCREWS
FIGURE 3 - A3730BKT
UNIVERSAL BRACKET
MOUNTING
BRACKET
Mounting Brackets (Optional accessories, sold separately.)
Mount the 3730 on the bracket as shown in the appropriate diagram. Push the two 6-32 x 1-1/4 screws through the mounting
holes at the front of the unit and through the holes in the rubber
mounting gasket. Drive the self-tapping screws through the
holes or slots of the bracket.
Brackets with holes, instead of slots, do not require washers and
nuts once the screw has been torqued to 15 in-lb. It is recommended that excess screw length be trimmed.
Caution: Do not overtighten the screws.
6-32 x 1-1/4
SELF-TAPPING
SCREWS
FIGURE 4 - A3730TNK
BOOT/TRUNK BRACKET
MOUNTING
BRACKET
BRACKET
6-32 x 1-1/4
SELF-TAPPING
SCREWS
FIGURE 5 - A3730DCK
DECK BRACKET
US style license plate only.
MOUNTING
BRACKET
MOUNTING
BRACKET
6-32 x 1-1/4
SELF-TAPPING
SCREWS
ADHESIVE PAD
FIGURE 6 - A3730WIN
WINDOW BRACKET
Make sure the mounting surface is clean before applying the
bracket. A 50% isopropyl alcohol and 50% water solution is
recommended for cleaning the mounting surface. Remove the
backing from the adhesive pad on the bracket. Press the ad-
hesive on the bracket rmly against the mounting surface. The
adhesive will reach 20% of its maximum bond after 20 minutes,
75% after 1 hour, and 100% after 3 days. Mount the 3730 to the
bracket as shown using the two #6 screws through the front of
the unit.
6-32 x 1-1/4
SELF-TAPPING
SCREWS
FIGURE 7 - A3730LIC
LICENSE PLATE BRACKET
Mount the A3730LIC bracket to the lower or upper two license
plate screw holes between the plate and the vehicle. Then,
mount the 3730 lights onto the bracket as shown.
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Notes on Synchronizing and Phase:
Phases A and B for each style of ash pattern in the table denote the relative timing between LED heads connected in a synchronizing
installation. To operate simultaneously, each LED must be set to the same phase (A + A or B + B); to operate alternately, LED heads
must be set to have the opposite phase (A + B or B + A).
To simplify the set-up of a synchronized installation, the following process is recommended:
1. Determine the desired style of ash pattern for each LED head and set each unit individually (without the BLUE wires connected
together) to avoid confusion. It is also strongly recommended that the same style of ash pattern be used on all heads to produce
the most effective warning pattern.
2. Connect the BLUE (SYNC) wires together and check that the LED heads are ashing in a synchronized manner as expected. If a
pattern on one module appears to be wrong, the YELLOW (PATTERN SET) wire can be used to cycle forward or backward on that
individual LED head until the correct pattern is selected. Note: This will only change the pattern in the one LED head and will not
affect the other units connected to the BLUE (SYNC) wire.
Synchronizing Example
As an example, an installation is required where there are two LED heads on the front driver side of the vehicle and two LED heads
on the front passenger side of the vehicle. The LED heads are to ash alternate sides of the vehicle with a synchronized quad-ash
style of ash pattern. First, congure the two LED heads for the driver side of the vehicle to pattern 4 (quad-ash style, phase A). Now
congure the other two LED heads for the passenger side with pattern 5 (quad-ash style, phase B). Connect the blue wires from the
four LED heads together. When power is switched to the LED heads, they should ash as expected (passenger side LED heads will
alternate with driver side LED heads). If necessary, corrections can be made to the ash patterns on each LED head individually with
the wiring complete.
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