Installation & Mounting:
Before installation, examine the LED heads for transit damage.
Do not use damaged or broken parts.
920-3800-00 Rev. D
Page 2 of 3
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
Important!
This unit is a safety device, and it must be con-
nected to its own separate, fused power point to assure its
continued operation should any other electrical accessory fail.
Mounting:
The 3811 LED heads are surface mounted by screwing through
the two front-mounting bosses.
1. The 3811 series LED heads should be mounted to a flat
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
sufficient wire access.
2. Using the supplied mounting gasket as a template, mark
the drill hole locations on the mounting surface.
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, rout-
ing 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 3800 LED heads are self-flashing units. A 3A fuse must be
used for each set of up to 4 LED heads
Wire functions are as follows:
Black Wire:
Ground. Connect to either the battery negative
terminal or a suitable chassis point.
Red Wire:
Power. Switch to 12-24V to operate the
lighthood. Must be powered through the fuse,
located as close to the battery terminal as
possible.
Blue Wire:
Flash pattern set. Touch wire to Ground mo-
mentarily (< 1 sec) to cycle through the available
flash patterns (see table below). See the Blue
Wire Function table below.
Yellow Wire:
Sync.
Flash Patterns:
The 3800 series LED heads can be configured to flash the
following patterns (in the order below) by momentarily applying
ground to the blue wire as described in the wiring section. The
LED head must be powered through the black and red wires to
allow pattern selection.
Flash pattern
No.
Style
Flash rate
Phase
1.
Single
75
A
2.
Single
75
B
3.
Double
75
A
4.
Double
75
B
5.
Quad
75
A
6.
Quad
75
B
7.
NFPA
75
8.
Single
120
A
9.
Single
120
B
10. Double
120
A
11. Double
120
B
12. Quad
120
A
13. Quad
120
B
BLACK (GND)
RED (+VE)
BLUE (SET)
FUSE
CHASSIS
GROUND
BLUE (SET)
YELLOW (SYNC)
Blue Wire Function Table
Push Time
Function
0-1 Sec.
Next Pattern/on
1-3 Sec
Previous Pattern
3-5 Sec.
Factory Default(Pattern 1: Single Flash 75
FPM p1)
5- Sec.
OFF
