Wiring the Reliant Light Bar in the Vehicle
14
Reliant
™
Light Bar
Federal Signal www.fedsig.com
REVERSE POLARITY / MISWIRING: Reverse polarity or incorrect voltage may
damage the light. To avoid damage to the light, ensure that the battery voltage
is the same as the voltage rating of the light and that the correct polarity is
observed. If you are connecting to a cigarette lighter plug or 12 V outlet, connect
the positive wire to the center terminal and connect the negative wire to the outer
terminal.
To make the power connections:
1. Ensure that the lines are adequately fused as shown in Figure 1 on page 11.
2. From the light bar, route the cables into the vehicle cab. The connectors are not
waterproof. Position the connectors near the edge of the headliner or other easily
accessible location to minimize disassembly should service ever be required.
3. Crimp the supplied terminals to the user-supplied 10 AWG red and black wires. Use
the appropriate tool (Molex hand tool 0638114700). Insert the red wire into the #1
position on the connector and the black wire into the #2 position. (See the connector
on the light bar harness for reference.) Connect the CAT5 cable to the user-supplied
CAT5 extension with the supplied coupler.
4. Route and connect the black lead from the light bar to the vehicle battery’s ground
(–GND) terminal.
5. Route and connect the red lead from the light bar through a 40 A MAXI
®
fuse at the
source, which is the positive battery terminal (+BAT).
NOTE: Powering multiple devices with a common control wire may cause one or more
devices to briefly remain functional after signal power is removed. For example, due to
the high input filter capacitance, a strobe supply can briefly supply the current required
to signal a light bar function to remain on. If necessary, use a relay to isolate devices with
large filter capacitors. See Figure 3. All components/wires are user-supplied.
Figure 3 Relay for isolating devices with large filter capacitors
290A7446
+12 Vdc
Control Lead
(12 Vdc Signal Activated)
Relay
Fuse*
Strobe Supply
*Fuse Amperage depends on amperage of devices.
SHOCK HAZARD: Strobe and HID light systems generate high voltages.
Disconnect power from the system and wait at least 5 minutes before opening the
unit. Do not apply power to the unit while the unit is open. Failure to follow this
warning could result in serious injury or death.