Wiring the Legend in the Vehicle
31
Installation, Operation, and Service Manual
Federal Signal
www.fedsig.com
LOW POWER
LOW LIGHT HAZARD: Enabling the Low Power function in the light bar may
cause the light output to fall below certain current light output standards
and guidelines for emergency warning lights. Use extreme caution when
using this function. Ensure that the ambient light conditions are low enough
that you are seen and that the reduction of glare from the light bar is safer
than full light output in the situation. Failure to heed this warning may result
in serious injury or death to you or others in your vicinity.
NOTE:
Low power mode is disabled when the light bar is in MODE 3 or displaying
the INTERSECTION flash pattern.
When 12 Vdc (+BAT) is applied to the LOW POWER control wire, the LEDs are
dimmed to approximately 50 percent of their full brightness. LOW POWER is
only functional in MODE 1 or MODE 2. LOW POWER is disabled when switching
to another flash pattern, including INTERSECTION. To use LOW POWER again,
disconnect 12 Vdc from the LOW POWER control wire and reapply 12 Vdc to the
LOW POWER control wire after a change in flash pattern occurs.
IGNITION
Connect the white wire from the supplied J1 cable harness on the Interface Module
to a 1 A fuse. Connect the fuse end as close as possible to switched ignition power.
Power should also be present in the cranking position.
Connect the black and black/white wire from the 24-pin cable harness on J1 from
the Serial Interface Module to battery ground (–GND). Use 16 AWG wire to extend
the cable length.
SignalMaster Connections
If SignalMaster operation is not activated by a control head or external controller, the
SignalMaster LED heads flash with the selected priority mode (MODE 1, 2, or 3) of
operation.
Internal SignalMaster
Internal operation (factory default setting) uses the light bar’s built-in
SignalMaster controller to generate directional warning patterns. With internal
operation, an external SignalMaster controller is not needed. A standard low
current switch box can activate the light bar’s internal SignalMaster controller.
For the jumper setting in the Serial Interface Module, see “Selecting Internal
SignalMaster Control (Factory Default" on page 21. To activate the light bar’s
internal SignalMaster controller, apply 12 Vdc (+BAT) to the SignalMaster control
wires.
External SignalMaster
External operation uses the Serial Interface Module to drive each SignalMaster
directional warning head independently through an external Federal Signal
