Federal Signal Corporation SIGNALMASTER SM518A Instruction Sheet Download Page 2

Before drilling holes in ANY part of a vehicle, be 

sure that both sides of the mounting surface are 

clear of parts that could be damaged; such as brake 

lines, fuel lines, electrical wiring or other vital 

parts.

 

 

3.  Drill two holes at the previously scribed posi-

tion marks.

 

 

4.  Secure the control head to the mounting sur-

face with two user-supplied sheet metal screws.

 

C. 

Electrical Connections.

Failure to observe this WARNING may result 

in fire, burns or blindness.

If shorted to vehicle frame, high current con-

ductors can cause hazardous sparks result-

ing in electrical fires or molten metal.

If additional cable length is required, splice 

the same gauge (or heavier) wire to the leads.

DO NOT connect this system to vehicle bat-

tery until ALL other electrical connections 

are made and mounting of all components is 

complete.

Verify that no short circuits exist, before con-

necting to the Positive (+) battery terminal.

 

 

1.  Power Connections.

 

 

 

a.  Route the red and black 14-gauge wires to 

the power source. Ensure that the power source is capable 

of supplying an additional 25-amperes.

 

 

 

b.  Connect the black wire to a known good 

chassis ground. This connection must be capable of supply-

ing 25-amperes.

 

 

 

c.  Do not connect the red wire to the positive 

(+) power source terminal at this time.

 

 

2.  Control Head Connections.

 

 

 

a.  Wrap the control cable’s stripped wire 

ends with tape and route the cable to the control head 

mounting location.

 

 

 

b.  See figure 2. Crimp five 1/4" straight 

terminals on the cable wire ends and jumper wire combina-

tion.

OF

F

ON

HAZAR

D

FED

ERA

L S

IGN

AL 

CO

RPO

RAT

ION

290A2884

SWITCH

BRACKET

CHASSIS

GROUND LEAD

TO CHASSIS GROUND

SWITCH

ON/OFF/ON

SWITCH ON/OFF

DECAL

RED

NOTE: 
GOLD
(NO. 3)
TERMINAL
ON TOP

Figure 1.

III.  INSTALLATION.

The SignalMaster's circuitry can be damaged, or 

destroyed, by static discharge. To prevent ESD, 

observe anti-static procedures during installation.

 

A. 

SignalMaster Light Assembly.

 

 

Install the light assembly as described in the 

instructions packed with the mounting kit.

 

B. 

Control Head.

When installing equipment inside air bag 

equipped vehicles, the installer MUST ensure 

that the equipment is installed ONLY in areas 

recommended by the vehicle manufacturer.
Failure to observe this warning will reduce 

the effectiveness of the air bag, damage the 

air bag, or potentially damage or dislodge the 

equipment, causing serious injury or death to 

you or others.

 

 

Assemble the control head as shown in figure 

1. For proper operation of the unit, the switches must be 

installed as shown. To install the control head, proceed as 

follows:

NOTE

When selecting a mounting location for the control 

head, it is necessary to keep in mind the Signal-

Master’s cable length. Plan wiring and cable rout-

ing before installation. 

 

 

1.  Select a mounting location for the control head 

that allows the vehicle and controls to be operated safely at 

all times.

 

 

2.  Use the control head as a template and scribe 

two drill position marks at the selected mounting location.

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