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Sigtronics Emergency Unit Radio / Music Switcher
Installation and Operating Instructions Model SRS-M
Emergency Radio Switcher Features
The Emergency Radio Switcher allows AM / FM radio to be
heard whenever mobile radio communication is not occurring. Great for monitoring traffic and weather reports, AM /
FM radio will not be heard over mobile radio, it will automatically be muted when communications occur.
For Use With
Sigtronics MRIM-2 systems
Installation
Attach the Radio Switcher in a convenient location using the
adhesive mounting strips. See table below and diagram on
page 2 to connect the wiring harness.
1. Unplug the P1-J1 connector on the MRIM-2 and plug the
Music Switcher in line.
2. Connect the cable in the kit to the remaining connector
on the Music Switcher. Connect the RED wire to the music
Common Ground Music
Source
Right Violet Right + Violet
Common Orange / Green Right – Orange
Floating Ground Music
Source *
ON/OFF switch center lug. Connect to +12 Volts through
the switch and fuse as shown in the drawing.
3. Depending on whether your music source has a common
ground output or floating ground output, connect it as
shown in table.
Operating Instructions
1. With music source turned OFF, adjust the MRIM-2 as
described in the system instructions.
2. Turn ON the music source and the music ON / OFF switch,
if equipped. During periods when there is no communications radio traffic, the music source will be switched into
the headphones. Adjust the volume on the music source
for a comfortable volume level.
Warranty: One year parts and labor.
Standard Equipment Included
Part Description Part Number Quantity
Cable, SRS, 5 Conductor,
Switch, SPST with Fuse
Foam, Double Sided 100720 2
800088 1
Left Gray Left + Gray
Left – Green
* IMPORTANT: In a floating ground music system, NEVER con-
nect any of the four output wires together or to ground !
Specialists in “SOUND” Management
178 East Arrow Highway, San Dimas, CA 91773 ( 909 ) 305-9399
Made in the U.S.A.
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the music source outputs to chassis or vehicle frame.
3. Connect the Violet and Orange wires to the right channel + and – output of the music source.
Connect the Gray and Green wires to the left channel + and – output. Do no t connect any of
Notes:
1. Unplug P1–J1 of MRIM-2 unit and plug the music Switcher inline.
2. Connect the Red wire to +12V power through the music On / O switch and fuse as shown.
Radio / Music
Emergency Unit Radio / Music Switcher Installation Drawing
Speaker
MRIM-2
Output
Note 3
Right + Violet (J3–5)
Right – Orange (J3–4)
Left + Gray (J3–2)
Left – Green (J3–1)
178 East Arrow Highway
San Dimas, CA 91773
Sigtronics Corporation
SRS-M
P1
Note 1
Radio Switcher
P3
J3
Models SRS-M
Red (J3–7) Connect to Center Lug of Switch
On / O
Switch
Music
Note 1
J1
Note 2
To Headsets
(1 AMP)
Fuse
Phone: (909) 305-9399
E-mail: info@sigtronics.com
Web Site: www.sigtronics.com
+11 to +16 VDC
Power Buss
To Vehicle
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3-11-2013 srs-m_instr.pdf
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