SC-1002 / 1012 / 1022-10 Ver. B Installation Instructions Page 7 of 16
CP5028A 03/11/10
ELECTRICAL CONNECTIONS
Electrical connections to the unit are made using terminal block plugs and screw terminals located
on the amplifier. Labels on the unit identify each terminal function. Install the plug on the unit
before wiring. If the unit needs service the plug can be easily removed without unwiring. The
power supply of the unit must be capable of delivering peak currents up to 50 amps for adequate
short circuit protection and reliable operation. The preferred source is directly at the vehicle bat-
tery. The amplifier is fused.
Attach leads by stripping 3/8”, inserting into plug and clamp by tightening screw. Make sure the
screw is tight and the wire can’t be pulled out.
Failure to adequately tighten the screw can result in improper operation or burning the
connector and wire.
Wire Size and Termination - The diagram shows the minimum wire size used for each connec-
tion, along with recommended lead color. If the wire is longer than 10 ft. use the next larger wire
size. Use only high quality crimp connectors for installation on the vehicle.
Enable Input Connection (ORG lead on wiring diagram next page) - This is NOT
the same as
the main power connection. The enable input is like a power switch for the unit. When there is
positive power at this connection, the unit is powered up and ready to function. When power is
removed, the unit is not
powered up and will not drain current from the battery. Connect to a
positive circuit controlled by the vehicle ignition switch, usually a terminal at the vehicle fuse
panel. The required current is low (15mA typ.).
For SC-1022:
The Enable Input must be connected.
For SC-1002 and SC-1012:
The Enable Input is optional.
The unit will instantly turn on when a switch on the face of the unit or the control panel
is activated. This includes LT1 and LT2 switches.
When all switches are deactivated, the unit will turn off.
Without the enable input, the Manual siren tone will stop immediately.
LT1 or LT2 switch may be used as power switch for the unit instead of Enable Input.
Auxiliary Input Connection (Optional) - A momentary input typically connected to the horn ring
of the vehicle or other switch. See OPERATION section for auxiliary input functions.
NOTE: Permanent disconnection of the vehicle horn is NOT recommended.
The auxiliary input may be activated with positive or negative voltage. See Auxiliary Polarity
under OPTION SWITCHES section for proper activation polarity. Input current is 1 to 20 mA.
Aux Input for SC-1002 and SC-1012:
The unit must be turned on for the Auxiliary Input to function. This is accomplished
with either the siren controls or Enable Input.
Unit turned on with switch on face of unit or
control panel. This includes LT1 or LT2.
Unit turned on
with enable input
Auxiliary Input
will Function
NO NO NO
YES NO YES
NO YES YES
YES YES YES
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