Car Security and Convenience / Basic Alarm Input Connections
The wires and connections listed
below will not apply to all alarms. Some alarm
installations will require the addition of diodes,
and/or other parts. Always read your installation manual first.
Connect to a wire or switch that provides ground (-) when hood/trunk
is opened. If positive (+) 12 V DC is present when hood/trunk is closed
on the same wire, use a blocking
diode with the cathode towards the switch.
Connect to the (-) negative output of a sensor or triggering device.
Many alarms will have additional (-) negative inputs to accommodate additional
sensors or ports to allow their proprietary sensors to plug directly into
them. Some offer both. If the alarm only has one input and you need to connect
two or more sensors, use a blocking
diode on each output wire of each sensor.
Brake (+) Input
This connection is only needed for remote start units.
Connect to the wire that only shows (+) positive
12 V DC when the brake pedal is being pushed. This
switch is usually located just above or behind the
brake pedal onmost vehicles.
Parking Brake (-) Input
This connection is typically only needed for some
manual safe remote start units. Connect to the wire
that only shows (-) ground when the parking brake is
Valet / Override Switches
Many of today's alarms have a port to plug the valet/ override switch(es)
directly into them. If not connect one wire of the switch(es) to ground
and the other to the specified input of the alarm. If your alarm requires
a positive input, then connect the first wire to (+) 12 V DC. See your installation
manual for more info.