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Car Security - Basic Connections / Inputs
The leads and connections listed
below will not apply to all alarms. Some alarm
installations will require the addition of diodes
, relays, resistors,
and/or other parts. Always read your installation manual first.
Inputs
Power Connections
Triggers
Valet Switches
Outputs
Power Connections
Power (+) 12 VDC
Connect to the positive terminal of the battery using the
appropriate size fuse(s). See your installation manual for more info.
Ground (-) 12 VDC
Connect to any clean and solid chassis ground source. See
your installation manual for more info.
Ignition (+) Input
Connect to a source that has (+)12 VDC only when the ignition
key is in the run and start positions. See your installation manual for
more info.
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Triggers
Door Trigger (-) Input
Connect to the lead(s) that only shows (-) ground when any
door is open. If you're installing an alarm in a vehicle that does not
have a common door trigger lead, you will need to
connect two or more together using blocking diodes. (diagram)
Door Trigger (+) Input
Connect to the lead(s) that only shows (+) positive 12 VDC when any
door is open. If you're installing an alarm in a vehicle that does not
have a common door trigger lead, you will need to
connect two or more together
using blocking diodes. (diagram)
Hood / Trunk (-) Input
Connect to a lead or switch that provides ground (-) when hood/trunk
is opened. If positive (+) 12 VDC is present when hood/trunk is closed
on the same lead, use a blocking
diode with the cathode towards the switch.
 Sensor(s)
(-) Input
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 lead of each sensor.
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Valet Switches
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 lead 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 lead to (+) 12 VDC. See your installation
manual for more info.
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