Connect one wire (labeled (-) ground) to a clean & solid vehicle ground.
Connect the other to a constant (+) 12 VDC source
inside the vehicle, do not connect at the battery.
These may also have internal impact/motion
sensors and may work fine on some older vehicles, and some are better than
others, but I would recommend that you stay away from them. Two wire &
many all in one systems rely on current sensing to trigger them and are
prone to false alarms on most of today's vehicles, especially General Motors.
Some due have additional connections and can be hard wired. Some offer
many features. But the engine compartment isn't the best place for electronics
anyway, especially if you can help it. And more times than not, finding an
adequate location to mount a small siren can be a small job of it's own.
For the small difference in price, if any, it's worth stepping up to a
more popular component type system.
Keyless Entry Upgrade to an Alarm
Upgrading a factory Remote Keyless Entry to an alarm system
Upgrading the factory RKE (remote keyless entry) to an alarm system
usually consist of 3 more connections, 4 if you plan to inhibit the trunk/hatch
pin when opened by remote, than a basic alarm without
keyless entry. Some vehicles may require additional connections and parts.
If the driver's door unlocks on the first press of unlock on the transmitter,
and the others unlock on the second press;
First locate the motor leg wire of the driver's door lock actuator
that shows (+) 12 VDC while unlocking. Connect this wire to the"disarm
#1" wire of the alarm.
Next locate the motor leg wire of any other door lock actuator that
shows (+) 12 VDC while unlocking during the second press of the button.
Connect this wire to the "disarm #2" wire of the alarm.
Now locate any motor leg wire that shows (+) 12 VDC when the doors are
locking. Conect this to the "arm" wire of the alarm.
If you intend to inhibit the trunk/hatch release during remote opening,
locate the wire that shows (+) 12 VDC while opening. Connect this to the
(+) positive inhibit wire of the alarm.
Note: some alarm upgrade modules may require (-) negative inputs instead
of (+) positive. If this is the case you will probably need to add relays
since most RKE's do not switch ground to the actuators / motors. Check
your installation manual first.