Ignition sensing wire

The "ignition sensing wire" is the wire that connects to the alarm that shows +12v when the ignition circuit is energized via the key (to prevent the alarm from arming while driving, and in most cases allow you to put the system into valet mode and change programming options). As the diagram shows, yellow is the ignition input wire in this case. This diagram shows voltage being applied to the ignition wire of the vehicle when activated by the +12V trigger to pin 86 (labeled as Turbo Timer Ignition Wire Output). Using this diagram will disconnect the vehicles ignition wire from the key cylinder and provide power via the connection from pin 87 when the relay is activated. When the relay is not activated, the connection is restored to the key cylinder. From this diagram, it shows the output from the aftermarket system as being a + trigger that would hold power on a vehicle's ignition wire for as long as there is +12V being provided to pin 86. This method however will only provide power to one ignition circuit, with no power being provided to any accessory or second ignition circuit. The issue that may arise with this is that most vehicles now have at least 2 ignitions, and doing this method would require you to use several relays to power all of the required circuits for the vehicle to run. Just be sure to verify that you have the correct number of circuits being energized while the turbo timer is running. IMO...cutting the ignition wire from the key cylinder is not recommended. Although it is extremely rare, relays can go bad...if you have cut the ignition wire from the key cylinder and the relay does fail, you could lose power to the vehicle's ignition circuit while you are driving...just food for thought.