Security light flashing and ignition doesnt work

Identify Components: Before starting, make sure you have the ignition switch and necessary wiring harness.

Disconnect Battery: Ensure the battery is disconnected to prevent any electrical accidents.

Locate Ignition Switch Wiring Diagram: Obtain a wiring diagram for the ignition switch and the Caterpillar 3116 engine. This will help you identify the correct wires to connect.

Mount Ignition Switch: Mount the ignition switch in a convenient and secure location within the vehicle.

Connect Wires: Using the wiring diagram, connect the wires from the ignition switch to the corresponding terminals on the Caterpillar 3116 engine. Typically, the ignition switch will have terminals labeled for various functions such as ignition, accessory, starter, and battery.

Test Connections: Once the wiring is completed, double-check all connections to ensure they are secure and correctly wired.

Reconnect Battery: Reconnect the vehicle's battery.

Test Ignition: Turn the ignition switch to the "ON" position and verify that electrical components such as lights, gauges, and accessories are functioning properly.

Start Engine: Attempt to start the engine and ensure that the starter engages and the engine cranks properly.

Final Checks: After successful installation, perform a final check of all connections and ensure that there are no loose wires or potential electrical hazards.

Hooked all wires up right??? Fuse is fine??? Somehow, I do not think this is the case. I wish I had a dollar for every time I have seen this happen....I would be a VERY rich man!

You do not need a dome lamp diagram. You need to replace Fuse #13 (10 Amp) in the Power Distribution Center in the engine compartment. This will make the power return to the PINK wire and get your dome lamps working.

The only way that the RED/WHITE wire is going to have power with the ignition switch off is if either the ignition switch is shorted to power or the RED/WHITE wire got hot enough to melt the insulation in the wire harness and short to another B+ wire. This wire is supposed to have power when the ignition switch is in the RUN and ACC positions. Make sure it is in the OFF position. If this wire still has power, then YES, you probably smoked the wiring harness. If this is the case, the dash should be removed so that full access to the wiring harness can be achieved, allowing a full inspection/repair of ALL of the damage (there are most likely several other wires in the harness that have also been damaged).

If it were the immobilizer, you would have a security light that would be flashing or staying on all the time the key is in on. Since the engine cranks over and the pump is working when you turn the key to on and start, the green light may just mean the bulb is burnt out or a connection problem with that wire for the light. Not much of a problem there.
You said no fuel or fire when trying to start-so that is where to concentrate: you first need to verify that the ignition still is working, so check for spark on a plug wire with the engine cranking over. This could be a main fuse or main relay not passing power on to the ignition system and/or the injector circuit. First check for spark, and if you have spark, check the injector circuit (there is a fuse for the injectors-probably under the hood in a fuse/relay block). If you have no spark, you will have to diagnose the ignition system- coils, ignition control module (the ignitor), the crank angle or crank position sensor, finally the engine computer.

You have a failed antitheft security system. The key is most likely the problem. That little chip tends to wear down. It could also be a few other things. Since the light is flashing, it will either be the key or ignition lock cylinder. If it wear solid, then it would be the TDM (Theft Deterrent Module) which is the brain of the security system. Try rplacing the key. if that doesnt work you have 2 choices. Replace the ignition or bypass the security. There are 2 ways to bypass your car. BOTH will work for you. Ive done it. This link will help you understand the system and guide you with pictures and those 2 other links. Any questions, comment back on THIS post. Im good with BUICKS and always willing to help. Thanks for using FixYa

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Yes, the security system shuts power to the starter and fuel pump. You can try disarming by unlocking and locking the doors the power door locks switch (depends on model). Place the key in the ignition and set to ON, ALL doors closed!! Cycle the locks using the power locks button on the driver's door "lock" then "unlock" if this doesnt work, try same method with the ignition OFF. Otherwise your security system is malf.

the ignition swith reads the key chip when key is turned, this is a common problem,the ignition switch will need to be replaced, after replacing the swith reprograming will be needed, to program you will need a battery charger to keep battery from going dead, after installing new switch,turn charger on, turn key to crank then release key leaving ignition on, you will see the dash lights, leave key on for about 15-20 min, until you see theft light go out, if light doesnt go out then repeat process,crank for 2 sec, then leave key on 15-20 mins until security/theft light goes out, hope this helps.

there may be a broken wire from the ignition swith going down the steering column,theres two sensors at the begining opening of switch, sometimes they get stuck and dont pop back out, in turn it doesnt touch the chip on the key and cant read it,take a look with a light use a small pic and push lightly on them and see if the y push in and pop out, if they do then replace ignition swith,theres a way to bypass,use an omh meter and measure resistance of key chip, then buy a resistor with the same value,and connenet to wires from switch under the dash,cut wires and put conecting the two going to switch with resistor connecting them together,heres a diagram,

try another key. if this doesnt work the wire in the tumbler assembly most likely broke and you will need it replaced. ( Ignition Switch)

Replace ignition lock cylinder. The wires have broken that go to it.

The security light is staying on because 1 of 2 things, both of which relate to the vehicles VATS (vehicle ani-theft system). You know that little black bump in your key? Well thats part of the VATS system. There is a connection in the ignition that reads the resistance of the pellet. If its not the right one, the security light disables the ignition and starter for 3-5 mins. Now either the wiring is loose on the inside of the ignition switch, or the metal contacts of the key is dirty. Try cleaning the key off with some rubbing alcohol and try again. Or better yet, if you have a spare key that gets used less often, try that one. If that dosent work, its time for a new ignition