How do I reset the security alarm on a 300 m Chrysler the engine will not turn over

This explains the issue

https://www.google.com/search?q=2005+chrysler+300+lightning+bolt+on+dash


you can also try resetting the security system as well


https://www.google.com/search?q=2005+chrysler+300+security+reset

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Try the auto manufacturers 30 minute security reset.

Search "chrysler security reset" for instructions.

Have you tried putting the key into the ignition switch and starting the car ?

In some vehicles, you can place key into driver door cylinder and manually lock / unlock which may turn horn off.

This may be accompanied with the power door locks not working also. You may be able to reset it by pulling the fuses in the underhood fuse relay center. The fuse or fuses that may reset the system are sitting in special holders in the relay center that have little clips on the side.They will look different from the other fuses as they have their own little holders. Pull them up and reseat them. Hope this helps

sound like run battery down your water pump on the 300M driven by the timing chain.could have disturb timing.

Check the fuses first. Especially, look for a fuse for the starter or starter solenoid or just solenoid. If the fuses are all fine, make sure that the security system is being properly disarmed. i.e. are the batteries in the remote dead? is the key dirty or otherwise malfunctioning? if the alarm seems to be disarming properly, then it's time to troubleshoot the starter motor....

try this,after locking/unlocking with key,put key in ignition,turn it on to start/release then, whilst the key is still in,press the alarm button.if i remember right,this should do it....

Do you have instructions on how to reset theft alarm?

lock the doors from the switch with the door open. That turns the included factory alarm on.

You are correct on the security light, it is the VTA (vehicle theft alarm). I am at a loss for the culprit part though, and their are so many diagnostic tests that could be run.
Even a malfunction in the key FOB could cause it. If you have another key FOB try using that one to arm and disarm the alarm after making sure the hood, trunk, and all doors are securely closed.
If that doesn't work you may want to try to obtain an OBDII scanner and see if it comes up with anything to help narrow the problem down.