Horn started blowing, lights stared flashing

Hello,

This is probably a problem with your vehicle's Vehicle Theft Security System (VTSS). I have included component location and diagnostic troubleshooting guide for your vehicle's VTSS system in the diagrams down below. The guide does require the use of a Chrysler computer to perform, but it also requires the use of a test light. I have included a link below if you are unfamiliar with how to use a test light.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go through the guides and get back to us with what you are able to find out please.

Thanks,
Alex
2CarPros

Hi SCWICKEDSTANG. I typed this a few hours ago but was unable to post it. Add this to your reply, then continue on. I'll come back if you need me.

Yes, that's the place to start. Low system voltage, meaning a less-than-a-fully-charged battery can trick the anti-theft system into sounding. It happened to my '93 Dynasty after I let it sit too long and the battery ran down.

13.2 volts is too low. Charging voltage must be between 13.75 and 14.75 volts. The better test now is the "full-load output current test", but you need a professional load tester for that. Just about every independent repair shop has one. Besides full-load output current, we want to know if "ripple voltage" is high or low. Ripple voltage is a secondary indication whether the alternator has a defective diode. When one of the six diodes is defective, the most current you'll be able to get from the alternator is exactly one third of its rated maximum current. That is not enough to meet the demands of the entire electrical system under all conditions. The battery will have to make up the difference as it slowly runs down over days or weeks.