Security system/battery Battery was going dead. During replacement with new battery, the horn started honking non-stop. disconnected, removed horn fuse, car wouldn't start. No power at all. Put horn fuse back in, still no power at all. Thoughts?

It is a known issue. Lots of ideas, mine is a to call out an auto-electrician with a pro-grade scan tool computer. When the battery is disconnected, and the key is in the ignition and the doors are closed, the horn shouldn't go off. Make sure you leave the windows open in case it self locks. After that, you need to do a security reset. There are 3 ways here.

https://www.google.com/search?q=1999+dodge+ram+1500+security+reset

https://www.google.com/search?q=1999+Dodge+Ram+1500.+How+to+make+the+horn+stop+going+off+constantly

Is it possible that the panic button is stuck on the Remote?
..

First I'm not a Dodge mechanic.
* Check your warranty. Call for setrvice.
*** following is for information only.***
* horn switch is stuck. See if you can pry it back up.
* For multiple horn switches (both sides of steering wheel) check both switches for "mushy operation" or stuck in one position.
* Horn RELAY not working (all makes); https://www.youtube.com/watch?v=76xR7QGPF1M
* The drained battery is probably due to a short in the electrical system
* Pull the "Horn" fuse to stop the horn (or pull out the horn wire to the horn itself. Leave it disconnected until you can confirm the bad switch or a short in another part of the system.
* Horn Clockspring (diagram) ; https://www.youtube.com/watch?v=K0TTRbBjv-U
* Horn not working (Transmission changed); https://www.youtube.com/watch?v=ZdbMOhYjr0c
* Charger Alarm and Horn issue; https://www.youtube.com/watch?v=l6eD2RIkuXo

Aloha, ukeboy57

That is most likely in your security system. It needs reset.

First use a battery charger to charge the battery, instead of a jump start. Second, with a complete dead battery you may want to pull the connection for the horn under the hood till the battery is completely charged.

hook it up and wait a min or 2 for it to stop or disarm the alarm after but i think it will stop after 1 or 2 mins

when the horn starts to honk just put the key in the ignition and turn the car to on, you can also use the key to lock and unlock the drivers door, you are activating the security system by disconnecting the battery doing the above disarms it, if it still won't disarm then you need to see the dealer on this problem

yes their is a factory immobilisor and a dead battery can upset it quite easily ,sorry but as its the antitheft then its a dealer only job

Try disconnecting the battery for 5 minutes. then when you reconnect the battery lock and unlock the drivers door with the key, door closed. this will on some models deactivate the anti theft system. but it must be done with the hood closed and all the doors closed and from outside with the key. mike