Alternator light come on last night. Now car isnt getting power from batt?

I put fully charged battery in just to check if got power. When id connect neg cable horn would blow and all interior lights were blinking then i started to smell wires getting hot so unhooked battery and scared to hook back up.

The anti theft system was going off, which caused the horn to blow and lights to blink. With a proper key and / or remote, this can be disabled. I don't know what to say about wires that smell hot. Start by deactivating the alarm when the battery is hooked up and move forward from there.