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Hello, does this vehicle have an aftermarket alarm installed? It would be under the steering wheel in a square black box.
Have you owned this vehicle since new?
The factory anti theft system in this vehicle won't honk the horn by hooking up a battery charger. Unless something is haywire. This is a sign of aftermarket equipment. If you have owned the vehicle since new it can be a couple things. One is the battery cables can be oxidized and wore out. This is just something that happens over time and new cables would correct the concern. Another thing is the vehicle starter could have gone bad. If this was to happen lights would come on like normal but when you try and start it they can go very dim.
Yes I am. I am also assisting others besides you. An audible theft alarm like a siren?
The factory alarm system only uses the horn for anything audible. If you have a loud Siren noise this isn't from the factory.