How can I keep the horn from honking when jumping car ? 1998 Deville

What is your question?

I am attempting to jump the car using a charger. When I connect the negative clamp to a non painted bolt on the car the horn starts honking. Will it stop after a few honks or is there another method I need to employ? The car sets for long periods of time with out being started. 130,000 ish miles on it. Last time I drove it, (a month of so ago) it drove fine. It has been below freezing in our area a bit and I guess I need to start it and let it run or drive it more often.