Hello, New to the site. I recently purchased a 71 chevelle. about 3 weeks back my horns started going off all on there own,I was in the house. no one in or near the car. Now when I open the door the dome light is dim,pull the head light switch it goes more dim. no headlights,power to anything at all. Will not crank,etc. previous owner attempted 1 wire alt set up and was done incorrectly.I have removed the engine harness to check all wires. It is in really good condition, not chopped up. Ign switch maybe?