that's what my damn horn does every time i turn the truck on. started doing it like 2 or 3 months ago. it burned through one battery after like a month, so i eventually just took out the fuse. no more problem, but now i also don't have a horn to blow at the worse drivers i've ever encountered in my 5 years of driving! oh, and my tailights keep burning out, anyone.....bueller, bueller?