By blinker chime, are you saying the one that comes on to remind you that you have the blinker on?? Are you one of those people who drive for 20 miles on the highway with your turn signal on?? I can say that I have only heard my chime once, and it kind of startled me, as I wasn't sure what the problem was... Looked down to check my idiot lights and saw it was on. I think the signal has to be n for 90 seconds or so though...
You must have a lot of traffic lights in your area that have you sitting in a turn lane for super extended periods of time.. As fo disabling it, I think it is the same chime that sounds when you shut off the vehicle and try to exit with the headlights on. Turn off the ST, leave the lights on and follow your ears to the chiming module. Unplug it and that should take care of it I would think...