As most of you know my stang crapped out due to dead battery. I searched everything, but aside from it being a factory problem, I found something else. If you have a proximity sensor installed (radar that detects people putting there hands in the car, I have a vert), It draws a bit of voltage, and within 4-5 days the battery will be dead. I have rewired it now, so that the prox. only activates if my top is down. I did something similar with my trunk release button I installed. Now that only works when the e-brake is pulled. Many know that on the s197 there isn't a trunk release button, you have to use the key or the fob. Hope this helps, if not, tough titties. And I am getting rid of my stock 17" wheels and tires if anyone is interested.