I just put a big ol system in my car with a second battery and a 2x powerfull alternator, and my traction controll randomly turns off. i noticed that my cruise controll doesnt work to and i think its connected to the traction problem. somtimes the cruise will work and sometimes the traction will be fine. it seems pretty random when the traction turns off but i feel like the second i crank my system and start pullin juice from the battery the traction turns off and wont turn back on. and rarley the service traction light will come on. when the traction doesnt work the cruise doesnt work. seems like maybe a bad ground or something. allso sounds like this is a some what common problem. (system is done right trust me on this one, big 3 with 1/0 guage ran throughout the whole car)