I have installed many many stereos, amps, caps and so on. I used to own a shop in Va. but never have I had the problem I am having now. I ran a Pioneer 7" flip out screen 2 10" Infinity Kappa Perfects and a 1200 watt California Profile amp. I read the ground nothing wrong there. Checked the voltage while running, at a low volume I have over 14 volts, turn the volume up not even to half and it drops to 4 volts. When it comes to wiring putting stuff together installing I have no problems but I am not the greatest with all electrical. Also does anyone know the stock amps on an alternator for an 03 TL-S. Also I had this same stuff in my 99 ford explorer with no problems.