Aftermarket Cd Player Messing With Me

[droppedlexus]

have a 93 gs300, I had a aftermarket cd player installed about 3 months ago, the installer hooked the cd player up to the factory amp...I came out yesterday turned the cd player on and it looked normal, but when I turned the lights on the radio dimmed a little. as soon as I hit the brake the cd player just shut off, when I took my foot off the brake it came back on, well now it's been doing it for almost a week....i also noticed that when I put on my turn signal the radio starts blinking in unisense with the turn signal?????????

[TurboGS300]

Check the ground, he probably used the illumination for ground or didn't ground it properly. <_<