Cant figure out what's going on. 2001 Ford zx3 automatic. Battery is new. I try to turn my car on, turn the key and... nothing. When doing that it messes with my radio. I realized that when driving my radio flickers on and off.

Red light flashing above the stereo indicates the security system needs to be bypassed. Look for a little button under the dash possibly by the OBDII port or on the right hand side of the steering column. Look hard for it, it will literally be a small button kinda taped up. Once located, press and hold and turn the key to start the car.