At no point in time should your car be making any kind of noise while it is off. Your lights blinking on and off could be coming from a low battery or trying to pull too much power from your battery to your amp. Make sure your hot wire is connected properly. Do you have an in-line fuse block? If so, you should check and make sure the wires are still leading into it and tight. Is your amp bridged or not? For a start, go in and check all of your wires. Make sure that your amp doesn't still run when the car is off. If so, then it needs to be rewired. When your car is off, your amp should be off. It would be a lot easier if the car was here and I could look it over... Check that and if it still doesn't work, let me know and I'll go do some more looking on mine and try to help some more. One more question, what size and brand amp is it? and what are you trying to push with it?