I just installed a Sundown Audio SAE 2000d in my car today.. Have the power, ground, and remote wire hooked up. Only the green “power” light on top of the amp stays on. When I put the keys in the ignition and start the car, I hear the amp click (I guess meaning it has power). But when I turn the car off, I hear that same click (I guess meaning that it’s off). Why does that green power light stay on?