found a factory amp in my car (infinity) only had the car for a week and just found it today. it's not hooked up??? aftermarket deck sony pos old as shiot.how could i hook it up and how much power does it push??? tia tia

i was told that if you unplug the amp even with an aftermarkt deck the speakers won't work. so i would assume that the speakers where rewired to the aftermarket deck to loose the amp