Nissan Pathfinder Stock Amp Question

[IdahoPaul]

Need some help. My son's new (new to him) 94 Pathfinder has a drain on the battery constantly. I have narrowed it down to the two stereo amps that are mounted in the rear compartment. They appear to be the stock units, as we tested them. They are constantly on, (meaning pulling power from the battery) with the radio turned off. (I even pulled the radio fuse) They go off when I pull the radio AMP fuse, but that shouldn't have to be done daily. Anyone know what I am missing, is there a switch or relay I need to locate?We really want to leave the stereo and amps in place, the things work and the kid really doesn't really have unlimited funds.

Paul