N2 power drain, suggestions?

[SigForLife]

Ok, per my previous post, I have determined since installing an N2 in my mother's car, it is draining the battery at a very fast rate (over night or within a day and a half). The battery is only several months old and is a Odyssey deep cycle, so it is a high end battery. Moreover, the N2 was in my father's truck and he had the same problem of battery drain, although we believed it to be from a different source (He got an N3 and we swapped it out, and he hasn't had probs with the N3). Thus I am looking for suggestions of where to look for such a huge drain. I won't be able to check the car until this weekend, but I figure I will check the remote turn on (to the amp) to make sure it isn't constantly powered. The care has a power antenna, but I don't believe it is powering it 24/7 because when the vehicle is turned on, the antenna goes up and when turned off, goes down. Given this problem has *seemed* to go with the unit, I don't believe it to be a wiring issue, thus are there any other wires coming out of the N2 (Radio unit and brain) that I should check whether they are powered when the unit is off (aka wires that have power when off that shouldn't)? Just as an FYI, I have done the bypass by using the circuit writer pen, but I can't see how that would cause this prob and was only done after taking it out of my father's truck. Thanks!