Hi, I have bought a new house which is 1970's with gyprock walls. I have a very heavy framed picture to hang, and my stud finder indicates there are electrics all the way along the wall. Could this be the aircon? It's just an internal wall between the bedroom and the loungeroom. I successfully hung another heavy picture on another wall by finding and drilling into the stud, but this one shows electric on the whole wall. Thoughts? I'm a complete novice, so please be kind.