Grand Prix Battery Drain
 

I have a Grand Prix that I'm trying to fix for someone. The battery will drain in about three days. The alternator is new and has been checked same with battery. Through some trouble shooting I've found that if I remove the head light switch the problem stops. I got a switch from the junk yard and it did not fix the problem. The interior lights do not work I've removed all the bulbs that I can find. has anybody experenced this? Any help would be appreciated.
Larry