Help! Slow Battery Discharge

My 65 Valiant has a slow battery discharge. Usually goes dead in 2 weeks. I have put up with it for 6 years and finally I'm ready to fix it. I need more frustration in my life like I need a tax hike. There is an aftermarket MSD 6AL and a MSD retard box. I'm not sure where to start. Removed the battery disconnect at the neg terminal a year ago because the thing doesn't always work. Is there any simple way to trace the slow draw to the guilty device.
Thanks A-Body Members:banghead: