Better wiring diagram

My 69 Satellite has an electrical problem. The brake lights do not work. The tail lights and turn signals work fine. There is no power to the brake switch. Upon checking the fuses, I found the fuse is blown. The second I put in a new fuse, it blows. I disconnected the brake switch and it still blows. This same fuse powers the interior lighting and I am not sure what else. I have a 69 Plymouth service manual but it does not show me the fuse block or where the wire that feeds the brake and lighting circuit split off so I can start eliminating circuits to chase the fault down. Before I dig deep under the dash, I would like to have a better diagram to follow. Does someone know of a site to download a better diagram or point me to the area where the power for this comes together. Can somebody tell me what else this fuse protects besides brake lights and interior lighting.
Any "leads" will be appreciated.
Author: fivepoint