fusible links?
Wiring diagrams for a 74 Dart and Valiant show only one fusible link in the system. Understand that all of the accesories run off of power that goes through the ignition switch. Follow Redfish's advice and start at the ignition switch and follow the power. If you do not do it systematically you will drive yourself bonkers.
www.MyMopar.com has a section devoted to electrical diagrams. If you do not have one in your manual go there and use the Valiant one as a guide.