73 dart swinger heater wiring

anyone have an idea what harness and wires are the ones for the factory heater controls, , the blower isn't working, and wanted to trace the power sources to what fuse area, I can see all good fuses, so? factory heat/ac car.. any ideas the core assy removed to be replaced, and reinstalled and plugged in no worky? wanted to check power and grounds but no idea where, too, manual doesn't show the heater or a/c wiring on wiring diagram I have...