'74 Dart Sport Wiring Diagram Problem--HELP!!!

Okay, so the man who sold me my car had a wiring short. He told me the car had no issues and no accidents. I decided to take the motor out, so I could paint the engine compartment. I decided while I was at it to check the wiring. Engine compartment wiring seems to be okay but under the dash it has a short that goes to the directional flasher and to the blower motor switch. I can't tell if the blower motor wire or the flasher caused the problem because the plug is not melted. Just the wiring is melted.

Does anyone know of any problems these cars may have had with the blower motor switch or the directional flasher? I have a wiring diagram off the internet, but it doesn't seem to be complete. Does anyone have one for a 74 Dodge Dart Sport?

Thanks in advance,

Pete