Why not cook marshmallows on my under dash fire?

DK,
Here are some wire diagrams that might help sort out what is what under the hood if they did not change that out.
http://www.mymopar.com/downloads/1970/70DartA.JPG
http://www.mymopar.com/downloads/1970/70DartB.JPG
Here is the 73 stuff looks like that is what is on the column in the pic. Colors match up 72--76
http://www.mymopar.com/downloads/1973/73DartA.jpg
http://www.mymopar.com/downloads/1973/73DartB.jpg