67Dart273 said

That wire sure as hell does not look red in the photo. Is this from the engine bay, or under the dash?

There are only a couple of plugs like that from under the dash. EDIT: Brake switch connector is male so not it) One is the emergency brake warning switch, one is the cig. lighter. All you have to do is LOOK. LOOK at the schematics labeled "instrument panel" and look for a connector shaped like that.

Lighter is no. 16 red wire

ALSO FROM MYMOPAR download the 73, that is right, the 73 manual. Go, for example, to page 8-168. Once you learn how to use this, that page is the start of the pictorials of most/ all of the connectors for under the dash (CI-X stands for "Connector, Instrument)

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