hahah new used car fun. Please help identifying relay and plugs

You have a shop manual?

You can download a complete factory 70 Plymouth (use Valiant diagrams) from MyMopar:

http://www.mymopar.com/index.php?pid=109

The link:

http://www.mymopar.com/downloads/servicemanuals/1970_Plymouth_Service_Manual.zip

or a "Dart Challenger" manual thanks to AbodyJoe

[ame="http://www.abodyjoe.com/pictures/Misc.%20car%20info/70%20Dart%20Challenger%20Serv%20Man1.pdf"]http://www.abodyjoe.com/pictures/Misc.%20car%20info/70%20Dart%20Challenger%20Serv%20Man1.pdf[/ame]

Forgot to add the diagrams from "MyMopar" Sometimes easier to follow, sometimes incomplete

http://www.mymopar.com/downloads/1970/70DartA.JPG

http://www.mymopar.com/downloads/1970/70DartB.JPG