Help Identifying Wiring 70 Dart
I've posted this a zillion times. Please wander over to MyMopar and download yourself a factory manual, and a non factory wiring diagram, which in some cases can be easier to follow
http://www.mymopar.com/index.php?pid=31
Post a good photo of half the connector showing the shape, and list the wire colors
Off hand it looks like the diode for the headlamp/ buzzer/ ignition reminder circuitry. See if these colors match, from page 8-138 of the 70 Plymouth manual