Name this part ... Whereas I have not a clue..

upload_2018-2-12_10-23-25.png


Horn relay

See wiring diag and wire colors and wire colors on your harness
http://www.oldcarmanualproject.com/tOCMP/wiring/5765wiring diagrams/Plymouth/MWire5765-323.jpg
Violet and Dk Green and Black with a trace