delco wiring diagram?

http://www.tehnomagazin.com/Auto-radio-car-connector/DELCO-Car-Radio-Wiring-Connector.htm

http://www.installdr.com/QuickWiring.asp

http://www.autos.com/aftermarket-parts/understanding-the-wiring-color-codes-for-delco-car-radio-units-and-accessories

More
February 2015

This might help...

https://en.wikipedia.org/wiki/Connectors_for_car_audio

ISO 10487
February 2015

What - the insides of it?

Most unusual
February 2015