Usb 9 Pin Connector Wiring Diagram. Plus their pinouts have a different arrangement. Plug from a general purpose scart interconnector cable.
If the signalink is attached to your radios 8 pin accessory port then please see the diagram below under 8 pin din accessory port connector. It covers wiring for the common db9 plug and socket often used with can bus test equipment. Turns out that pin 13 is an ignition feed that has 12 volt positive when the ignition switch is on.
Rough sketch diagram will work step4.
Please dont chop off the factory pin connector to hard wire the. All sparkfun products use a negative 55mm. It covers wiring for the common db9 plug and socket often used with can bus test equipment. 5v is supplied to ttl bus and 33v is supplied to microcontrollers 5 pin port and 4 pin communication port.