Step 18: The Banana Connectors
Anyways, solder a wire comming from the diode on the SPDT relay to the banana jack. This is going to be the positive connection.
Now do exactly the same but this time use the second wire on the barrel connector, the one that has two wires comming from the negative tab. This is going to be the negative connection for the output.
Re-assemble your banana connectors and place them in your enclosure.