How to hook up C wire to Crown air handler
Get a scrap bit of wire, that's the same thickness as the other wires.
Disconnect the wire that is currently in the C terminal.
Strip both ends of the scrap piece of wire.
Connect one end of the scrap piece of wire to the C terminal.
Using a twist-on wire connector (or other connector), connect the wire that was previously connected to the C terminal with the new C wire, and the other end of the scrap bit of wire.


When finished, the two C wires should be connected together, along with the wire that's connected to the C terminal.

This type of connection is known as a "pigtail".