Coat the tip of your soldering iron with new rosin core solder.

Heat the wire and coat the exposed pickup wire with a small amount of solder - thus "Tinning" the wire.

Melt the solder that is still on the selector switch terminal and quickly remove the excess solder from the terminal. Wrap the tinned wire around the terminal to make a good mechanical connection, before you solder.

Press the tip of the soldering iron onto the pickup wire and terminal. Add a little solder, until the solder melts and molds around the wire and terminal. Don't add too much solder (Solder Blob)!

Let the solder joint cool and become solid.

Lightly tug on the pickup wire to test the strength of the solder connection.

If the connection appears solid, reassemble the pickguard in reverse order.