Seth Lovers are humbuckers, right?
According to the S-D website they either come with 2 conductors or four, plus a bare or shield wire.
It sounds like you've got the two-wire ones.
The blue (in your case, usually bare) or third wire is the ground for the metal cover. It can pick up interference from flourescent lights etc. The blue or bare wire ground the cover an gets soldered directly to the back of a pot, never to a switch or pot lug.
The hot (black in your case) and ground (green in your case) get soldered in just like a regular Tele pickup.
OTOH if you've got the four wire ones, black is hot, green is ground. The red and white get soldered to each other. You can either insulate the joined ends with heat shrink (best) or electrical tape (adequate but may eventually come off), or you can wire the joined together pair to a push-pull for coil splitting.
Bear in mind S-D pickups are often wound in the opposite direction to Fender, maybe other, pickups. If you get a weak sound in a both pickups position, it means the pickups are out of phase and you will need to reverse the connections on one of the pickups.