There should be at least 2, sometimes 4 speaker leads coming off the LOC, hook these up to the rear speaker wires or front but rear is easier. Then there should be an accessory wire coming off the LOC hook this up to an accessory wire in the car. Then there should be a ground wire coming off The LOC hook this up to ground.
Depending on which LOC you get, you sometimes get a remote turn on lead output of it so that is one less thing you have to worry about.
-Steven-