I have an outlet and switch in same box. The box has 4 sets of wires- power source, light, and two others. The switch controls a light. When I replaced the outlet with a GFCI, everything worked expect that the switch was turning the GFCI on and off. The GFCI was wired without the load out- just line in. All the wires were pig tailed. I believe I need to identify the set of wires that goes to the light to rewire the GFCI, but am not sure how to do this.