I am replacing a receptacle (rec) in the kitchen by a GFCI. The receptacle (I think strangely) is controlled by a switch (light) on the exhaust hub (where there is also a fan switch). When I took the rec off I found three lines coming out of the box. I forgot exactly where these were connected. Here is a diagram of the box wires:
When I switch the breaker back on the pair C gives me voltage only A and B not. Should I connect "C to line and A and B to load? A has grounding wire with it. It looks a new pair black and white are distinguishable, unlike B and C that have old indistinguishable rubber and cloth coating. The triple wires A are I think connected to the exhaust light switch (I am thinking that because these are new wires...) I actually do not like the idea of this particular receptacle being controlled by the adjacent exhaust hub light switch, so I connected B and C to GFCI (without checking which was line etc) and did not connect A, except its ground wire. The GFCI just had that little green light on, but the receptacles did not seem to have had electricity. So, now I want to do it properly.