How to wire a GFCI next to an adjoining switch

[deepdave]

I am replacing a standard two plug outlet with a GFCI two plug outlet in the kitchen. On the current receptacle there is one white wire at the top on the right near the ground and two black wires on the bottom left. I assume that one of the black wires is the hot line from the breaker. The other black wire goes through an on off switch which controls the overhead fluorescent. When installing the GFCI can I move both black wires to the 'line' side? Or do I have to determine which of the black wires is from the breaker, move it to the GFCI line side and attach the other black wire for the fluorescent light to the load side (even though it won't have a matching white wire on the load side). THANKS

 

[Megawatt]

I am replacing a standard two plug outlet with a GFCI two plug outlet in the kitchen. On the current receptacle there is one white wire at the top on the right near the ground and two black wires on the bottom left. I assume that one of the black wires is the hot line from the breaker. The other black wire goes through an on off switch which controls the overhead fluorescent. When installing the GFCI can I move both black wires to the 'line' side? Or do I have to determine which of the black wires is from the breaker, move it to the GFCI line side and attach the other black wire for the fluorescent light to the load side (even though it won't have a matching white wire on the load side). THANKS

You are correct but find the cable that is live both the black and white then it hooks to the line side of the GFCI receptacle. Every other cable goes to the load side. Hope that helps and good luck. Please after you identify the live cable turn off the power.