[B]Need To:[/B] Update two-prong outlets to three-prongs, house built in the 60s. [B]Background:[/B] Electrical panel, meter and wiring from the outside of the house to the city connection was recently replaced/upgraded by qualified electricians. A grounding rod was also put into the ground. We purchased all-new appliances and needed a larger box to properly accommodate them and pass inspection. [B]Questions:[/B] I'm a novice when it comes to wiring. There are currently only three or four installed three-prong outlets in the entire house. I want to update all of the two-prongs to three-prongs. I've used a multimeter to test for ground on a number of outlets, some show ground and others don't. What's the "correct" way to go about testing and updating all of the outlets?

I have this older receptacle in the kitchen near the sink that isn't GFCI and I wanted to replace it with one, when I tried I couldn't figure out what wire to put where since there's 2 live wires (red and white marked with black electrical tape) and one neutral. The red and neutral come from the same wire (12/3) and the white marked with black electrical tape is from another wire. The black wire from the 12/3 is wire-nutted to other black wiresThat receptacle must power another one, which I swapped out for a GFCI with no problem. [ATTACH]54489[/ATTACH][ATTACH]54490[/ATTACH]