Hey Tim,
Can I hook up a GFI outlet to an old two wire system?
Russ
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Not successfully. You need to introduce a good ground wire into the electrical box. A GFCI *needs* a solid ground wire in addition to thw white neutral wire and the black line feed wire. The GFCI has internal components that measure the resistance between the actual ground wire and the neutral. If your body starts to act as a ground wire, then the GFCI senses this and shuts down. Always remember that the white neutral wire is not the same thing as a true ground wire. They are vastly different from one another.
Tim Carter
www.askthebuilder.com
W3ATB