a good way I found to test the GFI without a ground is use an induction tester like the ol' wiggy .. hot to hot then the negative lead to any nearby grounded reference like the sink faucet, it always tripped the GFI ..

neat story, I was under a house once and came up against a box that had the same color for their two wire circuit . before slithering out from under the house to get a cord I thought, hmm .. I'm laying on Ground .. so I grabbed my large screw driver jammed it into the dirt, got my tester used the screw driver as my negative reference and was able to correctly determine the correct hot wire.. that was cool. ..")

Last edited by MarkC10; 10/06/13 08:25 PM.

Anyone claiming to know everything about Electrical, is wrong.