Now you've confirmed that you have a ground fault in the fixture/wiring. You
have three choices: leave it disconnected and have no underwater light,
somehow get the stuck screw out and "try" to replace the lamp if bad and the
gasket(good luck) or spend a few hundred dollars and get an entire new
sealed unit
wrote in message
oups.com...
OK - I pulled off the top of the deck lamp junction box and isolated
the wires going directly to the underwater bulb (recall that turning it
on trips the GFI, which tests to be working correctly.

Between the two leads to the bulb (green and black) there is
continuity. Between each of the individual leads and the pool ground
(electrical junction box) there is also continuity. I think this is
expected from the green (ground) lead --- but I'm guessing the fact
that the black lamp lead is also grounded is what's causing the GFI to
trip.

Is this right?

What's the next step in repair? Pulling the wire to the niche and
replacing --- or is pulling the lamp housing up the surface for
inspection next?

Thanks for ideas?