I have an outdoor light that doesn't work because the contractor did not correctly wire up neutral line. The hot and ground are correctly wired but the neutral is not. My DMM didn't show a voltage when I measure hot and neutral. The house is built and it would be a pain in the *** to tear up the wall, find the wire and re-wire it. Since the ground wire is connected to the neutral wire at the breaker, what if I just connect the light's neutral to the incoming ground wire? Is this a significant hazard? I did try it and the light worked. Also, I measured 90VAC between ground and neutral. Is this indicative if a bad grounding connection?