Voltage from Neutral to ground

[solis]

During a retrofit of lights in a parking structure, we were replacing the existing 250W HPS lamp and ballast with a direct wire LED. Voltage is 277V. Everything worked, but we were getting 80V from neutral to ground. I thought we had a loose neutral in a multi-wire circuit. Old building, lots of band aids in the electrical system over 50 years. Was I on the right track? Other conditions that would put potential between neutral and ground? It was measured between wirenutted neutrals and ground screw at a couple of locations. No arcing anywhere.
Thanks

 

[ActionDave]

Could just be your meter if you don't have a lo z setting. Old parking lot lights are notorious for poor or missing equipment grounds. You could merger the circuit if you want to be dead sure.

 

[ptonsparky]

Could just be your meter if you don't have a lo z setting. Old parking lot lights are notorious for poor or missing equipment grounds. You could merger the circuit if you want to be dead sure.

Merger is good, megger may be better.