Cranks but won't start. Unplug ground at field spade on Alternator and it starts?

With the new Unilite, it seems possible its power needs are more picky than your old one.

I've not worked with them, so all I know is what I've read in the instructions and things like that.
Its possible there is either internally different than your old one, or something about the wiring is reducing the power it needs to run during start.