@Art Lites posted:
... Using the Menards connectors which I will cut at one end, Which wire is positive and which is negative.
Not clear when you say "cut at one end" if you mean the connector on the building or the connector on the transformer. In any case, there are screw-terminal adapters that fit the coaxial-barrel connector used in Menards buildings. Male and female versions. From my understanding of what you have and are trying to do this would mean you wouldn't have to cut into any power cords. Of course the biggest "problem" with this is if you only need 1 of these screw-terminal adapters you end up paying way more for shipping than the adapter itself! Frustrating!