Hojack--
On the new plug, the wide blade will want to connect to the identified conductor. Identified conductor? The one that is different. By having 3 raised fins molded into the insulation parallel to the cable, on the outer edge of one of the two wires. They are small and hard to see.
RJR-- Glad to see you are still holding the fort. I've been away for many moons.
--Frank