OK now its my turn with a question, I`ve ran across a gas furnace (older Bard) that's about 20 years old. Someone removed the fan center that was in it for running a/c /ga heat changeover. Wire for wire how do I reinstall a new fan center,, it has 3 wires coming from the relay and 2 from the transformer,, with r-g-w-y-c,post on transformwe