I don't know if the Ramchargers fan is the same one available elsewhere now. I bought the Ramchargers fan last year with the adapter they sold. The adapter, IMO, is the reason everyone is wiring them differently. It was wired to run both fans on high regardless of which relay closed. This method caused the wires to get hot. I rewired the adapter to run the fans on high and low just like the factory fan using the factory harness, and therefore the factory relays and delay. The only significant addition I made was to add a direct ground because the single ground wire would get warm when the fans were on high. IMO, if the adapter originally came wired the way I made mine, then there would never have been a need for all these fancy harnesses.