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Surely there were nonswap-related snags as well. The original fan controller became inconsistent, so Norris applied relays to make it work properly. He went from a stand-alone controller, with its own temperature probe and only one relay, to this three-relay setup with the FAST XFI and Vintage Air A/C switch to control the fans. The middle and righthand relays are for each fan. This way, there is not so much amperage going through one relay and both fans, especially when the fans engage on start-up. Originally, the relay on the left used to turn on the fans when the A/C was engaged. This relay actuates it when the A/C compressor sees the voltage to turn it on and supplies a ground for the other two relays.