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After going to the track last night I decided that I want to install a switch to manually turn on the electric fans whenever I want to keep the engine cooler. I have done some research and have found that there are 3 12AGW wires going to the fans. These are Blue, Gray, and Black. Blue controls the power to the first fan, Gray controls power to the second fan, and Black is the universal ground. I found a wiring diagram that stated to use a 30A relay for each fan and have the switch inside the car control the ground to the relay. The only problem I have with this is that it didnt specify which type of relay to use and wanted each fan wired on its own relay/circuit. I was wondering if I could just simply take the Blue and Gray wires and splice them together and just run them to a switch with a fuse inline. If so what size fuse should I use for this curcuit