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First your engine runs best at a certain temp inside so if you run your fan all the time you will not allow it to do so. Second you are wasting power and horse power via the alternator pushing 25+ amps all the time putting more load on the belt and then to the engine. But if you insist on a switch wire a ground to the switch then the switch to a relay on the control side of the relay under the hood where you wish. Then to a small fuse like 10 amps then to battery. This can be thin wire. Then run the 8 gauge from the battery to the 30 amp fuse then to the switched side of the same relay then to the fans. Then use large 12-10 or 8 gauge wire for ground too to make sure it has a good ground.
The general rule is 5 to 10% more then the item your running for fuse protection. The way I suggest puts the small amp power inside and the large draw fan power under the hood. This the way factory runs them to protect the passenger compartment from things like fire burning melting and so on. If you run the wiring idea mentioned above you still have the big hot wiring running inside up to the switch and defeats the purpose ground side or not.
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