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I definitely recommend use of relay(s). Like any electric motor, start-up amperage is higher than when running, especially if you have dual fans (some do). Standard switches are easily over-taxed.
I recommend you go to web site MAD ENTERPRISES Po Box 675, Springville CA 93265 (559) 539-7128 .... good and detailed info posted there .... phone and discuss the issue with them - very helpful. I bought my headlight, fog light and fan relay kits there.