Yeah, you should be using the relays to power the fans. You use your switch to turn the relay off or on and it's very low load on your switch and wiring. All the power goes through the relay to the fans and it's the correct gauge for it. If you're using 18-20 gauge wire from the battery to your switch to the fan theny you're overloading that wire big time and it could cause a fire. You can get a relay at the parts store pretty cheap and then get some 14-16 gauge wire to run from the battery to the relay and to the fan. Then you wire your switch to the relay. I had to do that with fog lights on my 4Runner.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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