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Fan Wiring HarnessRelay12V40 amp RelayTerminals/FusesBe Cool/Spal amp Connection FansKitOur single fan wiring harnesses come complete with the proper gauge and color coordinated wire, a temperature sending unit, waterproof 40 Amp relay, and a 30 Amp fuse with fuse holder. Also included is a complete installation instruction booklet with �user friendly,� easy-to-follow detailed diagrams. A wide variety of applications are available for single or dual fans that are controlled by a temperature sending unit, or a toggle switch with a waterproof 40 amp relay.