Don, try SPAL USA (http://spalusa.com/)
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Fan Accessory
Part Number: FRH
Description: Fan Harness W/Relay
Retail Price: $39.95

-Our relay wiring kits are a must-have when installing an electric fan
-Designed to safely integrate with OEM wiring
-Waterproof 30/40 Amp relay
-Printed wires (for ease of installation)
-3/8" NPT (National Thread Pipe) stainless steel sensor
-Optional switched override capability
-Kits available with or without a sensor
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jc