Want to wire up an electric cooling fan in your car or truck? This complete 40 AMP relay kit makes it way easier. It comes with everything you need: a waterproof 40A relay with a wiring harness, a 3/8-inch NPT thermostat switch (turns the fan on at 185°F and off at 175°F), a 3/8 to 1/2 inch adapter, an inline fuse holder with a 20A fuse, ring terminals, wire connectors, and a clear wiring diagram. The 14 AWG tinned copper wires are durable, and the whole setup is designed for 12V systems. It fits most popular engines from GM, Ford, and Mopar (think small blocks, big blocks, you name it) and works with 10 to 16-inch fans. Just hook up the wires as shown — red to battery positive, coffee to fan positive, black to ignition, grey to the sending unit — and make sure the thermostat is grounded through the engine threads. A word of advice: if you're running high-amperage fans, you might need heavier gauge wires. This kit is a clean, reliable way to get your electric fan running automatically based on engine temp.
Free 30-day returns 
Free 30-day returns
