So if you're installing electric cooling fans or upgrading your existing setup, this relay kit has everything you need for a professional installation. The 40 AMP rating handles most single or dual fan setups without overheating, and the included wiring harness makes connections straightforward. The thermostat turns fans on at 185°F and off at 175°F, which is that sweet spot for maintaining optimal engine temperature. The temperature sensor has 3/8 inch pipe threads with a 1/2 inch adapter included, so it fits most common mounting locations. What's great is how complete the kit is - you get the relay, harness, thermostat switch, adapter, inline fuse holder, fuses, and all the necessary connectors. The wiring diagram is actually readable too, which isn't always the case with automotive electrical parts. I've used this for several project cars now and it's been reliable every time. The 14 AWG wires work fine for most applications, but you can easily upgrade to thicker gauge if you're running high-amperage fans. The key is making sure the thermostat gets a good ground through the engine threads - once that's sorted, it works perfectly. If you're tired of engine temps creeping up in traffic or want better cooling efficiency, this kit makes the installation so much easier than piecing together individual components. Seriously, if you're doing any kind of cooling system work, having a proper relay setup is essential for both performance and safety. The quality feels solid, not like some cheap eBay specials that fail after a few months. It's become my go-to recommendation for anyone doing electric fan conversions.
Free 30-day returns 
Free 30-day returns
