Radiator Fan Electric Fan Relay Wiring Diagram – Electric vehicle fans and wiring On another page, we have done work with relays and individual horns. Now here is an introduction to electric cooling fans and how to connect them safely. It is mainly for cars that have not yet been connected, modified, racing cars, etc. If your car already has an electric fan, most of the work is done. The view above is a sample of several different styles of electric fans (some not to scale). The wiring diagrams for the fan will start from the simplest to the most complex so that you can easily move through them. Electric fan wiring This is the main focus of the page. Editing is left as an exercise for the reader (remember that from school!). You won’t need a lot of tools, but a good wire clamp and the usual tools in your mechanic’s toolbox. Parts you may need in addition to wiring (both heavy duty high current type and slim relay control), automotive grade relays, switches, temperature controlled switches or any of the high tech style electronic controllers that are popular today. When wiring an electric fan from scratch, you need to follow the basic rules of electricity, but it is quite simple. Here are some basic tips before you get started – use the correct size wire for your system to pull in power fuses or use circuit breakers to prevent your car (or truck) from catching fire in the event of a short to ground. Getting into moving parts of the fan or motor. Protect wires from fraying and crimping (see above comment about fuses) Make sure all electrical connections are clean, neat and tight. Let’s take a look at some components (besides the fan) before we get to the wiring diagrams! Click this link if you are looking for a quick introduction to Horn Relay Wiring

Radiator Fan Electric Fan Relay Wiring Diagram

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Most Common Automotive Fan Relays Above are some typical relays you may find in automotive applications. An important part to keep in mind is the amperage of your fan system. A single 10 inch fan can draw anywhere from 5 to 20 amps! If you are using 2 fans, considering the size of the fuses, the relay and wiring capacity is even more important. Left end relay – standard automotive Bosch style relay. Pick up a good quality 40 amp version (not the cheap 20 amp versions as shown). This is the most common and easiest installation. Central Relay – This is a high current fan for systems. The relay is rated at 70 amps and has screw terminals that can be a bit more work to fix. However, the small amount of extra work is worth it, as this relay will not have much trouble with most fan systems. I personally like the installation and setup of this relay. I took what I use in my cars – a Tyco 70 Amp relay. They cost a few dollars more, but are a quality piece with plenty of power, which is good for fans because they are rough on relays. Right Most Relay – This is a 70 amp cube style. I’m not a big fan of these because their main power terminals are very different and not that easy to find. They work well and are good for a small area, but not a huge fan (get it). Amazon has them as do many other places, but you have to make sure the 2 terminals are FAT loop style, anything that isn’t is not 70 amp style. Prices are higher than Tyco relays. Attention: Some relays have pre-wired sockets. If the wire gauge is not printed on the wire or you can check the wire gauge if you suspect it is a cheaply made harness. Better to make it yourself if possible, if not get a high quality connector to match your high quality relay. Play it safe and check what you use.

Elec Fan Wiring…is This For Real?

Manual 2 speed fan control well if you see what’s going on you’ll say it’s not really a 2 speed but actually a two stage single fan or two fans at full speed. You’re right, but I’m not sure anyone would buy the “2 level speed control” idea. Either way, it’s a slightly more complicated scheme, well, only slightly. The idea in this case is a toggle switch that can control whether the fan is running, one fan or two fans. This is done with 2 relays of the corresponding amplifier. The little triangle that looks like a switch is a diode. It prevents current from flowing in one direction and allows it to flow in the other direction. The part cost about 25 cents (parts 1N4001 – 1N4007 could be used). With some modifications this circuit can replace the ground side of the circuit instead of the source side of the 12 volt fuses (ask me if you need it, I can compile and post) Steps If you had a SPDT center off switch it has 3 positions , left center and to the right. In the center position there will be no contact with either side and both fans will be off. If you complete the circuit on the LOW side of the relay, only the right fan will turn on. If you connect to the top side of the switch, both relays will activate and both fans will turn on.

Above – some fan fuse solutions. When making fuses or switches, you have several options. the only options

Leftmost – This is the built-in Maxi-Fuse installation. It is recommended! Nice thick wire and waterproof case

Make this a great low-cost built-in holder. Maxi-Fuse can range from 20 to 100 amps, perfect for you

A/c Mkiii Page

Center – typical automotive ATO / ATC style fuse next to Maxi. ATO style can be used (with

Appropriate internal clamp) for the lower amplifier. As you can guess, I prefer the Maxi-Fuse. It is available in various

Right most, this is a reasonable option, an automatic reset circuit breaker. I’m not too excited about the machine

Part but if you have a short then fix the problem you are back on your way without replacing anything. There is a minus

Wiring A Cooling Fan

They are on and off (with a slow delay) until the problem is resolved. It is available in different currents

If the fan is rated at 10 amps, that’s usually the operating current. At boot, fans can get more boosters with a good one

Restriction. Most fans are advised to start with a 20 amp fuse. It will work with fans in the 10-12 amp range

And keeps things safe. Generally a good starting point above this is 50% more amps at the fuse, then round up

Spal Fan Harness

For example, if you are using an 18 amp fan, add 9 amps (that’s 50% more) to get 27 amps. Their number is 27

Amp fuse, so back to 30 amps. If multiple fans are running, it is often better to fuse them separately if one is shorted

At least you have a second to do. When in doubt, the manufacturer’s website will usually tell you

When it comes to fuses, it’s also important to make sure you’re using a thick enough wire for the high power connection.

Wiring Safely: Fan Relay Wiring With C&r Racing

Ventilator. Relays draw very little current, but the fan is a pig. Use a wire size calculator to get an approximate size.

In all cases, I wouldn’t want to use 14 gauge for smaller fans. With wire, bigger is better, thicker is better.

Simple Fan Relay Wiring The picture above shows a very simple and easy fan wiring diagram. It can support one or two fans and uses a simple relay circuit to turn them on. The switch can manually turn the fans on or off. If you use a temperature switch, it can be used to turn them on when the engine reaches a certain temperature. Often, but not always, these temperature switches are single terminal and the body goes to the engine block or radiator, both of which are usually grounded on older cars. Some newer cars may have a 2 terminal temperature switch, in which case one side goes to the relay and the other to ground. The “12 volt fuse” wire goes to the ignition switch which operates it when the key is on. In some cars it is connected to an always-on source (still combined) to keep the car cool even after the key is turned off. Just make sure you know how short to wait for this scenario, and that the battery can drain under strange circumstances. Some machines have a time delay that eliminates the possibility.

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Champion Cooling 180 Degree 40amp Electric Fan Relay Kit For Single Or Dual Fans

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