How To Wire Electric Fans To A Switch – Electric vehicle fans and wiring On the other side we worked a little with relays and one with the horn, now here comes an introduction to electric cooling fans and how to connect them safely. It is mainly intended for vehicles that do not yet have wiring, retrofits, racing cars, etc. If your car already has an electric fan, most of the hard work is done. The view above is an example of several electric fans of various styles (some not to scale). Fan wiring diagrams start from the simplest to the most complex, so you can easily work with them. Electric Fan Wiring This is really the main focus of the page here. Installation is left as an exercise for the reader (remember school!). You don’t need a lot of tools, but you do need a good bobbin and the usual tools in your mechanic’s toolbox. Parts you may need in addition to cables (either high current type or fine relay control), automotive relay(s), circuit breakers, temperature control switches, or one of the high tech electronic controls now available. To connect electric fans from scratch, you need to follow some basic rules of electricity, but it is very simple. Here are some important points before you begin – Use the correct wire size for your system’s current flow Fuses or circuit breakers should be used to prevent your car (or truck) from burning to the ground in the event of a short circuit. Getting into the moving parts of the fan or motor Avoid fraying and shorting wires (see comment above about fuses) Make sure all electrical connections are clean, tight and tight Let’s look at some wiring diagrams before we get to them. Let’s pay for the components (well, except for the fan)! If you are looking for a quick introduction to relay horn wiring, click this link
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How To Wire Electric Fans To A Switch
Common Automotive Fan Relays Above are some of the most common relays you may encounter in an automotive application. An important part to consider is how much power your fan system will draw. A 10-inch fan can draw 5 to 20 amps! If using 2 fans, note that fuse size, relay capacity and wiring are more important. Left relay – Bosch standard type automatic relay. Look for the good quality 40 amp version (not the cheap 20 amp version pictured). These are the most common and easy to install. Central Relay – This is for high current fan systems. The relay is rated at 70 amps and has screw terminals that can be operated slightly. The little extra work is well worth it though, as this relay doesn’t have many problems with most fan systems. I personally like the configuration of this relay. I chose the one I use in my cars – a 70 amp Tyco relay. They cost a few dollars more, but they are quality pieces with a huge capacity, which is good for fans because they are tough on relays. Rightmost Relay – This is a 70 amp style cube. I’m not a huge fan of them as the main power terminals are very different and hard to get hold of. They work well and fit in a small area, but they are not big fans (understood). Amazon has them, as do many other places, but you need to make sure the two terminals are FAT lug type, anything that isn’t is not 70 amp style. Prices are higher than Tyco relays. Caution: Some relays have wired terminals. If the wire gauge isn’t stamped on the wire or you can check the wire gauge, suspect it’s a cheap wire harness connector. Best to do it yourself if you can, otherwise get a high quality connector to match the high quality relay. Play safe and check what you use.
Gmpp Harness With Vintage Air And Dual Electric Fans??
Manual control with 2 fan speeds Well, if you see what’s happening, it’s not really two speeds, it’s two levels, one or two fans at full speed. You’re right, but I’m not sure if anyone understood the idea of ”2 level speed control”. Anyway, this circuit is a bit more complicated, well just a bit. The idea in this case is a selector that can control whether it works without a fan, one fan or two fans. This is done with 2 relays of suitable amperage. The small triangle on the switch is a DIODE. This prevents flow in one direction and allows it to flow in the other. The price of this part is about 25 cents (parts 1N4001 – 1N4007 can be used). With a few modifications this circuit can switch the ground side of the circuit instead of the 12v fuse source side (ask if you need it and I can do and post it) Operation If you had a SPDT centralized switch, these 3 positions do it. Left, center and right. In the middle position, no contact is made with either side and both fans are switched off. If you complete the circuit to the LOW relay, only the right side fan will turn on. Connecting to the HIGH side of the switch will activate both relays and turn on both fans.
Above – some fusible fan solutions. You have a few options when making a fuse or circuit breaker. the only options
Far Left – This is a Maxi-Inline Fuse Harness. These are recommended! Stylish thick thread and waterproof case
Turn them into a cheap indoor fuse holder. Maxi fuses can be rated from 20 to 100 amps to suit you
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Center – normal car ATO/ATC fuse next to the Maxi fuse. The ATO style can be used (with
Suitable line support) for low amperage fuses. As you can imagine, I prefer the Maxi-Fuse. Available in different types
Far right – This is a reasonable alternative, automatic reset switch. I’m not particularly interested in automatics
Section, but if you have a short, fix it, without replacing anything, you’re back on your way. The downside is this
Electrical Wiring, House Wiring Or Home Wiring Complete Guide
They turn on and off (slow delay) until the problem is solved. These are available in many different streams.
If the fan is rated for 10 amps, that current will operate normally. At startup, fans can consume more amps per item
Limit. For most fans you want to start with a 20 amp fuse. Works with fans in the 10 to 12 amp range.
And it keeps things safe. Typically a good starting point beyond that is 50% more amps on the fuse and then up
Automotive Electric Fans
For example, if you are using an 18 amp fan, add 9 amps (that’s 50% more), which is 27 amps. Their number is 27
Fuse ampere and round up to 30 ampere. If multiple fans are running, it is usually best to fuse them individually if one is shorted
You are still working for at least one second. When in doubt, look at the manufacturer’s website, they usually provide some
When talking about fuses, it is also important to make sure to use wire that is thick enough for the high current connection.
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The relays draw very little current to the fan, but the fan is a pig. Use the wire size calculator to get an approximate size.
In any case, I wouldn’t use gauge less than 14 for the smaller fans. Wired, bigger, thicker is better.
Simple Fan Relay Wiring The image above is a very simple and basic fan wiring diagram. It can support one or two fans and uses a simple relay circuit to turn them on. The power 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 motor reaches a set 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. On some newer cars you may have 2 terminal temperature switches; in this case one side goes to the relay and the other side goes to ground. The wire from the “12 volt fused source” goes to something like the ignition switch that powers it when the key is on. In some cars it connects to an always-on source (still melted) to keep the car cool even after the key is turned off. Just make sure you’re aware of the short-term future of this scenario, and in the odd situation you could end up with a dead battery. Some cars have a time delay that eliminates this possibility.
Automatic 2
