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Derale Lighted On/Off Switch for Electric Fans

Derale Lighted On/Off Switch for Electric Fans

Item # D16740
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Quickly and easily power your vehicle's electric fan with this lighted toggle switch. 1-800-940-8924 to order Derale accessories and parts part number D16740 or order online at Free expert support on all Derale products. Great prices and Fastest Shipping for Derale Lighted On/Off Switch for Electric Fans. Accessories and Parts reviews from real customers.
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  • Videos (2)
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Derale Accessories and Parts - D16740

  • Radiator Fans
  • Switches
  • Derale

Quickly and easily power your vehicle's electric fan with this lighted toggle switch.


  • Allows quick and easy access to electric fan
  • Lights up for simple identification


  • 3-Pole
  • 12 Volt
  • 1-Year warranty

16740 Derale Lighted Toggle Switch

Video of Derale Lighted On/Off Switch for Electric Fans

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Derale Lighted On/Off Fan Switch Installation

Today, on our old trailer, we'll be installing the Derale on/off switch, part number D16740. We'll begin here by removing the old, broken switch. To do this, we'll need to remove the two screws that hold the plate. Then, we'll remove the two wires from the back side. With the wires removed from the back side of the switch, we'll go ahead and squeeze the tabs on the top and bottom. This will allow the switch to come out of the plate.

You'll notice that the old switch only has two prongs on the back, and the new one has three. Now, on the new one, we will not be using the gold prong, we will be using the two silver, or chrome colored, prongs. Because, we'll only be using two of the three prongs, the light up feature will not work, but the switch will still turn the interior lights on and off in this trailer. Now, to install our new plug, we'll go ahead and take the plate and the plug, sliding the plug from the front side and pushing it into position, making sure that the locking tabs snap in. All that's left then, is to reconnect the two wires on the back side. It doesn't matter which wire goes on either of these two chrome prongs here. The switch will work either way.

We'll slide each of our wires over the prongs. It's a good idea to test the switch, before we mount it back to the wall. That is the on position. That is the off position. Now that we've tested our switch, all that's left to do is to put the two screws back in that hold it to the wall. That's all there is to it, to installing the Derale lighted on/off switch, part number D16740.


Customer Satisfaction Score:

Customer Reviews

Derale Lighted On/Off Switch for Electric Fans - D16740

Average Customer Rating:  5.0 out of 5 stars   (3 Customer Reviews)

Quickly and easily power your vehicle's electric fan with this lighted toggle switch.


Still toggles, the light is a bit brighter than what I anticipated which is rough at night. Installed on dash of truck to engage turbo brake, when I get around to it I will be changing it out for something less bright. The switch works perfect.


I needed a low pair of lites for my lawnmower. These worked perfectly for my needs. Delivery was very quick. I have bought from Etrailer in the past with same results on trailer hitch accessories. Customer Service is great.



See what our Experts say about this Derale Accessories and Parts

  • Kill Switch Idea for Powered Landing Gear Jack to Help Deter Theft
    You could make a kill switch with something like the Derale switch # D16740 so that when you have this switch off the jacks won't operate. The key will be to hide this switch so that only you'd know where it is. You'd want to install this on the power wire for your current switch's circuit and you'd be set.
    view full answer...
  • Could Magnetic Switch of RV Steps be Replaced by Standard Switch
    Yes, you could use a physical switch instead of the magnetic switch on your RV steps. Basically the magnetic switches operate in the same way as a standard switch so you'd just need to cut the magnets off of the circuits and then run them to a switch like the # D16740 which will perform the same function.
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  • Replacement Switch for Dome Light in Camper
    I do have a solution for you, however based on my research, it appears that the exact switch part number 212481 referenced in your question is no longer available from the manufacturer. We do have some replacement switches available that should work with the existing dome light in your camper. I recommend looking at the Derale Lighted On/Off Switch # D16740, which looks very similar to the switch you are needing to replace. This is a 3-Pole, 12 Volt switch that can be used to power your...
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  • Can Switch Be Used to Easily Reset Stereo in RV
    A simple switch like the Derale part # D16740 would work great for what you are wanting to do by giving you a simple way to reset the stereo so that Bluetooth works again.
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  • How to Determine if Derale 32" High-Output, Electric Radiator Fan-and-Shroud Assembly Will Work
    Even though the engine components we carry are meant to be a supplement to the OEM components we have heard of people using them as replacements for OEM products. If you want to try using the Derale 32" High-Output, Electric Radiator Fan-and-Shroud Assembly # D16934 as a replacement then you need to make sure the 4,000 CFM (cubic feet per minute) is a high enough rating and that the overall dimensions of this product will fit your aplpication. I have attached a diagram showing the dimensions...
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  • How to Wire the Derale 26 Dual Electric Radiator Fan Part # D16927 to a Manual Switch
    In order to wire the Derale 26" Dual High-Output, Electric Radiator Fan-and-Shroud Assembly part # D16927 to a manual switch you will need two of the Derale Lighted On/Off Switch for Electric Fans part # D16740. There are three terminals on the switch which are for accessory, power, and ground. The accessory terminal will need to be attached to the yellow wire on the included relay harness. The power terminal will need to be attached directly to the positive battery post and the ground...
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  • Recommended Radiator Fan For 2012 Chevrolet Express Van
    One thing to consider when installing a radiator fan is the amount of room you have for installation. I recommend installing a fan in front of the radiator. You will want a fan that has a high CFM(cubic feet per minute). If you have the room I recommend a fan like the Derale, part # D18217. This fan has a high output of 2,400 CFM on high speed and 1,800 on low. The fan overall dimensions are 16-7/8 inches wide x 16-7/8 inches tall x 2-5/8 inches deep. If you find the fan will not fit...
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  • Can Derale D16928 be Used as Pusher Fan
    The Derale fan you asked about is only able to be used as a puller, so it wouldn't work as a pusher application. And these electric fans should be mounted inside the engine compartment as opposed to outside (you wouldn't want it exposed to the elements). The best option we can offer if you have limited clearance is a pusher fan with as little depth as possible: - Derale 17" High-Output, Electric, Single Radiator Fan - 2,400 CFM # D18217 This is a single fan which is 16-7/8" wide x 16-7/8"...
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  • Switch to Use for Trailer Lights Powered by Trailer's Battery
    You have it figured out I'd say. It really is just a matter of running the lights to the battery you install in your trailer like you mentioned. We use switch part # D16740 a lot for this type of install. Check out the install video link I attached to see the install process using this switch to power lights. No fuses or resistors would be needed either. 14 gauge wire would be adequate as well.
    view full answer...
  • Could LED Flood Light # 3371492139 be Wired to Switch
    You would just need to wire the LED Flood Light # 3371492139 to your truck battery through a switch so that you could turn it off and on as needed. For a switch we then have the # D16740 which you could mount on your dash.
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  • Does the Buyers Products LED Lighting Kit Include a Switch
    The Buyers Products LED Light Strip # 3375623755 that you referenced is designed to be tapped into a circuit so that it gets activated when the running lights or head lights get turned on. If you wanted to install a switch you could. For a switch you could use the # D16740. The optional switch that used to be offered as a separate item for the CIP EVO lights has been discontinued.
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  • Replacing Clutch Radiator Fan with an Electric Fan on a 1999 GMC Yukon
    Pushers are more efficient and more common. A puller is typically only installed when you don't have enough room between your engine and your radiator. It looks like your 1999 GMC Yukon has a 5.7 L V8 engine which means you would want to shoot for a CFM (Cubic Feet per Minute) range of 2,200 - 3,000. The most popular fan that we have in this range is the Derale 17" Radiator Fan # D18217 which has an output of 2,400 CFM. When it comes to fitting your vehicle it really just depends on what...
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  • How to Activate Derale 14 Inch High-Output, Electric, Single Radiator Fan
    Good question; to activate the Derale 14" High-Output, Electric, Single Radiator Fan - 2,100 CFM # D18214 you can use either a manual switch or a thermostatic fan control, both of which we do have. The switch will allow you to simply turn the fan on or off when you deem appropriate, while the thermostatic control engages at its determined temperature, which in the case of this fan and control is 180 degrees. - Switch: Derale Lighted On/Off Switch for Electric Fans # D16740 - Thermostat...
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  • Switch Options for the Derale Hyper-Cool Remote Cooler Assembly w/ Fan
    A relay would not be required for the installation of the # D15860. All that is needed is power and ground and it will work just fine. You could activate it with a switch like part # D16740 or with a thermostat switch like part # D15721.
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  • What Temperature Does the Fan Activate on the Derale Remote Transmission Cooler # D15830
    On the Derale Transmission Cooler, part # D15830, the operation of the fan will depend on which way it is connected to your vehicle. You can wire the fan to be turned on manually by using a switch like the Derale Lighted On/Off Switch, # D16740. This way you can turn the fan on and off as needed. The other way is to use the Derale Remote Mounting Kit, part # D13023. This kit will use an in-line thermostat that will turn on the fan at 180 degrees and automatically turn off the fan at 165...
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  • Recommended Transmission Cooler for 2005 Jeep Liberty
    The Derale Transmission Cooler you referenced, # D13503 would be an excellent choice to protect the transmission of your 2005 Liberty. An aftermarket cooler will keep your transmission fluid in the optimal temperature range, below 200 degrees. The optimal installation position would be directly behind the grille, in front of the radiator and A/C condenser. Because of the plate-fin design of the transmission cooler, plenty of air will be able to pass through it and reach the A/C condenser...
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  • Is Derale Dual Electric Radiator Fan A Variable Speed
    The Derale Dual High-Output, Electric Radiator Fan, part # D16825, is a single speed system and both fans operate at the same time. There are options available for control of the fans you may be interested in. The first is to use a switch like the Derale Lighted On/Off Switch, part # D16740. This switch is a simple toggle switch that allows you to easily turn your fans on or off. If you wish to install an automatic system, I recommend part # D16789. This will turn the fan on or off...
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  • Depth Dimension Of Derale 32 Inch Dual Tornado Electric Fan
    The attached drawing of the Derale 32 inch Dual Tornado Electric Fan Assembly, part # D16834 has the mounting brackets attached. With the brackets attached, the overall depth is 1-3/4 inches. This is intended for tight areas as you said you have. The hardware is not included that you would need to mount the fan to the vehicle. I also recommend the Derale 40/60-Amp Dual Relay Wiring Harness for Dual Fan Assembly, part # D16765, since the fan does draw more than 10 amps. This will help...
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  • Will the High-Output, Dual Electric Radiator Fan Assembly 4,000 CFM # D16934 Fit on a 1985 Ford
    The Derale 32 inch High-Output, Electric Radiator Fan-and-Shroud Assembly - 4,000 CFM, item # D16934, is designed as a universal application and will mount behind the radiator on your 1985 Ford with 6.9 Liter diesel engine. You will need to measure to be sure there is room to mount the assembly behind the radiator. I have listed the dimensions below. Width - 31-3/8 inches Height - 15-3/4 inches Overall Depth - 3-1/4 inches Mounting Holes - 12-7/8 inches Top to Bottom Mounting holes -...
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  • Cooling Options For Chevy Express 3500 When Towing a 30 Foot Travel Trailer
    Since you have already added an aftermarket transmission cooler to your Chevy Express 3500, you can make sure you have it mounted in the most efficient location for cooling. The ideal place to mount an aftermarket transmission cooler is behind the front grille but in front of the radiator of your vehicle. Adding an electric fan like the item you selected, Derale Radiator Fans, part # D16834, will help reduce engine temperatures and would be a good option. You will need to measure to make...
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  • Will Electric Fans be Effective for 2002 Dodge Ram
    An electric fan will absolutely be able to keep up and is going to be a really good benefit for when you are towing with your 2002 Dodge Ram 2500. You will want to get one that has a solid cubic feet per minute (CFM), and I recommend the Derale 16" Dyno-Cool Curved-Blade Electric Fan - 1,980 CFM # D18916. This is the best option because it is a great value, providing you with plenty of cooling power for the price. It can be used as a pusher or puller and you just need to make sure you...
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  • How to Disable Electric Stabilizer Motor Switch to Prevent Kids From Tampering
    You could add a killswitch to the power wire of the electric stabilizer switch that's out of plain sight so that kids who were tempted to press the button wouldn't affect anything. For that you could use the part # D16740 hidden in an area that would be harder to find. It would be a matter of just adding this inline with the switch's wiring so that when it's off the main switch does nothing.
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  • Does Optronics Unitek LED Directional Lights # 826LED Have Switch
    The Optronics Unitek LED Directional Lights # 826LED that you referenced does not have switches. You'd wire them to a switch to activate them as needed. For a switch you could use the part # D16740.
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  • Does Installing Three ThermaHeat RV Holding Tank Pad Heaters Require Three Switches
    If you wanted individual control of each of the tank heaters like part # 277-000163 you'd be best served with a 3 gang system switch kit (we do not carry any) which would give you a panel to control all three heaters. Of if you wanted to use a single switch for all of them you could use the Derale # D16740 and you'd be set. Each of these heaters draws 4.8 amps so you'd need to run them all to a circuit that is capable of handling at least 15 amps and you'd be set. There'd be no need to...
    view full answer...

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Info for this part was:

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