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Derale Lighted On/Off Switch for Electric Fans

Derale Lighted On/Off Switch for Electric Fans

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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. Guaranteed Lowest Price and Fastest Shipping for Derale Lighted On/Off Switch for Electric Fans. Accessories and Parts reviews from real customers.
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  • Reviews (2)
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  • Videos (2)
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Derale Accessories and Parts

  • 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

Item # D16740

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 Reviews

Derale Lighted On/Off Switch for Electric Fans - D16740

Average Customer Rating:  5.0 out of 5 stars   (2 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.


Ask the Experts 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...
  • 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...
    view full answer...
  • 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...
    view full answer...
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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...
    view full answer...
  • 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...
    view full answer...
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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.
    view full answer...
  • 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 -...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • 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.
    view full answer...
  • 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...
    view full answer...
  • 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"...
    view full answer...
  • Wiring for the Third Brake Light and Dome Light for an ARE Camper Shell on a 2012 Nissan Frontier
    When installing a camper shell on a truck, typically, there is not a specific wiring harness for the third brake light and dome light. I am not aware of a wiring harness for a Nissan Frontier that will provide those functions for a camper shell. The installation of a camper shell usually consists of using the appropriate lengths of wire for the third brake light and dome light and splicing them into a corresponding circuit on the truck. It would be best to choose the same size wire, so...
    view full answer...
  • How to Wire a Bully Bumper Mount Back-Up Light on a 2007 Kawasaki Mule
    Since most likely there isnt a reverse activated circuit on your 2007 Kawasaki Mule I think your best option would be to install the Bully Bumper Backup Light # PL-807 and use a switch to turn the light off and on. Basically both the wires from the light would get run to the battery with a switch wired in on either of the wires. For a switch you could use a Derale Lighted On/Off Switch # D16740 and mount it somewhere within easy access on your Mule.
    view full answer...
  • Could the Vision X Duralux Light be Powered by a Running Light Circuit
    The # DURA-410 only draws 1.6 amps when on so it could be pretty easily powered by your running lights, but this light is pretty bright so I would doubt you would want it to be running at all times when your headlights or running lights are running. It would be best to power it with a switch like the part # D16740 from the battery.
    view full answer...
  • Can the Hopkins Smart Hitch Backup Camera Be Activated with Just a Switch
    You can use the Hopkins Smart Hitch Backup Camera and Hitch Aligner System # HM50002 with a switch if desired so that you can turn it on whenever needed, but since it only has one way to turn it on you would not be able to also have it come on automatically when the vehicle is in reverse. You would have to pick between it coming on automatically while in reverse of having it switched so that you can turn it on whenever needed. Basically you would just clip the wires that run to the 7-way...
    view full answer...
  • How to Wire a Camper Shell Third Brake Light and Interior Lights on a 2011 Chevy Silverado
    You are going to want to find the Center High Mount Stop Light wire for the brake light on the truck cap on your 2011 Chevy Silverado. This wire is bundled with the brake controller wiring located under the dash, and held together with tape and a tag that lists the wiring functions. The wire you are looking for is orange and will have a tag on it labeled CHMSL. For the interior lights, if they are on a switch, you can run a wire from 12 volt hot lead behind the factory 7-Way to the switch...
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  • Can the Hopkins Smart Hitch Backup Camera # HM50002 Be Activated While Driving
    You can hardwire the Hopkins Smart Hitch Backup Camera # HM50002 to your vehicle battery through a switch to let you turn it on whenever you wanted. The red wire of the harness would need to get run to the positive side of your battery while the black wire would get run to the negative side of the battery. On either of these circuit you would need to wire a switch in. For a switch you could use the Derale Switch part # D16740.
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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.
    view full answer...
  • Could Switch be Used to Power Two of the 18-1/4" x 12" Holding Tank Heater Pad 277-000164
    As long as the switch can handle the amperage load of two of the heating pads part # 277-000164 yes it would be fine. This heating pad draws 4.8 amps. So the switch would need to be able to accommodate 9.6 amps. The part # D16740 would easily handle the amperage.
    view full answer...
  • Switch for Heating Pad 277-000163
    As long as the switch can handle the amperage load of two of the heating pads part # 277-000163 yes it would be fine. This heating pad draws 5.8 amps. So the switch would need to be able to accommodate 9.6 amps. The part # D16740 would easily handle the amperage.
    view full answer...
  • How Would the Custer Single Function LED Strobe Driver # STR-QRLY Wire to a Switch
    You would need a Custer Single Function LED Strobe Driver # STR-QRLY for each light circuit that you want to strobe. On the in side of the unit you would want to run your switch like part # D16740 on either the power or ground side. Then on the output side you would just run that to the lights you want to strobe. You should note that this strobe unit is not designed for use as a blinker system.
    view full answer...
  • Easy Way to Deactivate LED Monitor Light of SMI DUO When Driving Vehicle
    So do you want the LED to be totally non-functional or are you looking for a way to have it activate in a different way?
    view full answer...

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Info for this part was:

Employee DeAnne T
Updated by:
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Updated by:
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Employee Daron K
Updated by:
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Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Video Edited:
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Employee Chris R
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