1. Wiring
  2. Curt
  3. Wiring Adapters
  4. Multi-Function Adapter
  5. 7 Blade
  6. 4 Flat
Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps

Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps

Item # C57674
lowest price pledge
Retail:$54.71
Our Price: $31.47
You Save: 42%
Wiring
Orders above $99 qualify for Free Shipping
Shipping Weight: 1.3 lbs
Quantity: 
In Stock
Curt Wiring - C57674
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet. Lowest Prices for the best wiring from Curt. Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps part number C57674 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (243)
  • Q & A (152)
  • Videos (9)
  • Photos
  • Why etrailer?

Curt Wiring - C57674

  • Wiring Adapters
  • Multi-Function Adapter
  • 7 Blade
  • 4 Flat
  • Plug and Lead
  • Curt
  • 4 Flat

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.


Features:

  • Adapts 4-way flat to both 7-way round and 4-way flat
  • Includes integrated test lamps which display proper connections
    • Shows if the wiring on your trailer isn't working properly - burned out bulbs, poor connection, etc.
  • Includes mounting bracket and hardware
    • Distance between vehicle mounting holes center to center: 2-1/4"


57674 Curt Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps

Installation Details C57674 Installation instructions


California residents: click here


Video of Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps

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




Video Transcript for Curt 4 Pole to 7 Pole and 4 Pole Adapter Review

Hi there, towing enthusiasts. Today, we're going to be taking a look at Curt's 4-way Adapter to 7-Way and 4-Way with Test Light. As you can see here, our trailer has a 7-way connector but our vehicle used to only have a 4-way connector. With this adapter, we are able to break it out and have a 4-way and a 7-way so we can fit our plug in, because without it it's like trying to fit a round peg in a square hole.When comparing this to other similar adapters, the things that I like about this one over those is that it has both the 7-way and the 4-way. Some are just an adapter at the back that will allow you to plug your 4-way into it, giving you a 7-way, but then you lose the functionality of your 4-way unless you we're to unplug it from your 7-way each time. I love having this breakout for your various accessories that you may use.Another feature that really stands out is the tester that's included in it.

This is a great thing to have on hand, because often whenever you have an issue with your trailer, it always seems to be like when you're out on vacation, and why spend time having to go to a shop to get it fixed when you can have a tester right here and you can immediately tell if the fault is with your vehicle side or your trailer side for a quick easy diagnosis so you can get that problem fixed and get back on the road.If you have an existing 4-way connector on your vehicle, this adapter will attach and it'll plug right into your 4-way connection. It'll break that out into a 4-way that you can still access, so if you have accessories that use a 4-way, you're not losing your 4-way, but you are gaining a 7-way. By plugging your 4-way into the connection at the back of this connector, it'll take all those 4-way connections and put it out here in your 7-way giving, you all your necessary lighting, which includes your left turn signal, right turn signal, tail lamps, and brake lamps.We've now plugged in our trailer's 7-way connector into the connection in the back of our vehicle and here you can see our lights are operating on our trailer through that 7-pole connection. This'll keep us safe and legal when using our trailer is and it allows everybody behind us to know our intentions when driving down the road because they can see all of our lighting signals.Now if you we're intending on using a larger trailer that may have had breaks on it or additional accessories such as a power jack, you may need some additional connections here at your 7-way. There are breakout wires for those remaining connections and you can wire those up as well.Of the three remaining connections, one of them will be for your brake signal, which is the output for a brake controller, so you can then add a brake controller.

Next, it also has a charge line cable, which is your 12-volt, so you can charge a battery on your trailer or operate a tongue jack. Lastly is your reverse light circuit, which you can tap into the vehicle, so whenever you backed up on your vehicle, those reverse lights will also illuminate on your trailer.When not in use, our 7-way campus spring loaded, which will help it shut and there is a rubber gasket on the inside which will keep out any moisture, ensuring a long lasting connection. There's also a dust for our 4-way. This one is manual, it's not spring loaded, but it does function similarly, keeping out moisture to ensure long life on that connector as well.Now that we've gone over some of the features of our connector here, let's go over how you would install it on a vehicle that has an existing 4-way and give you some tips and pointers on how to get it completely set up for a full 7-way connection.A mounting bracket does come included with your 7-way adapter. Hardware also comes included to get it mounted up.

You can attach this to the bottom of your hitch, to the bottom of your bumper, wherever you'd like. We're using a no-drill bracket, and this will allow us to secure our bracket to our hitch without having to drill into it, which is nice because you won't chip the paint or anything and you don't have to worry about corrosion occurring at those drilling points. From there, our bracket that came with our adapter bolts directly to this no-drill bracket. If you need a no-drill bracket and you don't want to drill to get the bracket that comes included with it installed, you can pick up these no-drill brackets here at etrailer.com.You're going to be using this just to take your lighting from the your existing 4-pole connector so you can use it with the 7-pole. All you have to simply do is plug it into the harness that's coming out of the back.

We plugged our factory 4-pole into the 4-pole off of our new harness and then take the white wire coming out of our harness and use the included self-tapping screw to connect it to your frame or anywhere that's metal and grounded. If you're just using it for your lights, you're all done. These three wires don't need to be connected and we'll have all of our lighting signals at our 7-way, as well as the 4-way, located easily and conveniently at the back of the vehicle.The backup white wire, you can simply tap into the backup lights on your vehicle and then it'll send those signals out to your 7-way. For getting a brake controller set up with your charge line, I would recommend the universal wiring kit for brake controllers. You can pick it up here etrailer.com by using part number 5506. This will come with all the wiring, circuit breakers, butt connectors, and ring terminals you'll need to hook up a brake controller and the remaining wires from our 7-way connector here to the rest of the vehicle.Once you've got it all hooked up, we can test it out to make sure that everything's working using the included tester on the side of our 7-pole connector here. You want to make sure you have your left turn signal, right turn signal, tail lamps, and brake lamps.That completes our look at Curt's 4-Way Adapter to a 7-Way and 4-Way with Test Light.


Customer Reviews

Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps - C57674

Average Customer Rating:  4.7 out of 5 stars   (243 Customer Reviews)

This multi-function, vehicle-end connector converts any 4-way flat, vehicle-end plug to a combination 7-way outlet and 4-pole flat outlet.

- C57674
by:

Worked great! Would buy again. 599093



- C57674
by:

Working perfectly after one year. Easy to install. Thanks for such a great product! 570896



- C57674
by:

Best thing I did for my Pop Up camper. It allowed us to use the electric brakes. We do not even notice the trailer back there any more. Only thing is the little red light stays on all the time (like it is supposed to) so people are always letting us know we have a light on. 724919



- C57674
by:

This is the second vehicle I have installed this adapter on. We tow a Coleman popup and another smaller trailer so we need both the 4-pin and 7-pin adapters. The test lamps are great to confirm that you have installed the wiring correctly. 401368



- C57674
by:

I use both 4 pole flat and 7 pole connections on our trailers so this fit the bill. Here, I welded a bracket to use it on our Dodge Journey. 563114



- C57674
by:

Great product I used this to convert my 4-way harness to a 7-way + 4-way harness on my 2011 Toyota Sienna. Everything went really well. The only very small complaint I had about this product is the length of the white ground wire. It was too short to reach a good grounding point on the frame so I had to go buy some extra wire and connectors to extend it. Make that cable about 3 ft longer, and just provide the ring terminal and this would be a perfect product. Installing it makes me want to splurge on a tow controller and charge line... 135750


Comments
HiI have a toyota sienna 2011 and i want to tow a pop-up camper. Mine has a towing package. The camper is around 2400 lb. in your case do you think a brake controller is necesary?can you tell me What kind of cable do u buy to extend the white ground cable?Di d u buy the no drill tie bracket?
-- comment by: Aldo - 06/27/2014

5189
Comments
Aldo. We towed a popup trailer that was little less than that loaded weight without any issue. This was a one time rental for us. We towed up over Vail Pass in Colorado without any issue at all. The engine and transmission on the Sienna could tow a lot more weight, it is limited due to the suspensiontire rating.The only problem we faced is that when hitched we couldnt open the rear door of the sienna due to the trailer jack on the tongue of the trailer.If I was to tow regularly I would invest in a break controller, charge line, and a Weight Distributing Hitch. The main limitation in towing with a sienna is the hitch weight.No I didnt buy the tie bracket. The hitch I purchased 75696 had a built in bracket that this fit on perfectly just had to get a few screws/nuts for it.I just bought some 12 guauge auto wire at autozone.
-- comment by: Daniel S - 06/30/2014

5220

- C57674
by:

I installed this 4 to 7pin adapter with the T-one harness 118449 and the Drawtite hitch on my 2016 Toyota Highlander. I think the install was 1st rate. This adapter allows me to connect either a 4 pin or 7 pin plug. Nice. Very simple to check out the installation with the test lights. Adapter looks rugged and well made. The 4 pin receptacle that slides into the bracket should have better retention though. Also I provided a picture of the 4 wire cable from the car harness to the adapter as it exits the storage compartment. I removed the grommet/seal. Made an X cut in the center. Forced the cable through it. Made a waterproof seal with RTV. 322171



- C57674
by:

I really liked the idea of having the LEDs to let me know if I was having any problems with the wiring harness, but I did find a problem with it. I installed the wiring harness myself, using the instructions on the website, but after connecting everything I realized that the LED for 12v power is always on. It is not switched by the key, so although an LED should have low draw, this might not be a good idea on a work truck that stays parked for long stretches. 80885


Comments
I am still very happy with this adaptor, but I did put back in the plug on my brake controller so I could unplug it when the trailer was not connected, the brake light was on, and I disconnected the continuous 12v. Also, make sure your 4 wire connector is clean or you might have dim lights. Although the LEDs are useful, I found a plug in tester to be more accurate because of the false brake signal I was getting.
Chris H - 05/19/2014

4322

- C57674
by:

Great product! Sturdy and weather-proof connections and wires! Easily installed. Thanks Curt and etrailer.com for an awesome item! 68991



- C57674
by:

Product was just what I wanted and arrived in only two days even though I only asked for snail delivery. 877933



- C57674
by: 08/16/2020

good product but if you connect it direct on the battery there will be one red led that remains on always 863403



- C57674
by:

I called to ask technical questions to be sure this was the correct product for our suv. Customer support is superior with excellent support and advice. So helpful. 862843



- C57674
by:

Does the job it was made for. 857700



- C57674
by:

Took me A minute to figure out how to loosen the band. Once that was accomplished, the rest was easy. Quick delivery too! 853362



- C57674
by:

Easy to install and looks great. 817391



- C57674
by:

It Works Really Well, No Problems With It At All Holding Up In All The Different Weather I’ve Experience, Good Investment , Very Happy With It 817187



- C57674
by:

I terminated my Tenkosha wiring harness into this Curt plug/adapter and it was perfect. I got it all done by the weekend we were going to need it but ended up not using the trailer. That was the only downside. It's all been working great since. 816588



- C57674
by:

I purchased this for our 2017 Journey originally in the fall of 2017. Last year we were in an accident (not our fault). We bought another identical 2017 Journey and ordered an identical setup for it. I was happy the first time with the parts and I simply duplicated it on the replacement Journey. 804482



- C57674
by:

Easy installation. With the proper tools can be installed in 30 minutes 796606



- C57674
by:

Excellent product, worked exactly as advertised, super easy to install. Video is A+++ 793952



- C57674
by:

great product works great. 784710



- C57674
by:

Works as advertised. 783901



- C57674
by:

I used this harness as a temporary hook up on our Ford van. I was setting our our Chevy Equinox as a tow car and wanted to test pull it with the van without having to get our motor home out for that task. The harness worked great. 774765



- C57674
by:

No problems. all the trailer light work as required. 773162



- C57674
by:

Universal adapter. Not the best instru ctions 766192


29
254
Show More Reviews

Ask the Experts about this Curt Wiring

  • Should the 12 Volt Circuit On the Adapter 4 Pole to 7 Pole with Test Lamps Stay On All the Time
    In regards to the Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps part # C57674, the 12 volt power circuit (black wire) will remain active at all times if connected directly to the battery. That said, the LED on the trailer connector doesn't draw enough power to drain the battery if that is what you are worried about. If you only want the circuit active while the vehicle is running then you will need to install the Tow Ready Battery Isolation Solenoid part # TR118665 which works as an...
    view full answer...
  • Installation of 7-Way and Brake Controller on 2016 Ford Expedition with Factory 4-way
    For your 2016 Ford Expedition, I recommend the Prodigy P3 # 90195 for a brake controller due to the ease of use and reliability. It is a customer favorite because of the LCD screen and diagnostics as well as preset boost options. You will then use custom wiring adapter # 22292 which connects to a factory harness behind your dash. I've attached installation instructions to assist. As you stated, there is a blue brake wire and there is also a hot lead wire that is orange or red. This...
    view full answer...
  • Parts Needed to Install Curt Echo Brake Controller on 2016 Toyota RAV4 with 4-Way Connector
    We do recommend using the Upgrade Kit # ETBC7L to make your tow vehicle (2016 Toyota RAV4) 4-Way compatible with the Curt Echo # C51180. With that being said, the Curt Adapter # C57674 you picked up will actually work out great! You just need a few more pieces to finish up the ETBC7L kit: 20' of 12 Gauge Wire - # 12-1-1 30 Amp Circuit Breaker - # PK54530 3/8" Ring Terminal - # DW05705-1 2 Count of the 3/16" Ring Terminal - # 44-5310A 3 Count of Self-Tapping Screw - # FA1131822 Zip...
    view full answer...
  • Installing Curt 7-way Trailer Connector Without Connecting Additional Wires
    If you just need a 7-way trailer connector for the sake of connecting to a trailer with a 7-way and not for the additional functions then you can install the Curt # C57674 and either cut off or cap off the extra wires.
    view full answer...
  • Does the 12 Volt Power Wire Need to Be Ran on a 7-Way Trailer Connector
    The 12 volt wire on a 7-way trailer connector like the Adapter 4 Pole to 7 Pole and 4 Pole part # C57674 is more often than not used to charge a battery on the trailer such as the ones used in a breakaway system. If there are no 12 volt accessories on the trailer then there is no need to run the additional wire. It really doesn't have anything to do with the tow vehicle. If your trailer has brakes then instead of the above adapter I recommend using the Universal Installation Kit part...
    view full answer...
  • Should the BK Indicator Light on the Curt Adapter be Lit up While Vehicle is Off and No Trailer
    The BK light indicator on the Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps # C57674 that you referenced means that your brake controller is sending power to the pin in the 5 o'clock position. This should only be lit up when you are either coming to a stop with a trailer hooked up or using the manual override lever on your brake controller to send max power to the 7-Way. The only indicator light that should constantly be lit up is the 12V indicator light which is connected to the...
    view full answer...
  • Can Second Trailer Have Trailer Brakes Activated as Well
    Sounds like you are towing two trailers that both have trailer brakes. As long as the brake output circuit is completed from one trailer to the next the part # C57674 would work to send the amperage to each trailer. You will want to be sure that each trailer has 10 gauge wire for the brake output circuit like part # 10-1-1 (sold by the foot). The blue wire of this adapter would need to get run to the output of a brake controller that is designed to handle the amount of brake assemblies...
    view full answer...
  • Adding a 7-Way Trailer Connector to a 2007 Toyota Tacoma
    In order to install a 7-Way trailer connector on your 2007 Toyota Tacoma you would first need to install a 4-Way and then hardwire in a 7-Way using # ETBC7. There isn't a plug-in 7-Way available for your truck. For a 4-Way you are correct, they do plug in-line with the vehicle tail light wiring. You can use # 118496. You would then install the ETBC7 which also includes provision to install a brake controller such as the P2 # 90885. I have included some links that show and explain the...
    view full answer...
  • 7-Way Trailer Connector for 2011 Toyota Highlander
    If all you are needing to do is provide lighting functions for the camper (directionals, running lights and brake lights) and if your Highlander already has a 4-pole trailer connector, you will only need a 4-pole to 7-way Adapter, part # 37185. If you do not already have the 4-pole connector, you will additionally need the T-1 Connector, part # 118449. If your camper has electric brakes, you will need a brake controller. I would recommend the Tekonsha Prodigy P2, part # 90885. The...
    view full answer...
  • Adding 7-Way Trailer Connector to 2014 Toyota Tacoma without Factory Tow Package
    It sounds like your 2014 Toyota Tacoma did not come with a factory tow package. What can happen sometimes is that on models that did not come with the factory tow package not all of the wiring or contacts will be present. You would either need to by all of the tow package parts or you would need to return the harness and install an aftermarket one designed for models without the factory tow package. If you want to add a 7-Way to the truck you would start by installing a 4-Way using #...
    view full answer...
  • Turn Signals and Running Lights Not Working with T-One Wiring Harness and 7 Pole Adapter Installed
    The first step that I would take to troubleshoot this issue is to sever the 12 volt power wire from the Curt 7 Way Adapter, # C57674, from the power wire of the Tow Ready 4 Way Wiring Harness # 118552. The 12 volt power wire from the Curt 7 way adapter should run directly to the vehicle battery via a 40 amp inline circuit breaker, # 9510. If you do not want to have to run another power wire to the vehicle battery, then you will want to install the 10 amp inline fuse from the 4-way harness...
    view full answer...
  • Recommended Wiring When Adding 7-Way Trailer Connector To 2016 Ford Escape
    First, I would recommend using part # 37185 instead of the # C57674 you mentioned because the test lamps on the connector can cause issues with the Tekonsha Prodigy RF Wireless Trailer Brake Controller, part # 90250. The best way to run the system is to connect the black wire from the # 37185 directly to the positive battery post for your 12V power on the 7-way. This prevents any issues with power draw and possibly performance problems with the lights on the trailer. I have attached...
    view full answer...
  • Does the Prodigy RF Brake Controller Need Brake Output and Reverse Lights Circuits to Work
    Since you are using the Prodigy RF brake controller # 90250 you will only need to have the 4-Way plugged into the adapter, the white wire grounds to the vehicle frame, and the black wire needs to have power because that is where the RF gets its power. The blue and yellow wires on the adapter, # C57674, will not be used for the RF. But if your trailer has an electric reverse lock out then you would have to attach the yellow wire to a reverse light wire on the vehicle The black wire...
    view full answer...
  • Options for Converting Factory 4-Way to 7-Way on 2014 Ford F-150
    The Curt Adapter, # C57674, is exactly what you will need to add a 7-way to your 2014 Ford F-150. Installation will be fairly simple, just connect the 4-way on the adapter to the 4-way on your truck and then connect the remaining wires to the corresponding wires on the back of the factory plug. Unfortunately a 7-way connector that will plug directly into the vehicle wiring is not available.
    view full answer...
  • Indicator Lights on Curt 4-Pole to 7-Way Adapter
    When fully installed, all the lamps would be lit as each function was activated. The BK or brake would not be lit, as you do not have a brake controller installed. The BU lamp would only light if the vehicle transmission were in reverse and that yellow wire was tapped into the circuit feeding the reverse lights on the vehicle. The 12V lamp would only light if the black wire was attached to the positive battery terminal. The 12-Volt circuit should be circuit protected using a 40 amp inline...
    view full answer...
  • Brake Controller Recommendation for 2018 Ford Edge Titanium with Tow Package
    There isn't a quick-install brake controller port on a 2018 Ford Edge Titanium with a tow package for installing a brake controller. In fact the only brake controller we offer that can fit the versions of the 2018 Ford Edge Titanium with the tow package and 7-way is the Prodigy RF part # 90250 which is a wireless controller that mounts on the trailer. Let me know when you pick out the Edge and what trailer wiring it has at the rear of it and what brake controller you'd like to install...
    view full answer...
  • Installing a 7-Way Trailer Connector with Test Lamps and Wiring for an Electric Brake Controller
    Instead of using the # ETBC7 kit you can use the Curt Adapter # C57674 with wiring # 5506. The wiring provides basically everything in the # ETBC7 except for the 7-way trailer connector itself. One thing to be aware of is some electric brake controllers will sense a trailer is connected all the time when using a 7-way that has test lights like the Curt. Because of this I recommend making sure you have a high quality brake controller like the P2 # 90885 or P3 # 90195.
    view full answer...
  • Why Would 12 Volt Power Circuit of 7-Way Tester be Active all the Time
    The 12 volt trailer accessory circuit of your 7-way is ran directly to the positive post of your battery which means this circuit is active all the time. This is why the light is on currently. To prevent this you'd need to install an isolation solenoid so that it only comes on when the vehicle is on. Now with that said whoever installed your brake controller did not install it correctly. The brake controller should have no affect on your vehicle brakes and if it does you need to have...
    view full answer...
  • Turning Off 12 Volt Trailer Circuit When Vehicle is Not Running
    With the small amount of power draw from the test light of the Curt adapter # C57674 it'll likely take months to drain your vehicle's battery. If I'm wrong, or if you just want the power to turn off with the vehicle the best way is to install a battery isolation solenoid, part # TR118665. This way the 12 volt power circuit on your trailer connector will only be hot when the vehicle is running.
    view full answer...
  • Where Does a Brake Controller Plug Into on a 2014 Toyota Tacoma
    Did your 2014 Toyota Tacoma come with a factory installed 7-Way trailer connector? If so the factory brake controller connector should be located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal. It is also possible that it is behind the kick panel adjacent to the emergency brake pedal. For a brake controller I recommend the P2 # 90885 because it is easy to set up and use and it is reliable. And you would use wiring harness...
    view full answer...
  • Curt Adapter # C57674 and Tekonsha Prodigy P2 and P3 Operation
    If you have the Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps # C57674 correctly installed then the 12V light will remain on as that is 12V of constant current going to the adapter. The way that the Tekonsha Prodigy P2 # 90885 and P3 # 90195 brake controllers work is that they have to have a trailer connected and there has to be movement for the inertia sensor to actually send output to the brake controller pin on your 7-Way when the brake pedal is pressed. The way to test one of...
    view full answer...
  • Brake Controller Install Kit Including Curt # C57674 4-Pole to 7-Way Adapter
    There is a way to get the kit you want using the Curt 4-pole to 7-way adapter, part # C57674. You'd to purchase the # 5506 install kit and the # C57674 separately. This would give you what is essentially the same kit, minus the zip ties, the circuit tester and the two quick splice connectors, part # 564.
    view full answer...
  • Troubleshooting LED Lights on the Curt Adapter to 7-Pole and 4-Pole
    On the Curt 4-Pole and 7-Pole Adapter, # C57674, the blinking LED light for the brake may have a short. I recommend having the company who installed the unit to check to make sure that the wire connection is secured. The wire may be loose and grounding out causing the LED to light on the adapter. As for the 12-volt LED, the circuit is wire direct to the battery and is live all the time.
    view full answer...
  • Adding a 7-Way and Brake Controller to a 2015 Ford Expedition with Factory 4-Way
    From what we have found the 2015 Ford Expedition that came with a factory 4-Way connector will need a little bit of hardwiring to install a brake controller and 7-Way connector. You will need # 37185, some wire (more on that later), a brake controller, and a brake controller wiring harness. The 37185 will plug into the 4-Way. Then you will ground the white wire to the frame. That will leave a blue wire, black wire, and purple wire. The purple wire is for reverse lights so if the trailer...
    view full answer...
  • How to Wire Up a Curt Brake Controller on a 2011 Chevy Silverado
    For a color to color application you will run the black wire from the brake controller to the red/black wire from your truck, the white wire from the controller to the white wire of your truck, the red wire from the controller to the light blue/white wire from your truck, the blue wire from your controller to the dark blue controller of your truck. I attached a picture of a chart to make this easier also. I also attached a video of a brake controller being installed on a similar 2011...
    view full answer...
  • Should the 12V Lamp Always be Lit Even when the Car is not Running and the Keys are Out
    The 12 volt power wire from your 7-way connector will always be hot if it was attached to the positive terminal of the vehicles battery, even with a 40-amp circuit breaker installed. To prevent your trailer from constantly drawing power from your vehicles battery, I recommend installing the Tow Ready Battery Isolation Solenoid, # TR118665, inline on the power wire. This will prevent your vehicle battery from draining when a trailer is connected. I have attached a photo that shows how the...
    view full answer...
  • What do the Codes for the Test Lamps Mean on CURT Adapter 4 Pole to 7 Pole and 4 Pole # C57674
    On the CURT Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps, # C57674, the test light codes are as follows: 12V = 12 volt hot lead BK = output from brake controller (if no brake controller is installed, this light will not light up) BU = reverse lights (if this circuit is not connected on the vehicle it will not light up) RT = Right Turn TM = running lights (tail/marker lights) LT = left turn
    view full answer...
  • Recommended Wiring For 4-Way To 7-Way Trailer Wiring on Ford Explorer
    To adapt your current 4-way flat trailer connection to a 7-way using the Curt Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps # C57674, you will also need to use the wiring kit for brake controller # 5506. This will give you a complete set-up like the # ETBC7 except with the added test light functions. The remaining wires on the Curt connector will be ground (white), 12V power (black), brake controller output (blue), and reverse lights (yellow). Then you will simply need to add a...
    view full answer...




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality wiring for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate wiring information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Test Fit:
Joe V
Test Fit:
Nicholas E
Test Fit:
Colin H
Test Fit:
Andrew S
Test Fit:
Brent H
Expert Research:
Mike L
Expert Research:
Robert G
Expert Research:
Michael H
Expert Research:
Jeff D
Expert Research:
Jameson C
Expert Research:
John H
Expert Research:
Adam R
Expert Research:
Rachael H
Expert Research:
Jeffrey L
Video Edited:
Zack K
Video Edited:
Joshua S
Video Edited:
Jacob T
Video Edited:
Chris R
Video by:
Andrew K
Video by:
Dustin K
Video by:
Alan C
Video by:
Zach D
Updated by:
Adele M
Updated by:
Sarah W
Updated by:
Hannah L
Updated by:
Kristina F
Updated by:
Isabelle B
Installed by:
David F

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.