Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps
(307 reviews)
Price: $51.30
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Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps
Item # C57674
Retail:$61.40
Our Price: $51.30
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- Reviews (307)
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- Videos (9)
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CURT Trailer Wiring - C57674
- Wiring Adapters
- Multi-Function Adapter
- 4 Flat
- 7 Round - Blade
- Plug and Lead
- 4 Flat
- CURT
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
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.
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Customer Reviews
Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps - C57674
Average Customer Rating: 4.7 out of 5 stars (307 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.by: RenCan7302/09/2024
Not too difficult to install, but I would recommend using a car lift so you don't have to work from your back (review includes wiring harness and Brake Controller)
by: Dick02/23/2023
Very easy install. My truck had a precut hole in the bumper for the plug. I then hooked the spare 4 pole plug into a Reese Universal mounting bracket and mounted it onto the hitch.
by: Randall09/03/2023
Perfect . My new Subaru hitch has a flat plate to which the dealership attaché the 4-flat. I used “2 L-brackets” to accommodate the 90 degree bend of the adapter bracket.
by: Jordan09/13/2023
This harness works great for what it does. The biggest problem I have with it is that the wire harness coming straight out the back of the 7-pole connector are very stiff. If you're tight on space (like I was), this severely limits your mounting positions. Instead of being able to install this near the hitch receiver (like you see on most factory installs), I had to angle it in an awkward direction just to get it to fit. Maybe it's just my setup where the hitch comes down around the spare tire underneath the vehicle. This will work for my purposes, but if I were installing an aftermarket hitch & wiring again, I'd definitely avoid this, or at least plan ahead to guarantee there's plenty of mounting space for this.
by: Gurpreet02/13/2024
Your product have no use. Becauae of late delivery i have to pay installation twice because when i order it delivery date tou guys provide is not that qhen i get delivery. If i send it back i have to pay transportation. So i m stuck by pedering from your site.pay twice peicw for producy and twice for installation.
by: Lawrence L08/16/2017
I recently had a receiver hitch installed on my 89 Silverado and the wiring was merely zip tied to the safety chain connection. Well that didn't sit well with me. I wanted a more permanent wiring connection point. So I purchased your 4 flat to 4 flat and 7 way plug and installed it. So far so good. The installation turned out perfect and it looks good. The test lights are a great thing as well. I couldn't be happier.
by: Bill H.12/04/2016
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.
by: Richard Collette06/02/2013
The bracket was too wide for the OEM hitch and cover on a 2013 Highlander (see photo). I had to grind down part of the the bracket so it would clear the plastic cover. The top two mounting screws did not line up. I had to elongate one of the holes. The 4 pin connector merely slides into the side of the bracket, rather than fitting in like a grommet, so I'll bet it comes out one day. The wiring on the back of the 4 pin connector is visible when looking at the side of the bracket, making for a less than clean look.
by: Pokey5807/03/2017
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.
by: Andrew 09/17/2023
Great product. I like how the company waits a year for a product review for an honest rundown on how functions from sales to "in action" I have made previous purchases from this company and will continue because of quality, availability and sales staff assistance who are available when needed. If you pull any kind of trailer, you should try etrailer.
by: Janet09/08/2018
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.
by: Chris07/22/2021
Very quality product. Well built and easy to install. Had another manufacture's harness on my vehicle and after about a year, it was intermittent. The Curt harness is sealed in the back which is why I choose this one along with the builtin test lights. I would recommend this harness to anyone along with the great service at etrailer! I installed the harness on a 2016 Hyundai Santa Fe Ultimate.
by: Ralph C.09/19/2017
Installed and have camped for one season using this 7-pin connector. Works great. I did make one mistake, I didn't add a relay to break the aux power connection when my vehicle is not running so the aux power LED is always lit. Got a number of comments about that this season. Might have to add a relay...
by: Jerry10/17/2021
Install was simple. Plugs in, added my own wires for brake controller and constant 12v. Works 99% great. When trailer is hooked up up, works perfect. Except, when I I unplug the trailer the test lights mess with my brake controller. The LED somehow is still inline with the circuit, well because it is a test light. I snip my blue wire going into the harness and my brake controller works perfectly when I unplug it. Have to switch over to the same adapter harness that does not have the test lights.
I am using a redarc tow pro v2. I get the flashing red light about 10 seconds after disconnecting the plug. In my case the error list this as a faulty ground on the trailer. I don't get it because it is unhooked? Regardless I wired the controller and adapter harness ground all the way to the battery itself. Still didn't change a thing. I even called redarc tech support in Australia. I never did tell them about the test LED's though, maybe if I did they would have went a different direction with the diag. They helped the best they could. I don't fault the person I talked to at all. I would guess the test lights on the adapter to be wired in parallel to work. With that thought, after unplugging the trailer, the brake controller must still be seeing the LED test light. I'm not an electrician/engineer but the small led of a test light, maybe not enough resistance overall to think a trailer was hooked up, but enough to throw a fault. If I was to break/damage the test led for brake, I would bet that it would most likely would work fine as it would cause an open in the circuit.
Jenny N.
11/1/2021
Thank you for your feedback. We had heard of this happening with the adapter and reached out. There has been a design change with the adapter to eliminate this issue.
Jerry
10/18/2022
Apadter works great sitting on my shelf. Installed the same style adapter that doesnt have test lights. Brake contoller works as designed.
by: James10/30/2022
Looks pretty good well made we'll see what happens when I install the system.
James
10/31/2023
Its working great. No problems so far.
by: Allen03/18/2018
Last project built. Used etrailer for almost all parts, including the 7 pin wiring harness. Friend wants one now so started another one. I will be getting all the parts from etrailer...
by: Eddy03/05/2013
Great product! Sturdy and weather-proof connections and wires! Easily installed. Thanks Curt and etrailer.com for an awesome item!
by: Christian03/01/2019
Shipped out very fast and arrived before the estimated arrival date.. install was super easy with the LED test lights.
by: Javier 03/09/2023
Hitch & electrical harness installation instructions were accurate. Complete install took 2 hours. Job well done eTrailer.
by: Jason A02/21/2017
I bought this for my '68 GMC 3/4 ton, which is in really nice shape so I wanted a clean install. The hitch was pretty easy to fit - I had to drill holes in the frame but I knew that going in. I especially liked the built-in bracket for mounting the trailer plug, worked great with a Curt combo 7 pin / 4 pin adapter from eTrailer.
Good product, great seller.
by: 11/06/2023
Exactly what I needed.
by: Chris C.06/04/2014
2013 Dodge Durango
Looks great. Nice and clean installation.
by: Grant09/19/2020
I was surprised at how sturdy this installation is. etrailer sure helped me out along the way with this installation. Special thanks to Alex J for his help on several occasions to help me get the right hitch and accessories for my new 2021 Hyundai Palisade Calligraphy.
by: Daniel10/22/2016
Great product for a great price, it's worth mentioning though that the 7 blade and 4 blade conections don't mount side by side unless you use the supplied bracket, mounting it through a flat spot on the bumper Wil leave the 4 pin connector hanging behind where you still have to crawl underneath to hook up a small trailer. But the LED lights are absolutely awesome to have and have labled.
Daniel
10/22/2017
Still works great, and the led lights are still the best feature
by: Dan S.06/16/2014
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...
Aldo
6/27/2014
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?
Daniel S.
6/30/2014
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.
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See what our Experts say about this CURT Trailer Wiring
- Will Curt Wiring Harness Fit With Draw-Tite 7-Way Mounting BoxBoth Curt wiring harnesses, part # C57674 or # C57672, will fit with the Mounting Box # 18159. The only problem is that these also come with 4-Way connectors as well which the mounting box doesn't have provisions for. I recommend using the Curt Wiring # C57674 along with the No-Drill Mount Bracket # C57202 which uses a similar strap to mount around the crossbar as the mounting box does. The difference in this case is that the bracket that comes with the Curt wiring is designed to accommodate...
view full answer... - Recommended Wiring When Adding 7-Way Trailer Connector To 2016 Ford EscapeFirst, 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 # TK94FR. 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...
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view full answer... - Troubleshooting Trailer Taillights that Stop Working When Brake Pedal is DepressedThis sounds like a ground issue. Ground problems normally show up when there is more draw on a system such as when you have the running lights on and then use another function like a turn signal or brake light. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal...
view full answer... - How to Order Everything Minus 7-Way Adapter of # ETBC7We have a kit that includes everything that comes with the # ETBC7 minus the 7-way adapter that you already have. For that all you would need is the # 5506. Since it looks like you have a 2010 Ford Escape I attached an install video for the # ETBC7 on a similar 2011 Ford Escape. For a brake controller I would recommend the Prodigy P2 Brake Controller part # 90885. This is our best selling brake controller because of how well it works and how easy it is to setup. This is a proportional...
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view full answer... - Does Pollack 7-Way Fit Into Curt 7-Way Connector # C57674The Curt 7-way part # C57674 that you referenced does work with a Pollack 7-way as they are both designed to fit the standard 7-ways found on RVs, trailers, etc. The hitch step you mentioned though was discontinued a few years back.
view full answer... - Can Curt 4 Pole to 7 Pole Adapter C57674 Be Installed On A 2005 Honda Pilot?The Curt Adapter 4 Pole to 7 Pole # C57674 you were looking at is a universal part that plugs into a 4-way connector so you will still need to install a 4-way connector # 118336 on your 2005 Honda Pilot. If you are just needing the lighting functions of the 7-way then this would be a perfect option, but if you need the brake output and 12v power circuit for your trailer then you would be better off with the # ETBC7 as it includes the wiring and circuit breakers required for the install. To...
view full answer... - Will Trailer Turn Signals or Brake Lights Work With Trailer Running Lights Turned On?Yes, if you install the Curt 4-way to 7-way Adapter # C57674 and the Tekonsha T-One Connector # 118336 you will have the trailer running lights come on at night when your headlights are turned on, and your turn signals and brake lights will still work just fine. The running lights are a dimmer light so the brake lights and turn signals will still be visible when turned on. The # ETBC7 you mentioned will function the exact same way with the main difference being it includes wiring and...
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view full answer... - 4-Pole to 7-Way Adapter for Installing Curt C51180 Echo Brake Controller on 2019 Toyota HighlanderThe Curt # C57674 would indeed be compatible, but I'd recommend using the # ETBC7L, which in addition to the adapter, also includes all the wire, hardware and the circuit breaker necessary to install the # C51180 Curt Echo on your 2019 Toyota Highlander. I've linked to a video showing the Echo being installed on a 2019 Highlander, as well as to a video explaining how the Echo works.
view full answer... - Troubleshooting Brake Lights that Come On When Trailer Connector is GroundedSounds like your brake light is wired to your 12 volt power source or is shorting out to it and because of that it is illuminating whenever the circuit is complete by connecting the ground. I would inspect the wiring, particularly between the black wire and the stop/turn signal wire that is illuminating for cut or exposed wire and fix as necessary. I attached a couple helpful FAQ articles for you to check out also.
view full answer... - 12 Volt Warning Lights Stays on After Install 4 to 7-Way Converter on 2015 Honda CR-VThe 12 volt circuit is supposed to be always active on the 7-way after it's wired. If you are experiencing some other problem let us know and we will do our best to come up with a solution.
view full answer... - Troubleshooting Curt Venturer Trailer Brake Controller InstallationThe LED test lights on the Curt Adapter # C57674 are very sensitive and can illuminate with even very little power reaching them, including the tiny voltage that brake controllers send out to confirm that the brake circuit is connected. This low-level signal from the controller is a pulsed signal, meaning it continuously goes on and then off, to verify that the brake circuit is intact. If you have a voltmeter like # PT89ZR you can test the actual voltage at the 7-way's brake circuit. The...
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view full answer... - Gauge Wire Used for the Yellow Wire of the Adapter 4 Pole to 7 Pole and 4 Pole C57674The yellow wire of the # C57674 that you referenced is 12 gauge. This is the circuit that commonly carries the reverse light circuit.
view full answer... - Can Second Trailer Have Trailer Brakes Activated as WellSounds 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... - Recommended Vehicle Side Adapter from 4-Way Flat to 7-Way Trailer ConnectorFor your adapter, I recommend the Curt Adapter 4 Pole to 7 Pole and 4 Pole w/Test Lamps # C57674. This will allow you to simply plug your 4 way trailer connector into the adapter and mount the adapter with the bracket. You don't need to connect the other wires except the white ground wire. If you choose to connect the other wires, the yellow goes to your reverse light function, the black to your battery for 12V power, and the blue to an electric brake controller output. If you choose...
view full answer... - Indicator Lights on Curt 4-Pole to 7-Way AdapterWhen 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... - Does Connection of 4-Pole Harness to Adapter C57674 Include Additional Trailer CircuitsCurt Adapter # C57674 is designed to plug in to an existing functional 4-pole wiring harness to convert the 4-pole's lighting signals into the 7-way connector format. Plugging in the 4-pole from your vehicle will allow those same stop/turn/tail lighting signals to pass through to the electrical contacts in the 7-way to allow a trailer with a 7-way plug to receive them. If you refer to the linked photo of a 7-way socket you can see the usual arrangement of functions. The pigtail leads on...
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- Installing a Brake Controller on a 2014 Toyota Tacoma that Did Not Come with Factory Tow PackageYou will need to do a little hardwiring to install the P2 brake controller # 90885 on your 2014 Toyota Tacoma. You already have most of the parts so the only thing left is installation kit # 5506. This is needed because the vehicle did not come with the factory tow package so the wiring is not present from the front of the vehicle back to the 4 to 7-Way adapter you have installed. Use the wire included with kit # 5506 to attach the brake controller blue wire to the blue wire on the adapter,...
view full answer... - Adding a 7-Way and Brake Controller Wiring to a 2011 Ford EscapeBecause you will need some additional parts to complete the installation of a brake controller and 7-Way I recommend using installation kit # ETBC7 so you won't have to add a bunch of additional wiring, connectors, circuit breakers, and other parts like you would if you used # C57674. The ETBC7 kit comes with everything you will need. I have included some links that show and explain the installation for you.
view full answer... - Two Ways to Install a Trailer Brake Controller on a 2008 Dodge Ram 1500 with Factory 4-Way WiringThere are 2 ways you can install a brake controller. On a 2008 Dodge Ram with a factory 4-Way, we usually recommend a hardwire installation using a 4 and 7-Way installation kit # ETBC7. It includes an adapter that is just like # C57674 but it also comes with everything else you will need to complete the installation of your P2, # 90885. However, there is an alternate method which I will also explain after the ETBC7 explanation. The 4-Way on your truck has the lighting functions for a trailer...
view full answer... - Replacement 7-Way Connector on 2008 Toyota TacomaFor a replacement 7-way on your 2008 Toyota Tacoma, we have the replacement you need. Which one you want will depend on your current fit. If you have a 7-way that has the round US car connector, then I recommend the Hopkins Replacement Custom Multi-Tow 7-Way and 4-Way Trailer Connectors # 30955. If you have a hardwired connector, then I recommend the Hopkins Endurance 7-Way Trailer Connector Socket - Vehicle End - Ergonomic Design # HM48480. If you have the 4-way to 7-way adapter,...
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Lawrence L.
8/16/2018
Perfect. The only issue I had was the 4 flat didn’t stay in the bracket but that was easily remedied with a couple of holes and some safety wire. Other than that I’d say u have one of the best setups you could ask for.