bing tracking image
  1. Trailer Wiring
  2. CURT
  3. Wiring Adapters
  4. Multi-Function Adapter
  5. 4 Flat
  6. 7 Round - Blade
Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat

Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat

Item # C57102
Retail:$61.67
Our Price: $40.23
You Save: 35%
Trailer Wiring
Shipping Weight: 1.37 lbs
Add to cart
In Stock
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

Customer Photos

Videos

Need help with installation?
Locate installers near me
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 an integrated backup alarm. Great Prices for the best trailer wiring from CURT. Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat part number C57102 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (60)
  • Q & A (0)
  • Videos (1)
  • Photos

CURT Trailer Wiring - C57102

  • Wiring Adapters
  • Multi-Function Adapter
  • 4 Flat
  • 7 Round - Blade
  • Plug Only
  • 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 an integrated backup alarm.


Features:

  • Connects to 4-way flat plug on your vehicle
    • Requires additional wiring for use of brake, power and accessory leads
  • Supplies 7-blade RV and 4-wire flat trailer connections
  • Sounds alarm when vehicle is in reverse
  • Constructed of durable plastic

Specs:

  • Yellow wire is for reverse lights
  • Blue wire is for brakes
  • Black wire is for 12 volt power
  • White wire is ground
  • 4-Way connector plugs into vehicle 4-way connector


57102 Curt Multi-Function Socket with Back Up Alarm - 7-Way RV Blade and 4-Way Flat - Universal Fit

Installation Details C57102 Installation instructions


California residents: click here


Video of Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat

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




Video Transcript for Curt Wiring - Wiring Adapters - C57102 Review

Man: Today we're going to be taking a look at Part Number C57102. This is a Curt Trailer Connector Adapter with a backup alarm. This is 4-way, the 7-way round and 4-way flat. The multi-function vehicle end connector is going to convert any 4-way flat connector vehicle end plug to a combination of a 7-way outlet which is going to be this portion right here. And a 4-pole flat outlet. It's also going to feature the integrated backup alarm and it's going to have three LED lights on there as well. This is designed to connect to a 4-way flat plug on your vehicle.

You're going to have the connection right here to make that appropriate connection. It is going to require additional wiring for the use of brake, power, and accessory leads. All of the brake or . excuse me. All the wires here included in the harness or the adapter are going to have the appropriate connectors on here.

You're going to have three of them that are going to have the butt connectors and then the white is going to be your ground and that's going to have the ring terminal on there that will need be attached with a self-tapping screw. So again this is going to supply your 7-blade RV connector right here as well as a 4-way flat trailer connector. It's going to have the nice dust cap that goes over the connection points to prevent them from any type of corrosion. And then on the 7-way connector it's got the nice spring loaded lid that's going to protect the connection points as well. Now this is going to be constructed of a durable plastic construction. It's going to come with a mounting bracket and the necessary hardware to mount the connector to the actual bracket. You will need the hardware to mount the bracket to the vehicle, that is going to be sold separately.

Through these holes right here that's going to connect using two number 10 half inch self-tapping screws. You can also use a number 10 half inch self-tapping screw to mount the ground connection with the ring terminal here on the end of the white wire. Now to go over the wire functions real fast with you, the yellow wire is going to be for the reverse lights. Your blue wire is going to be for the brakes. The black wire is going to be for 12 volt power and then your white wire is going to be for your ground connection and then you're going to have the four way connector that's going to plug into the existing vehicle 4-way connector. Once you have all those connections made, you're going to have full use of your 7-way connector right here as well as the 4-way flat connector right here. I'm going to show you how it mounts with the bracket.

Just run all the wiring through the slots there, feed your 4-way flat through there as well. Now the holes in the bracket are going to line up perfectly with the holes here on national connector. Now that's going to be able to mount to the rear of your vehicle. It's going to hold it place and you have a little area here on the side of the bracket for your 4-way connector as well so it's going to stay right there next to the 7-way connector. That bracket is going to hold it in place. So real quick I just want to go ahead and show you the function here of the backup alarm. I'm going to go on and make our necessary connections and then you can see how that operates. Sends out a nice strong signal. It's really loud. You'll be able to see the lights flash as well. I'm going to activate the reverse function (beeping sound). That's going to sound and flash anytime the reverse function is activated on your vehicle. That's going to do it for today's review of Part Number C57102. This is the Curt Trailer Connector Adapter with the built in backup alarm. .

Customer Satisfaction Score:


Customer Reviews

Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat - C57102

Average Customer Rating:  4.8 out of 5 stars   (60 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. Features an integrated backup alarm.

by:

I never used it. It does not fit my motorhome. Still sitting in my garage.

Etrailer Expert

Katrina D.

4/17/2024

I am sorry. Let me get you over to customer service for them to get a return issued for you.



by:

Perfect fit with easy installation inst ructions!



by:

Exactly what I was looking for. Easily connected to my existing 4-way without any additional wiring. The 7-way adapter bracket was the correct size, and the holes were pre-drilled for the right fit to connect to the existing bracket on the (U-Haul Installed) tow bar.



by:

Works great!



by:

Just received the 4-way to 7-way adapter and it is everything I had hoped it would be. Shipping was extremely fast and it arrived when you said it would. Thank you.

Charles Stanley



by:

Installed perfect .. love it

Jeffery

3/19/2023

Super



by:

Product is great. Guy on phone made it sound super simple. Now I have to go get the additional pieces and wires to hard wire it in…thought the phone rep should have been more thorough. “Oh, c’mon Jim. Don’t be afraid.” He said nothing about splicing, running wires, circuit breaker or anything.

Etrailer Expert

Sierra K.

7/7/2022

Sorry about that! This product uses at least 12 gauge wire and butt-connectors to connect the wires to the appropriate functions. Most of the time the colors are in this order but you may have to confirm the function with a circuit tester. Yellow for auxiliary or back-up lights, blue for electric brakes, white for ground, and black for positive power. If you do not need some of the functions, you can secure the wires up using cable ties.



by:

Just what I needed, easy to install. Excellent instructions. Good quality at a good price. etrailer, my go to place for everything "trailer/towing", Not my first purchase. Don't spend too much time shopping around, you'll be frustrated with the wasted time. Thanks



by:

Good product and install instructions.
The
only complaint is the 4 pin connector falls out of the housing.



by:

very well built, easy to install. made converting from 4 wire flat connector to 7 wire round an easy process.
I will use the 12 volt battery and the backup wire ,don't need the brake wire.



by:

good product.



by:

It fit perfect, and we pulled our camper to California from Ohio and back, no problems.



by:

Great product....easy wiring and mounting...works flawlessly



by:

LOVE/LOVE/LOVE "this" particular model= it has a "beep" warning alarm noise system when you are backing up! IT ALERTS! YOU-LOUD! AWESOME/much needed upgrade from what came with my vehicle.

by:

Easy installation



by:

Carlos

8/27/2022

Its working great pulling my Aliner with my Kia Sportage.



by:

I like what I see but unable to give an accurate review because I don't have it installed on my vehicle yet since I just got it this afternoon and had other projects in the process at the moment.



by:

Not an Easy hookup for my new Rubicon as stated.



by:

Installed and seems to work fine. Will put it to the test next spring.



by:

Great product for the price not to mention hella easy hook up thanks holly recommended



by:

My son got it on and works great. Fast service. Can not complain.



by:

Love it



by:

Great high quality at a very reasonable price .



by:

Product exactly as described. Shipped fast and in good condition.



by:

very satisfied


25
60
Show More Reviews

See what our Experts say about this CURT Trailer Wiring

  • Add 7-Pin to 2022 Hyundai Palisade with Factory Tow-Package
    Use the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package, # C68JR to quickly and easily install a 7-way, RV-style trailer connector on your 2022 Hyundai Palisade. This is a plug-n-play install but I do highly recommend, to keep the connector safe from corrosion and moisture you use a Dielectric Grease such as, # 11755. For a brake controller, I suggest the Curt Echo Wireless Trailer Brake Controller, # C51180 for 1 to 2 axles. Once the Echo is installed, it will sense -...
    view full answer...
  • Factory Trailer Wiring Harness Connection Point on a 2001 Toyota Highlander
    If your 2001 Toyota Highlander came with a factory tow package then there is a connection underneath. But if it did not come with a tow package the connector will either A) not be there or B) not be functional. On vehicles that have the connector it is located behind the rear bumper. On some, it is located behind the bumper and inside of a plastic box. Take a look at the instructions I have linked for harness # 118245 which should help you locate the harness if it is present on the vehicle. If...
    view full answer...
  • Does The Curt 7-Way Require a 12 Volt Charge Line To Be Connected When Brake Controller Isn't Needed
    When installing the Curt Trailer Connector Adapter with Backup Alarm # C57102 you will only need to connect the dedicated 12 volt power wire if your trailer requires a power wire. There are several trailers like small pop ups which tie into the 12 volt charge line to maintain power for a refrigerator or heating system and the trailer will not require the operation of brakes. With that said if the trailer has electric brakes you will need to have a controller like the Curt Echo # C51180...
    view full answer...
  • What Circuits Of The 7-Way Blade Connector Are Required To Use a Curt Echo Trailer Brake Connector?
    A reverse circuit wire is not required for the Curt Echo Wireless Trailer Brake Controller # C51180 to operate correctly. It only needs to get power form the charge line/auxiliary circuit of the 7-way and see signal from the brake lights (the brake lights are a combination of the left and right turn signals operating at the same time, because of this do not use your hazard lights with a Curt Echo installed). Your trailer will only require that the reverse lights portion of the Curt Trailer...
    view full answer...
    Image 1 for
  • Recommended Wiring Harness For A 2022 Volkswagen ID 4
    Though we do not have a custom wiring kit for your 2022 Volkswagen ID 4, you can use the Curt Powered tail light converter # C59236 that will provide you with a 4-flat harness. To get the 7-way round you will need to install the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat # ETBC7. Both harnesses mentioned are spliced in wiring. This is the only option that we have to get you a 7-way plug on your Volkswagen. You could also contact the dealership directly...
    view full answer...
  • Recommended Backup Alert for 2017 Ram 1500 Laramie Longhorn
    The Hopkins Backup Alert - Replacement 3156 Bulb with Audible Alert # HM20101VA is not a fit for your 2017 Ram Laramie Longhorn 1500 Crew Cab 4x4. For an audible alert you can use the Light-Duty to Medium-Duty Back-Up Alarm with Wire Leads # PK41822, the medium to heavy-duty # PK41851, or the integrated alarm in the Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat # C57102. Let me know if you need other options, but unfortunately we don't have a...
    view full answer...
  • Installation of the Curt Trailer Connector and Back-Up Alarm # C57102 on a 2001 Jeep Grand Cherokee
    Yes, you can connect the yellow wire of the Curt Trailer Connector and Back-up Alarm, # C57102, to the back-up light circuit on your 2001 Jeep Grand Cherokee. Connecting the yellow wire will allow the back-up alarm to activate when you put your Jeep in reverse.
    view full answer...
  • 2021 Hyundai Palisade 5-Pole Flat Wiring Harness Recommendation
    There are a couple of different ways to do this. The first step would be to install a 4 pole trailer connector using part # CU94FR. I've linked to an installation video. The easiest way to proceed from there would be to use an adapter like # 20036. The extra blue wire on the vehicle side would tap into the circuit feeding one of the reverse lamps using the provided quick splice connector. This isn't my favorite, as you'll have an adapter that you'll need to keep track of but if you don't...
    view full answer...
  • Where to Tap Into Reverse Light Circuit to Install Trailer Connector Adapter with Backup Alarm
    To wire in the reverse light wire on Curt 7-Way connector # C57102 for the back up alarm to work you will need to tap into a reverse light wire behind a reverse light on your 1999 Dodge Ram. If you do not wish to tap into the wire there then you can trace the harness to a more accessible location. Then use a circuit tester such as # PTW2991, to find the correct wire before tapping into it. Be sure that the white ground wire on the 7-Way is attached to the truck frame. Otherwise the harness...
    view full answer...
  • Parts Needed to Tow Trailer with 2014 Toyota Sienna
    To install the Prodigy P3 part # 90195 in your 2014 Toyota Sienna you could use the # 5506 and the # C57102 that you referenced and you'd be set. This would give you basically the same kit as the # ETBC7 except with the backup alarm. You wouldn't need the extra wire either. With transmission coolers the best option is to go with the largest one that will fit in the available space in front of the radiator. For example the part # D13503 measures 11" Wide x 8-3/4" tall x 7/8" deep and would...
    view full answer...
  • Does the Alarm Always Sound in Reverse on the Curt Trailer Connector Adapter with Backup Alarm?
    Any time your vehicle is placed in reverse, whether you are towing or not, the alarm will sound on the Curt Trailer Connector Adapter with Backup Alarm item # C57102. To have the same connector without the beeping sound you will want the Curt Trailer Connector Adapter item # C57672. This is the same 7-way and 4-way connector without the alarm. I have linked an installation video below.
    view full answer...
  • What are the Wire Functions of the CURT Trailer Connector Adapter, # C57102
    You are correct. On the CURT Trailer Connector Adapter, # C57102, the white wire is ground, black is for 12 volt power, blue is for brakes, and yellow is for reverse lights. The 4-Way would then just plug into a 4-Way trailer connector on the vehicle to provide the remainder of the lighting functions. Be sure to ground the white wire to the vehicle frame for the connector to function properly.
    view full answer...
  • Parts Needed to Install a Brake Controller and 7-Way in a 2012 Lincoln Navigator
    Yes, the Curt Trailer Connector Adapter # C57102 would be the correct part for you to use to convert your 4-way to a fully functional 7-way. You would just need to run the wires of the # C57102 to those leads. If there isn't a 12 volt power lead you will need to run a 10 gauge wire like part # 10-1-1 through a 40 amp circuit breaker like part # 9510. The brake controller we recommend the most is the Prodigy P2 Brake Controller part # 90885. This is the best selling controller on the market...
    view full answer...
    Image 1 for
  • Does Brake Controller Installed on Trailer Require Blue Wire to Be Connected on Tow Vehicle
    Since your trailer already has a brake controller on it you shouldn't need to connect the blue wire from the Curt Trailer Connector Adapter with Backup Alarm # C57102 so you should be able to just cap it off and be fine. I say "should" because any brake controller I've seen that installs on the trailer only requires the standard light functions along with the 12V power. If you can confirm what brake controller you have then I can double check the installation.
    view full answer...
  • Install a Curt Trailer Connector Adapter with a Backup Alarm on 2000 Chevy C3500 Cab and Chassis
    It is highly likely that there is an OEM pigtail wiring harness that you could plug the Curt # 57101 into on your 2000 C3500 Truck. The typical locations for this connection point are near the spare tire and also on the drivers side behind the rear tire on the frame rail. This connector will most likely have a dust cover on it and you should be able to remove the cover and the zip ties holding this to the frame and plug it directly into the connector on the rear of the Curt Trailer connector...
    view full answer...
  • Does Curt 7-Way with Backup Alarm Work on 2021 Hyundai Palisade
    Yes the Curt Trailer Connector Adapter with Backup Alarm # C57102 does for your 2021 Hyundai Palisade. It would plug into a 4-way that fits your vehicle like the part # CU94FR. You will need to do some hardwiring to install a brake controller like the Brake EVN part # TK63VR which I attached a link on this topic for more info on.
    view full answer...
  • Wiring Needed To Install A Curt Echo and Curt 7-Way With Backup Alarm On a 2016 Kia Sportage
    The first step will be completing the installation of the Curt Trailer Connector Adapter with Backup Alarm # C57102 on to your 2016 Kia Sportage. You will need enough 12 Gauge Wire # 12-1-1 to run from the 7-way to where you will be tapping into the battery 12 volt source. This is sold by the foot so remember to account for all the bends along your Sportage to get it to your battery source. A Deka Ring Terminal # DW05741-1 will help you to connect to your power supply. The best way to...
    view full answer...
  • Could 4-Way to 7-Way Adapter with Reverse Alarm Fit 2020 Honda Odyssey with 4-Way
    Yes if you wanted to use the # C57102 as a way to convert your 4-way to a 7-way and install the brake controller you mentioned. You will need wiring to run from the brake output of your brake controller to the blue wire of this adapter. We have 10 gauge wire for this with # 10-1-1 which we sell by the foot.
    view full answer...
  • Recommended 7-Way Connector for a 2013 Honda CR-V
    To add a 7-way connector to your 2013 Honda CR-V you will first need a 4-flat connector like item # 118561. This will control your trailer's lights if you do not already have one. The second harness you will need is the Universal Installation Kit for Trailer Brake Controller item # ETBC7. The kit includes a pre-wired 7- and 4-way trailer connector that mounts easily at the rear of your Honda with an included bracket. This kit is designed for use on a vehicle with an existing 4-way flat...
    view full answer...
  • How Does the Curt Connector # C57102 Wire Up
    After you plug the 4-way in from your 2006 Ford E-350 to the Curt Trailer Connector Adapter # C57102 you will need to run the rest of the wires as follows: The white wire will need to be grounded to a clean metal surface. The blue wire will go to the brake output signal of your brake controller. The black wire will go to the positive side of your battery through a 40 amp circuit breaker like part # PK54540 The yellow wire will run to the reverse light circuit.
    view full answer...
  • Trailer Wiring For A 2022 Nissan Frontier
    Although The Hopkins Plug-In Simple Vehicle Wiring Harness # HM43534 is not confirmed to fit your 2022 Nissan Frontier we do have the parts you will need! The Curt Vehicle Wiring Harness # C56225 will give you a 4 flat connector and will plug into your vehicle's wiring harness which is located beneath the rear of the vehicle, along the driver's-side frame rail. After the 4-flat connector is installed you will need The Curt Trailer Connector Adapter with Backup Alarm # C57102 will attach...
    view full answer...
  • What is the Blue Wire on the Curt C57102 7-way Connector with Backup Alarm Used For
    The blue wire on the Curt Trailer Connector Adapter with Backup Alarm - 4-Way to 7-Way RV and 4-Way Flat # C57102 is designed to be connected to the brake controller in your 2019 Jeep Grand Cherokee. If your Grand Cherokee didn't come with the factory tow package and you're needing to use a brake controller then you will need run a wire from the blue wire on the back of the 7 way up to the engine compartment and through the firewall into the cab of the vehicle. Once it's run through the...
    view full answer...
  • Universal Version of the Curt Trailer Connector # C57101
    The closest thing we have to a universal version of the Curt Trailer Connector # C57101 would be the Curt Trailer Connector Adapter # C57102. This adapter is designed to plug into a 4-way and then the other 4 wires would get run to where they belong. White to ground Blue to brake controller output Yellow to reverse light circuit Black to positive side of the battery
    view full answer...
  • How To Attach A Brake Controller To My 1999 Dodge Dakota Sport V4
    The Curt Trailer Connector Adapter with Backup Alarm # C57102 will work when setting up for a brake controller but you will also need to purchase The Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers # 5506. This kit includes all the additional wiring you would need to make The Curt Adapter # C57102 to run the brakes on your trailer. For your brake controller I recommend the Tekonsha Prodigy P3 # 90195. This fully proportional controller has an easy-to-read LED display...
    view full answer...


< Previous
12



Do you have a question about this Trailer Wiring?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Written by:
Lindsey S
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Updated by:
Amanda M
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B

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. Let us know if anything is missing or if you have any questions.