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4-Pole Trailer Connector Cover

4-Pole Trailer Connector Cover

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Accessories and Parts 20112 - 4 Flat - Tow Ready
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Call 800-298-1624 to order Tow Ready accessories and parts part number 20112 or order online at etrailer.com. Free expert support on all Tow Ready products. Guaranteed Lowest Price and Fastest Shipping for 4-Pole Trailer Connector Cover. Accessories and Parts reviews from real customers.
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  • Reviews (163)
  • Q & A (15)
  • Videos (1)
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  • Why etrailer?

Tow Ready Accessories and Parts

  • Wiring
  • Wire Protection
  • Connector Covers
  • Tow Ready
  • 4 Flat


  • Helps prevent problems caused by corrosion
  • Universal design
  • Fits either vehicle or trailer 4-Flat connector
  • Black
  • Installs in seconds
  • Soft flexible rubber construction
  • Elastic non-corrosive cover
  • Durable long lasting rubber
  • 1-Year limited warranty

85218 4-Pole Trailer Connector Cover

Replaces Tow Ready 18147 and 20112

Item # 20112

Installation Details 20112 Installation instructions



Video of 4-Pole Trailer Connector Cover

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




Video Transcript for Tow Ready Trailer Plug Covers - 4 Flat Cover - 20112 Review

Today we're going to review part number 20112. This is the Tow Ready 4-way Flat Connector Dust Cover. Now this dust cover will protect your 4-way vehicle end connector when it's not in use. This part right here will cover the terminals on your 4-way to protect from damage or the elements. It helps eliminate any corrosion problems with your electrical system. It's very easy to install.

I just want to give you an example. I pulled a sample. This is a vehicle end connector, 4-way vehicle end connector. As you can see it's a vehicle end because you can see three of the terminals will have the rubber coating on it and the ground terminal will be exposed. What you want to do is when you install this, on this very end you'll notice there's a hole and that is designed to go over the ground so you want to make sure when you put it on, just take this, drape it over the 4-way and then make sure this, if you see on the inside of the cap that very end where the hole is, it will go over the ground. Just flip it over, push it into place and you can see that it fully protects the terminals from any damage.

If it's dragging, you don't want terminals to get damaged. This will protect it from that and also from the elements getting to it. That should do it for the review on part number 20112, the Tow Ready 4-way Flat Connector Dust Cover. .


Customer Reviews

4-Pole Trailer Connector Cover - 20112

Average Customer Rating:  4.6 out of 5 stars   (163 Customer Reviews)


- 20112
by:

For the pricing on this product, it was a great solution to create a permanent mounting solution to secure the trailer wiring connector on my truck. I wasn't able to mount it to my bumper due to the way it was designed, but I was able to get it mounted to the trailer hitch frame itself on the truck. The bracket fits the connector plug like a glove, and combined with the connector cover, it looks very nice, almost like a factory job. My only complaint (and thus my justification for 4 stars instead of 5) with this is the Phillips head screws. I do not know why manufacturers continue to provide these with products that need securing, especially where driving them into a metal surface is highly probable. Please, please, please - update this package to include hex head screws where they can be driven with a nut driver socket on a drill. Phillips screws are very prone to stripping and a pain in the posterior to work with. I have mine secured now with the supplied screws, but I will be replacing them with hex head screws ASAP.


Comments
They have worked out well. I liked being able to mount the trailer connector to the bottom of the bumper and the connector cover was a nice + to protect the pins.
James - 11/27/2018



- 20112
by:

I have both a boat trailer and a utility trailer. I was tired of either using a wire brush or a Dremel tool to clean the oxidation from the contacts that accumulated due to them being exposed to the weather. I bought two of these covers and each one fit perfectly. I just received them today and installed them as I was walking back from the mailbox. Only time will tell whether they are durable but they otherwise seem to be exactly what I wanted.


Comments
Adding a bit of dielectric grease to the connectors will help out quite a bit. Just keep a little glob in that cover and it will keep moisture from getting to the the metal contacts.
-- Etrailer Expert Patrick B - 08/20/2013

Comments
The covers are holding up well and have reduced maintenance time on my trailer lights. A similar type of cover would be useful for the mostly female connector on my tow vehicle. I still have to use a round file to periodically clean those contacts.
Bob P - 02/17/2015



- 20112
by:

This cover does a great job of keep the electrical connections clean and corrosion free. I recommend this item.



- 20112
by:

Fits 4 prong connector well. Good thick quality rubber that will last. Important to keep moisture and road grim out of connector.



- 20112
by:

You don’t need this part for the project. Wiring harness comes with it.



- 20112
by:

Trailer connector cover still fits fine after 1 year of use.



- 20112
by:

Does exactly what it should



- 20112
by:

Great products! Fast shipping!



- 20112
by:

I use these on all of my trailers and vehicle wiring. It keeps dirt, water and snow from getting into the connections. I just got a new trailer and ordered several more of them. I highly recommend them to everyone!


Comments
Im still loving them after using them for several years. I have one on each of my three trailers and another on my car. Great product!
Toothdoc - 02/02/2015



- 20112
by:

I ordered several trailer accessories. all of them were true to the website pic and description. all items fit perfectly and serve their intended purpose. Just perfect!!!



- 20112
by:

Ordering was easy and quick The piece doesn’t fit as snug as I would like, but it will. Be fine. If needed I will zip tie it if it falls off



- 20112
by:

This would have been perfect for the 4-Pole at the truck end of the connection ( the female end). I, however, had purchased it with the idea in mind of using it as a cover for the male end ( the wire connections at the trailer coupler end). I had to cut-out a bit of the inside to get it to fit the male end but, it seems to fit snuggly enough. Especially since I will really only use it when the trailer is parked in the yard, then will remove it to hook-up to my truck when I'm trailing.



- 20112
by:

I bought this item to protect the end of the wiring harness on the trailer, since it sits outside 24/7. The end of the wiring harness on the trailer is rectangular with squared off corners and this connector cover is rectangular with rounded off corners. In order for this cover to fit, one must force it over the squared off corner connector. That eventually will make the end of the connector out of shape and will not fit properly into the connector that it mates with from the vehicle. Actually this connector cover is made to be used on the connector that comes from the vehicle which has rounded off instead of squared off corners. As far as I can see, etrailer does not sell a connector cover for the trailer connector. Maybe their website should specify that this cover only works for the vehicle end.



- 20112
by:

Thank you for your great customer service. When I ordered two of the trailer connector covers, you called me to confirm that I really meant to order two. I don't think no other company goes out of their way to please their customer as you do. Thanks again for you outstanding customer support.



- 20112
by:

really easy to install! the video e trailer has for this was a huge help. great product, looks like it will hold up well.


Comments
Thanks for checking in. The trailer hitch was great and held up fantastic. Only got to use it about 4 times, but it worked perfectly. The wiring harness matched perfectly and was a breeze to install. The SUV I mounted it on didnt have enough towing capacity for my new boat, so I ended up trading it in for a newer one that had a factory hitch pre-wired setup. So the hitch receiver and wiring stayed with the SUV upon trade in. I held on to the ball mounts and the other bars and have used them a bunch for towing and launching and they are working great.
OC - 09/28/2018



- 20112
by:

The product does what is should. The only minor issue I had was the molded material encroached into the ground-pin hole which prevented the cover from staying on once installed. A small bit of "carving" out the hole with a pocket knife opened it enough to stay on. All in all, it does what it should and isn't an eye-sore.



- 20112
by:

Weatherproofs your 4-way plugs (it will cover both "male" and "female" ends) in case your wires are exposed to the elements. I have replaced three plugs on one trailer due to corrosion. Much cheaper than building a barn for your trailer!



- 20112
by:

Inexpensive protection to prevent corrosion on the 4-Pole trailer pin contacts. With this cover your connector will always be clean and ready to make a corrosion free connection.



- 20112
by:

Easy to install. Very reasonable pricing. Important thing is it protects and keeps plug from undo corrosion with the help of dielectric cream. Thanks for caring a complete line of related products to keep us from running all over to find what we need.



- 20112
by:

I received the cover for the 4 flat wring that will be used when I receive the Reese Titan Hitch Box Extension. Thank you



- 20112
by:

Good idea to use this on the vehicles harness when it is not connected to the trailer harness, since there is power at the plug end when the lights are operating on the vehicle.



- 20112
by:

Very nicely made and seems like it will last, but it Does not fit on both vehicle and trailer, will only fit the normal smaller connector that all other covers I have tried will fit. I gave it a one, because I purchased it to fit the larger of the two connectors.



- 20112
by:

Is exactly what I was looking for. It has worked perfectly and the price for the product was fair, as well as the shipping. Thank You Roy S.


Comments
still working fine
Roy S - 01/25/2015



- 20112
by:

Robust material and quality with quick standard delivery


Comments
I purchased several in case of deterioration but havent needed to replace the first one.
Robert L - 08/18/2020


- 20112
by:

Just what the doctor ordered to protect our 4 way plug car connector. Good quality and good price.


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Show More Reviews

Ask the Experts about this Tow Ready Accessories and Parts

  • Availability of 5-Way Tralier Connector Cover
    We currently carry one 5-way cover, part # 20115. It also has an integrated LED Circuit tester that you can use to make sure the wiring on your vehicle is working properly.
    view full answer...
  • Will Trailer Connector Cover 20112 Fit 4-Way From Truck
    Yes, the 4-way cover part # 20112 that you referenced is going to fit the 4-way you have that you sent in a picture of.
    view full answer...
    Image 1 for
  • Can 4-Way Trailer Connector Covers Be Installed after the Wiring is Installed
    The 4-Pole Connector Cover, part # 20112, can be slipped over an existing 4-Pole connector. It does not have to be installed when the wiring is first installed.
    view full answer...
  • Availability of Cover for Ford Ranger 4-Way to Protect From Salty Winter Roads
    There are covers for a 4-Way connector to help keep the pins in good shape! I recommend using the Tow Ready # 20112 to help protect the pins on your 4-Way. If the pins are bad enough on the Ford Ranger then you can even cut it off and splice on a new connector like the Hopkins Endurance Easy-Pull Harness # HM48044 (which comes with a cover) with butt connectors # DW05744-5. Adding some dielectric grease like part # 11755 to the connectors occasionally will also help to keep the pins...
    view full answer...
  • Replacement Plug Cover for 4 Way Connector on Hopkins HM39531
    To replace the cover on the 4 way plug on your # HM39531 you can use the 4-Pole Trailer Connector Cover # 20112.
    view full answer...
  • 4-Pole Trailer Wiring Bracket
    From the back hatch area where your trailer lighting wiring harness is, you will need to find a place where you can pass your wiring through to the under side of your vehicle. You may have to drill a hole if an opening with a rubber stopper is not available. Once routed under the car you can locate a place you like to mount the Tow Ready # 18144 Mounting Bracket. You should also consider if Tow Ready # 18140 would be useful when mounting your bracket. If your wiring harness end does...
    view full answer...
  • Recommended Trailer Wiring Harness for 2001 Dodge Dakota
    For your 2001 Dodge Dakota, the Tekonsha T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118329 is a confirmed fit. Another option is the Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C55329 which is also a confirmed fit. Either of these options will plug into your Dodge Dakota's wiring harness, which is located at the rear, along the inside of the frame rail on both the driver's and passenger's sides. I recommend using mounting bracket...
    view full answer...
  • Will T-One 4 Pole Trailer Connector # 118341 Fit a 1999 Toyota 4Runner without Factory Tow Package
    The T-One Vehicle Wiring Harness with 4 Pole Trailer Connector, # 118341, is designed to fit all models of the 1999 Toyota 4Runner. It does come with installation instructions which I have linked to for you to review. The connection points are located behind the interior trim panels behind each taillight. The 4-pole trailer connector will be stowed in the rear cargo area when not in use. You may be able to route the 4-Way through the bottom of the cargo area and out under the vehicle...
    view full answer...
  • 4 and 5 Pole Trailer End Connectors
    We have trailer end connectors in both 4 and 5 pole configurations. Also, we do carry covers that can be added to 4 pole connectors and boxes that can be mounted on the trailer to store connectors in. We also have circuit testers that can be put in line with the vehicle and trailer or just plugged into the vehicle. The 5 way circuit tester, 20115, is an in-line model and should work for both 4 and 5 pole connectors. I have posted links below for your convenience.
    view full answer...
  • Towing Equipment for a 1982 Jeep CJ-7 Renegade
    If you are looking for a trailer hitch receiver and wiring for your 1982 Jeep CJ-7 Renegade then you have come to the right place. The Curt Class III Trailer Hitch Receiver # 13412 is a great option for a trailer hitch receiver that we have. It has a 4,000 lbs Max Gross Trailer Weight (GTW) and a 400 lbs Max Tongue Weight (TW). This hitch will require some drilling to install. When it comes to wiring for your Jeep you will have to do some splicing to get the appropriate connections....
    view full answer...
  • Troubleshooting Wiring on Boat Trailer With 1998 Ford F-150
    Before getting a new connector I recommend testing to see if the issue is the wiring. You'll need to use a circuit tester such as # 40376 to test the 4-way on your 1998 Ford F-150. Check the wiring going into your harness from your tail lights to see if those are correct, if not then the issue is with the vehicle wiring. If the signals going to your harness are okay, you'll need to test the signals coming out of the harness, and if they are correct then your issue is likely going to be...
    view full answer...
    Image 1 for
  • 4-Way Connector to Power Motorcycle Trailer Lights
    To power up the lights on your motorcycle trailer, you would want to use 20 ft. Wishbone 4-Way Trailer Wiring Harness with 30" Ground Wire # A20WB. This harness has all the wiring necessary to empower each of the lighting functions on your motorcycle trailer. I also recommend using wire loom # 459075-1 and ring terminals # 44-5310A to make the installation an easier process, as well as 4-way connector cover # 20112 to protect it from being damaged. I've added links to video reviews...
    view full answer...
  • How to Protect Trailer Wiring on a 2011 Subaru Forester from Winter Weather
    If the dealer does not have the exact part, you may be able to take the grommet with you to a hardware store where you may find something that will work in its place. I could not find an aftermarket grommet. It may be that the vehicle is still fairly new and that part is not yet available. Another option is to provide some protection for the wiring. For the actual wires, you can use a wire loom, # 39035. I would would go ahead and wrap the wiring in electrical tape for added protection. ...
    view full answer...
  • Recommended 4 Pole Flat to 7 Way Adapter
    I have a solution for your trailer, however it's not a direct replacement or a temporary adapter; it's more a permanent solution. I recommend part # e99011, and part # A10-4404VP. The junction box has all of your connections protected inside, so you can have both a 7 way and 4 way connector on the front of your trailer. Cut the 7 way connector off the trailer, and connect each wire into the junction box. The box will have a 7 way connector coming out. Then wire the 4 pole wiring into...
    view full answer...
  • Recommendation for Camping Trailer Receiver for Pulling Boat Trailer
    If your trailer's frame is between 18 inches and 51 inches on center, then I recommend the Curt RV hitch # C13702. This hitch is the strongest capacity we carry for tongue weights up to 500 lbs and a towing capacity of up to 5,000 lbs without weight distribution. It can bump up to 600 lbs tongue weight and 6,000 lbs max towing when using weight distribution. If your trailer frame is between 22 inches and 72 inches wide on center, then I recommend the Curt RV hitch # 13703. This...
    view full answer...

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Info for this part was:

Employee Patrick B
Expert Research:
Patrick B
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Isabelle B
Updated by:
Isabelle B

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