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Hopkins 7-Way Molded Trailer Wire Connector - 11' Long

Hopkins 7-Way Molded Trailer Wire Connector - 11' Long

Item # HM20048
Our Price: $51.93
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Trailer Wiring
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Shipping Weight: 3 lbs
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This molded, 7-way, RV-style, trailer-end connector lets you replace a damaged wiring harness on your trailer. Great Prices for the best trailer wiring from Hopkins. Hopkins 7-Way Molded Trailer Wire Connector - 11' Long part number HM20048 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (120)
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Hopkins Trailer Wiring - HM20048

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Blade
  • Plug and Lead
  • 11 - 20 Feet Long
  • Hopkins

This molded, 7-way, RV-style, trailer-end connector lets you replace a damaged wiring harness on your trailer.


  • 7-Way trailer-end connector lets you replace a damaged wiring harness on your trailer
    • Pre-wired to ease installation
  • Molded to protect wires from corrosion and abrasion


  • Cable length: 11'
  • Wire gauges:
    • 14 Gauge - brown, red, green, and yellow
    • 12 Gauge - blue
    • 10 Gauge - black, and white

Wiring Code
Molded Connector (HM20048) Function Usual Trailer Wire
White Wire Ground White Wire
Black Wire 12 Volt (Hot Lead) Black Wire
Green Wire Tail Lights Brown Wire
Brown Wire Right Turn Green Wire
Blue Wire Brake Power Blue Wire
Yellow Wire Reverse Purple Wire
Red Wire Left Turn Yellow Wire

20048 Hopkins 7-Way Molded Trailer Wire Connector - 11 Feet Long

Same as 20248

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins 7-Way Molded Trailer Wire Connector - 11' Long - HM20048

Average Customer Rating:  4.8 out of 5 stars   (120 Customer Reviews)

This molded, 7-way, RV-style, trailer-end connector lets you replace a damaged wiring harness on your trailer.


I liked the Product at first but 1 day short of a year later the cord outer jacket has separated from the plug itself rendering it completely exposed to the elements. Cord does not have a 1 yr warranty. I will not be reordering this cord. Hopkins is always my go to for trailer wiring components but no longer will be for 7 way pigtails. Cord has never been abused in any way and only gets light use.


Just what I needed for my new truck to plug in cabover camper. Did not want to pay to have it done and was pretty easy to install myself. Saved a few bucks!


Wasn’t wired correctly and cut off the female end and used another connection to make it work properly

When wiring the Hopkins connector you will want to make sure that you are wiring for function and not solely basing it on color. Be sure to utilize the chart on the product description page for the functions and colors of the harness.
-- Etrailer Expert Jenny N - 09/22/2022


Perfect for rewiring a 26 year old utility trailer


the center prong sticks out a little not allowing it plug in all the way on one of my trucks


Great option for a trailer connector. Used it to upgrade my older slide in camper. Flexible yet sturdy.


Only issue I had was one of length. I drop my plugs down the stem, and run them back along the gooseneck. This usually means that I use a 15-20' connector. I mis ordered this one, and "made due" the build quality is superior with molded and strain protected wiring in the connector


Just got it. Ordered several times from etrailer. Never once had any problems. Just exactly what I wanted.


Quality heavy duty cable and connector


Very easy to use and durable, with the plug moulded into the cord.


Ordered this a year ago for a home made trailer I built. It has worked flawlessly with no problems. I will not hesitate to buy this product again. Thanks etrailer


Great replacement. Not happy that the final stage of delivery was by the post office instead of UPS as that added another day.


Fast shipping


As always the products from arive quickly and are excellent products. I always go to etrailer first knowing I will get the best product and at the best price. The Hopkins 7-way trailer wire connector is top notch. The rubber is pliable and the fitting itself is of top quality. Thanks again for the great and timely service. ,Wayne

My 7 wire connector works as well today as the first day. Excellent quality as always from
Wayne H - 08/27/2018


The wire works as expected, bu BEWARE, the wire colors are not standard. etrailer should attach a notice with the shipment. The brown wire goes to green, the green wire to brown, the red to yellow, and the yellow to the backup light (purple).
I wish I'd realized that BEFORE I installed it and trimmed the wires inside my wiring block!!

Fortunately, because I don't have a backup light on the trailer, I could move all wires left by one post, so that the wire lengths still worked. Otherwise, it would have caused real problems.

Sam B~~Thanks for your comments. There are two standards in the industry for 7 Blade cables. The standard that this product is wired to is the RV standard. The second standard for the 7 Blade cables is newer than the first but is becoming more popular. We do manufacture 7 Blade cables to both of these wire color standards.
Hopkins C from - 08/22/2017


Used this on my Arctic Fox TT to replace the original pigtail which never properly fit the Hopkins connector on my Toyota Tundra. This one is the real deal, much better mechanical and therefore better electrical connection. Not overly tight, yet snug and secure. Should have installed this years ago! Highly recommended.


Very high quality. It's been outside fur a year, and looks brand new.

Holding up very well. Its been out in the weather all year, and looks new. Nice long lead.
Neil W - 11/24/2021


I used this product to update/repair the rather shabby OEM wiring harness. It worked perfectly. I love etrailer!

Still working perfectly
David M - 06/25/2019


Well built and works very well highly r ecommended

i did a complete rewire and added brakes to frt axle and after towing quite a few thousand miles to catch fish i would do it again
Jim m - 08/05/2017


I purchased a female ( TRAILER SIDE) wiring harness and a wiring connector box for connecting the trailer body wiring and trailer plug. This combination works perfectly with my 8 TON goose neck trailer an one ton dual wheel truck. I use Hopkins wiring connectors and accessories on all my farm equipment. and have been very satisfied with them.


The service is beyond excellent. I appreciated the call conserning the brakes. Most places would have made me wait until the part was back in stock. You advised me whst you had to replace it. Great customer service


Not my first order from etrailer and definitely not my last. My only complaint would be in the packing of small or fragile items loosely in a box with heavier items. One of the trailer light mounts was broken when it got here. No other issues though.

We do our best to package our orders so that they will arrive to you in good condition. I will send this to our shipping department manager for review.
-- Etrailer Expert Laura E - 07/15/2017


Looks like it will work great.


Quality product. Nice heavy gauge wire for the power, ground, and electric brake circuits. The only complaint I have is the unique (non standard) color coding of the individual wires. This would be so much simpler if they used industry standard color coding on the conductors in the cable.

AL B~~Thanks for your comments. There are two standards in the industry for 7 Blade cables. The standard that this product is wired to is the RV standard. The second standard for the 7 Blade cables is newer than the first but is becoming more popular. We do manufacture 7 Blade cables to both of these wire color standards.
Hopkins C from - 08/22/2017


the wire colors do not match brown was for left turn signal the only two wires that are right are the white and blue so if you purchase this product make sure you
check it first before you wire it in or you will cut it off and rewire it

There is more than one accepted wire color code convention for a 7-way trailer connector, which is why we list the wire color code in the product description above.
-- Etrailer Expert Mike L - 09/10/2018

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • What is the Diameter of the Cable on Hopkins 7-Way Molded Trailer Wire Connector # HM20048
    On the Hopkins 7-Way Molded Trailer Wire Connector # HM20048 the outer diameter of the cable is 5/8 inches. On the inside the red, green, yellow and brown wires are 14 gauge, the blue wire is 12 gauge and the white and black wires are 10 gauge.
    view full answer...
  • 7-Way Plug and Lead Recommendation for a Trailer that has a 5-Way Installed on It
    So you have a tow vehicle that has a 7-way connector on it and then a trailer that has a 5-way? What you would need to do is remove the 5-way wiring and install a 7-way with a lead like part # HM20048 which is a 7-way with 11 feet of harness. I attached a picture that has a diagram that has how a 7-way normally wires to a trailer.
    view full answer...
    Image 1 for
  • What Would Cause Constant Power To Electric Brakes
    I would first recommend checking to see if the breakaway pin is still intact. If the pin has not been pulled, you will want to begin by checking the trailer connectors for dirt or corrosion on both the inside and outside. Once the breakaway pin and trailer connectors are checked, you will need to start tracing the wires back from the trailer connector while checking for breaks or frays. I would agree with your suspicious that you have a short somewhere on the 12v wire on the trailer's...
    view full answer...
  • What is Function of Black Wire on Trailer 7-Way part # HM20048
    The black wire of the Hopkins 7-Way Molded Trailer Wire Connector # HM20048 carries the 12 volt accessory circuit. This is the circuit that will typically power interior lights or charge a trailer's battery. I attached a help article that covers trailer wiring for you to check out as well.
    view full answer...
  • What Does Black Wire In Hopkins 7-Way Molded Connector HM20048 Do?
    The black wire on the Hopkins 7-Way Molded Trailer Wire Connector - 11' Long # HM20048 you were looking at is for the 12v power circuit that typically gets used to trickle charge an on-board battery, or for powering an electric trailer jack. If you do not have any accessories on your trailer that use the 12v power from the tow vehicle you can just leave the wire taped up or in the junction box un-used. I included a video of the # HM20048 for you to take a look at.
    view full answer...
  • How Long Should Trailer Wiring Stick Out Past The Trailer Tongue?
    Typically, you want between 16" and 24" of wire to extend past the trailer tongue but it really depends on your particular vehicle and the location of the trailer plug on your vehicle. You want enough wire so that there is not tension on sharp turns, but you don't want too much slack as this could lead to the wires dragging on the ground. Since your 2012 Ford Super Duty has a 7 way connector, you can go with something like Hopkins 7-Way Molded Trailer Wire Connector - 11' # HM20048 which...
    view full answer...
  • Does The Black Wire On My Hopkins 7-Way Power My Running Lights
    The Hopkins 7-Way Molded Trailer Wire Connector - 11' Long, part # HM20048 is for a 12v circuit. This is the accessory circuit. Oftentimes it is used to charge a trailer's battery. The green wire on this connector is what powers the running lights. I have included a weblink to our section on wiring and a frequently asked questions link to 7-way connector wiring below.
    view full answer...
  • Troubleshooting Trailer Lights Not Functioning On a 1988 Fleetwood Trailer
    It sounds like you may have a damaged wire or connection inside your 7-Way Molded Trailer Wire Connector # HM20048 or vehicle side connection. To test this run a jumper wire from a ground connection on your 1988 Fleetwood trailer directly to a ground connection on your 2006 Lexus Rx 400h. This will determine is there is an issue with that portion of wiring or the connector. If you have another trailer with a 7-way or vehicle you can also try them on your trailer and Lexus to determine...
    view full answer...
  • Does Black Wire on 7-Way Go To 12V Power
    Typically the black wire on a trailer 7-Way like the Hopkins # HM20048 is for 12V power. It will run from the positive battery terminal on your tow vehicle back to your trailer battery or whatever you're needing to power (like interior lights). With that being said there are a few things I want to clarify before you start making connections; you'll need to charge your tow vehicle battery with an alternator - not the trailer battery (that seemed like what you're doing with how you worded...
    view full answer...
  • Wiring Code For Hopkins 7-Way # HM20048
    When installing The Hopkins 7-Way Molded Trailer Wire Connector # HM20048 on your 1984 Chevrolet C/K Series Pickup the black 12 Volt hot lead will have to be used in order for the brakes to work. I have attached the wiring code below: White Wire - Ground Usual Trailer Wire White Black Wire - 12 Volt (Hot Lead) Usual Trailer Wire Black ( The black wire for a traditional brake controller that ports doesn't necessarily need to be active for it to work) Green Wire - Tail Lights Usual Trailer...
    view full answer...
  • Why Would 7-Way Unplug While Towing with a 2015 Chevy Silverado 1500
    Are you sure you don't have a long enough trailer wiring harness? We haven't had any issues with 7-ways pulling out of the # HM40975 that is the same connector as what you have on your 2015 Chevy Silverado. That makes me think you just may have too short of a harness. Plus, we don't offer a 7-way that will fit the opening on your vehicle that opens up instead of down. For an 11 foot 7-way plug and lead you would want the part # HM20048.
    view full answer...
  • How Does the Electric Trailer Jack # JET-5000 Wire to a 7-Way
    The Stromberg Carlson Electric Trailer Jack - Drop Leg - A-Frame - 23" Lift - Item # JET-5000 that you referenced only has one wire that runs from it, the power wire. This wire would need to get run to the 12 volt accessory circuit of the 7-way on your trailer's wiring. The jack grounds through the mounting hardware of it so you would not have to run a ground wire. If you only have a 4-way on your trailer you will need to upgrade that to a 7-way like the part # HM20048. I attached a wiring...
    view full answer...
    Image 1 for
  • How to Prevent a 12 Volt Power Circuit on a 7-Way from Being Active All the Time
    What most people use to allow the 12 volt charge wire from being hot all the time and only when the key or the vehicle is on is an isolation solenoid part # TR118665 on the charge wire. You basically run the center pin to a keyed power source and then run one side of the solenoid to the 7-way and the other to the wiring of the truck. If you were wanting to install it on a 4-pole connector that was used strictly for that circuit that is possible too. This wouldn't work through a 7-way...
    view full answer...
  • How To Install New Trailer Wiring On A 2015 18 Foot TWF Trailer
    The wiring of your 7-way connector on your 18' TWF trailer will depend on what standard you are using for your 7-way connector on your 2020 GMC Sierra 1500. This 7-way connector matches your vehicle's wiring. I recommend the Hopkins 7-Way Molded Trailer Wire Connector - 11' Long, part # HM20048. The wires are molded to protect from rust and corrosion. This wire connector has three different wire gauges to match the different currents. I also recommend using dielectric grease, part # 11755,...
    view full answer...
    Image 1 for
  • Getting Side Marker Lights to Function as Turn Signals and Running Lights
    Trailers use what is called a 2-wire system which means the turn signals and brake lights are on the same circuit. When you try to add separate amber turn signals you will need to separate out the brake light signal using a converter, # 118158. On this converter the yellow input wire is for the combined left turn signal and brake light. Green is for the right turn signal and brake light. White is ground. On the output side the yellow wire will be left turn signal only, green is right turn...
    view full answer...
  • Recommended SAE Wired 7 way Trailer Plug
    You can wire the Hopkins 7 Way Molded Trailer Plug # HM20048 in whichever manner you see fit- the colored wires in the loom are color coded to make it easy for you to know which pin/blade they're connected to, so you shouldn't need to disassemble but just connect the wires from your trailer circuits to whichever color wire corresponds to the pin you want. You shouldn't need to cut anything or disassemble the cord as much as just change which wires you connect to which circuit. If you're...
    view full answer...
  • Replacement Axle with Brake Flanges for Rockwood Pop-Up Camper 1940 LTD with 12-Inch Wheels
    We do indeed offer complete axle kits that include the axle beam and spindles, electric brake assemblies, hub/drums along with bearings, races, seals, etc but we just do not happen to have a complete 2200-lb kit that will fit your 12-inch rims so we can help you select individual parts. You have the option of having brake flanges welded to your axles (by a certified welder) that would allow you to install drum brake assemblies and new hubs/drums. The linked article describes the items...
    view full answer...
  • Parts Needed to Convert 10 Inch Hydraulic Trailer Brakes to Electric Brakes
    The first thing to check are the drums. Some drums can be used with both electric and hydraulic drums but not all of them. It may indicate if they work with both on the actual drum. If you are not sure then it is safer to also replace the hub and drum assemblies. I will cover that below. If the drums are compatible with electric brakes then the 10 inch etrailer brakes, # AKEBRK-35-SA, will work if the brake mounting flanges the brakes attach to have the 4-bolt mounting pattern. You will...
    view full answer...
  • Can 12 Volt Accessory Circuit of 7-Way on Vehicle be Activated
    The black wire/12 volt accessory circuit of trailer wiring isn't always active as not every trailer needs this circuit and since it's always active it can potentially short easier. So on your vehicle you can activate it pretty easily by running 10 gauge wire like part # 10-1-1 which we sell by the foot from the vehicle's positive battery post through a breaker like the # 9510.
    view full answer...
  • Recommended Brake Controller For A 2009 Toyota Sienna
    When it comes to installing a brake controller on your 2009 Toyota Sienna you would first need to make the 4 flat connector into a 7 pin connecter. The Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7 will plug into the existing 4-way trailer connector on the vehicle. There will be three extra wires included: Black - 12 Volt Hot Lead Blue - Electric Brakes White - Ground Using the # ETBC7 will give you both access to a 4 flat and...
    view full answer...
  • Which Wire on a Trailer Brake Magnet is the Power and Which is Ground
    Trailer brake magnets have two wires ran to them. Either can be used as the positive side as long as the other is grounded. To test your magnets you would want to apply 12 volts to one of the wires and ground the other wire. You should hear them grab the drum and start humming. For a replacement breakaway switch you could use the # 2005-P. For an 11 foot 7-way that you could wire your trailer to you would want the part # HM20048. You will need to attach the current wires of your trailer...
    view full answer...
  • Comparing the Bargman 7-Way RV-Style Connector to Hopkins 7-Way Trailer Wire Connector
    The only difference between the Bargman # 50-67-005 and # 54006-059 is the insulation. The # 54006-059 has heavy silicon insulation that is rated for use in temperatures as low as -67 F. As for the connection on the Bargman vs. the Hopkins # HM20048 it is going to provide the same connection, there is no real difference aside from the style. The only difference you will find overall is that the Hopkins has a length of 11' while the two Bargman connectors have a length of 10'. I have...
    view full answer...
  • Can Brake Light Be Wired to Brake Controller Pin on 7-Way Connector
    You can connect any function on a vehicle side or trailer side 7-Way connector, like part # PK11898 or part # HM20048 respectfully, as long as it matches from one to the other. So if you wanted to use the brake controller pin for a separate brake light you can very well do so. What I recommend doing though is to install the 3rd Brake Light Logic Module # PP20-702 on your trailer instead. This separates out the turn and brake signals so you only get the brake signal and it helps you avoid...
    view full answer...
  • Installing 7-Way Trailer Plug on Trailer with Electric Brakes
    I recommend the Hopkins 7-way molded trailer wire connector # H20044. It will measure 6-feet long and provide you the functions required for your electric brakes. If you prefer a longer connector, the same item is available in an 8 foot length as part # H20036 or an 11 foot length as part # HM20048. Please note that the color codes on these molded connectors are different from those usually found on a trailer. The wiring code is on each of the product pages. If you don't have some already,...
    view full answer...
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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 Jacob T
Video Edited:
Jacob T
Employee Laura H
Written by:
Laura H
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Updated by:
Wilson B
Employee Alexander C
Updated by:
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