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7-Way Molded Trailer Wire Connector - 3' Long
Hopkins

7-Way Molded Trailer Wire Connector - 3' Long

Part Number: H20042
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$30.26
Retail:$44.30
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Trailer Wiring
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Great Prices for the best trailer wiring from Hopkins. 7-Way Molded Trailer Wire Connector - 3' Long part number H20042 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (190)
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Hopkins Trailer Wiring - H20042

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Blade
  • Plug and Lead
  • 0 - 5 Feet Long
  • Hopkins


Trailer Connector RV Style 7-Way Blade with 3' lead

  • Pre-wired 7-Way Trailer Connector
  • Measures 3 feet long including connector
  • Wire gauges:
    • 14-Gauge - red, brown, green, and yellow
    • 12-Gauge - blue
    • 10-Gauge - white and black


Wiring Code
Molded Connector Function Usual Trailer Wire
White Wire Ground White Wire
Red Wire Left Turn and Brake Yellow Wire
Brown Wire Right Turn and Brake Green Wire
Green Wire Tail Lights Brown Wire
Blue Wire Brake Power Blue Wire
Black Wire 12 volt (hot lead) Black Wire
Yellow Wire Aux. -



20042 7-Way Molded Trailer Wire Connector, 3' Long

Installation Details H20042 Installation instructions


California residents: click here


Customer Satisfaction Score:


Customer Reviews

7-Way Molded Trailer Wire Connector - 3' Long - H20042

Average Customer Rating:  4.6 out of 5 stars   (190 Customer Reviews)


by:

Perfectfor homemade trailer



by:

just what I ordered



by:

Always great product



by:

excellent, quik ship, follow up



by:

Excellent quality. Needs to be at least a foot longer. Thanks.



by:

This is a good 7-way trailer connector for the price.



by:

Very good quality product and easy to hard wire in.



by:

Connector is well made and eTrailer's service was great. Thanks



by:

I like it. It's better than what's on my rig now.



by:

Seems to be working as needed no problems



by:

Work great for my trailer easy to install



by:

Good quality, quick shipping. Only problem is it should be 4' long. that would place the splice in a more secure part of the frame.



by:

Shipping and product were great. Got it quick. Wish it was bout 6 inches longer.



by:

Second time using e-trailer and I can't believe how easy it is. Parts come super fast and service is A+++. Always happy. Thanks



by:

As described, wires don't match but color conversion chart made things easy and as always quick shipping! A+



by:

Excellent product. Worth the money versus trying to attach your own wires to the plug.



by:

7-Way Molded Trailer Wire ConnUnit looks to be well built and made to last. Haven't installed it yet but with the instructions it will be rather easy. The unit went out fast but it took about a week to get here. That is my only gripe.



by:

This item is fine. Get the next longer length pigtail. I ended up getting the longer length.



by:

Product was new Have not installed yet but looks good Delivery was fast and transaction was good would use etrailer again



by:

Needed for 2010 Nissan Frontier. Looking at the picture it looked like what I needed; it was. The wireing guide on the website was correct. My order was processed the same day.



by:

Works great!This connector was easy to wire in and works perfectly. Mine was a little short of 3 feet so keep this in mind if you need the entire length to fit.



by:

Fast shipping and this is a well made product. I like the sealed plug to the cord so no water enters and causes corrosion. Will buy from E-trailer again.



by:

Friendly helpful staff. I gave the description of my 2 vehicles and what I needed and they found the parts for me. I have done business with E trailer many times and never had a bad experience. I will continue to do business in the future.



by:

Great quality product, however 3FT is probably too short for many applications. I should have measured before I ordered, but 3FT was too short to reach my junction box while leaving enough slack.



by:

I haven't had a chance to install this on my trailer yet but I have to say this was the fastest service I have ever had. I ordered this part Thursday night and I had it in my mail on Saturday!!! If I ever need another part I'll definitely use etrailer.com again.


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See what our Experts say about this Hopkins Trailer Wiring

  • Tekonsha Prodigy Electronic Brake Cable Replacement for Damaged One Dragging on Road
    Easiest solution we can offer for replacing the 7-way and lead of your Prodigy RF part # TK94FR is to hardwire in the part # H20042 in place of the one you lost. Or you could even cut the loom on both side of what you have, strip back the wiring, and then butt end connect all of the connections. For a set of ten butt connectors you'd then want the part # DW05745-10.
    view full answer...
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  • What Gauge Wire Is Required On a 7-Way Connector
    On a 7-Way connector the suggested minimum wire gauge for the White (ground) wire, the Red or Black (power) wire, and the Blue (brake power) wire is 12 gauge. The minimum wire gauge for the remaining Green (right turn/brake) wire, the Yellow (left turn/brake) wire, the Brown (tail lights) wire, and the Purple (reverse light) wire is 16 gauge. I have the Hopkins 7-Way Molded Trailer Wire Connector with Lead, part # H20042. This is a 7-Way blade plug on one end and a 3 foot wire lead. Also,...
    view full answer...
  • Replacement 7-Way Cable for a Tekonsha Prodigy RF Wireless Brake Controller
    Yes, you can but I am sorry we do not have instructions on how to do this. It looks like a pretty easy process to open up the Tekonsha Prodigy RF Wireless Brake Controller and replace the cable. It comes with an 8' long 7-Way and the best replacement option is going to be item # H20046.
    view full answer...
  • Adding 7-Way Connector to Trailer With 4-Way
    Hi Nestor; all you need to do this is a 7-way connector. You can use the # PK12706 or get a 7-way with a plug and lead like # H20042. You will match your current 4-way wires up with the correct wires/pins on the 7-way so the functions carry over correctly. If you get the plug and lead the white is ground, left turn/brake is red, right turn/brake is brown, and tail lights/running lights is green. Your current 4-way likely has the standard colors with yellow for left turn/brake, green for...
    view full answer...
  • Heat Shrink Tube Recommendation for Use with Hopkins 7-Way # H20042
    Yes, the Primary Wire Heat Shrinkable Tubing # DW05402 would work great with the 7-way harness wiring of the # H20042 if you wanted to seal up the wiring after splicing.
    view full answer...
  • Parts Needed to Add Electric Drum Brakes to a Home Made Trail
    The first thing you are going to want to check would be the axle to determine if it has brake mounting flanges welded on. A brake mounting flange on an axle/spindle would looks similar to # TRU74FR or # TRU37FR . The flange is that piece with the holes about midway down each of those examples. If you do not see those on your axle then they will have to be added. This is a precision job that requires a professional welder with the special jig needed and experience with welding on brake...
    view full answer...
  • Can Brakes be Added to an AL-KO Axle that Uses L44643 Inner and Outer Bearings
    There are no brake drums or even disc brakes that will fit a spindle that uses L44643 inner and outer bearings. You would need to replace the axle if you wanted to add brakes. The good news is that you can get axles already set up with brakes. We carry some axles, see link, but if none match up to what you need then you would need to order one to your specifications from a local tractor or trailer supply store. If you go with electric brakes then the trailer will need to be fitted with...
    view full answer...
  • Electric Trailer Brakes Engaging
    Thanks for the nice words and all that information! It certainly isn't normal that your trailer brakes are engaging without a brake controller though there are a couple of reasons why this can happen. My guess is a wiring issue on the trailer where the wires are making contact and 12 volt power is getting through to the brakes. So I recommend going over the wiring from your brakes and tracing it to see if there is an issue there. If need be you can replace with 10 gauge wire # 10-1-1. Or...
    view full answer...
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  • Will the Curt Echo Brake Controller Work With a 5 to 7-Way Adapter
    The Curt Echo Wireless Trailer Brake Controller part # C51180 won't work with an adapter like the Adapter 7 Pole to 5 Pole Flat part # A75TB because the 5th pin on a 5-way is typically for reverse so that's what it would correspond to on the Curt Echo. Therefore, you'd need to replace the 5-way with a 7-way, the Hopkins 7-Pole Round Connector part # H20042.
    view full answer...
  • Need A 5th Wheel Wire Harness Extension Cable.
    I have a solution for you. You can use the TorkLift Wiring Harness Extension for 48" SuperTruss or Cannon Hitch Extender - 7-Way RV # TLW6048. You could also go all out and wire it yourself using the 7-Way Molded Trailer Wire Connector - 3' Long # H20042 and splice it to your current connection cable with the Butt Connector - PVC - for 16-14g Wire # DW05714 and 12-10 Gauge Butt Connector # 05732-2. The wires are gauged as such 14-Gauge - red, brown, green, and yellow. 12-Gauge - blue....
    view full answer...
  • 7-Way Recommendation for a 2012 Nissan NV 2500 to Power an Electric Jack
    What you will need to convert your 4-way to a 7-way so that you can power an electric jack would be the part # 37185. You will also need a length of 10 gauge wire # 10-1-1 (sold by the foot) and then a circuit breaker part # PK54540 to route the power wire from this connector to the positive side of your battery through the breaker. You would not be able to also use the power wire you used to install the 4-way you have on your vehicle. For a trailer side 7-way to install on your trailer...
    view full answer...
  • Wire Gauge for Installing Electric Brakes
    We recommend running 10 gauge wire # 10-2-1 for your brakes to connect to the Junction Box # 38656. You do not need to run the conductors down both sides of the trailer, it really will not make a difference so you can go ahead with your current plan. The 7-Way Molded Trailer Wire Connector # H20042 and Hopkins Engager Push-To-Test Trailer Breakaway Kit # 20400 will also work for you; I also recommend using Ring Terminals # 44-5310A to fasten your wires.
    view full answer...
  • How to Make a 7-Way to 6-Way Square Jayco Trailer Connector Adapter
    Yes, the Jayco trailers use a very unique wiring on their trailers. There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts: 7-Way trailer connector # H20042 6-Pole Square Trailer Wiring Connector Kit, # 37995 Start by identifying the wire functions of the trailer side connector so that it will be easier to wire in the 7-Way later. Connect the 7-Way wires on H20042 to the vehicle...
    view full answer...
  • What Connector is Needed on Truck Camper to Install to Valley Fifth Wheel Wiring Harness # C56000?
    The Curt Fifth Wheel Wiring Harness, part # C56000 will connect inline with the factory 7-Way wiring harness on your 2002 Ford F-250 Super Duty. It will allow you to retain the use of the factory 7-Way on your vehicle now. The camper will need to connect to the vehicle end 7-Way connector of the Curt harness # C56000. The vehicle end connector on the Valley harness would be a male end connector. You will want to use a 7-Way trailer end connector like the Pollak 7-Way Trailer Connector,...
    view full answer...
  • Troubleshooting Trailer Wiring After Installing Lights And Wiring
    There could be a couple of reasons why the lights are not working now. You said you replaced some lights and wiring. I recommend checking all of the connections to make sure everything is secure and wired properly. You can use a circuit tester like part # PTW2993 to make sure all of the lights and wires are receiving current as designed. If everything checks out the problem is probably the ground connections. Check the inside of the trailer connector for corrosion. If you find any green...
    view full answer...
  • Functions of the White, Blue and Black Wires of the Replacement 7-Way H20042
    The white is ground, the blue is for the brake output circuit for the trailer's brakes and the black is for the auxiliary 12 volt circuit for the trailer. If you have no use for these circuits then they would not have to be connected to anything, you would just need to tie them up and out of the way. I attached a chart that shows the functions of each of the circuit of the connector. I attached an install video for you to check out as well.
    view full answer...
    Image 1 for
  • How to Complete Electric Brake Wiring to Trailer Connector
    It sounds like you have a junction box like part # 3375601101 installed on your trailer and the brake output wire from the assemblies are ran to this but not to the trailer connector. If that is the case than all you will need is a ring terminal like part # 44-5310A and some spare wire like part # 10-1-1 to finish running the brake output wire from the junction box to the trailer connector. It sound like you may also need a new trailer connector as well and for that I recommend the 7-Way...
    view full answer...
  • Recommended 7- and 4-way Bumper Plug Extension for Use with Cabover Camper
    I have just the thing for you to extend your bumper plug to the end of your camper. If you want to get the 7-way and 4-way you will want the # H20042 and the # HM48470. This combination will need to be wired up but will include the mounting bracket for the 7-way and 4-way. If you prefer to have a prewired 7-way the one you will want it the # TLW6021. All of our prewired ones will only include the 7-way. A mounting bracket for this extension plug is # TM76474. I have linked all the...
    view full answer...
  • 7-Way Blade Replacement for Tow Vehicle and Trailer
    For a 7-way with a wire lead we have the part # 50-87-004 which you could put on your tow vehicle. Then for a 7-way for you to wire to your trailer we have the part # H20042 that also has a plug and wire lead.
    view full answer...
  • Can 2015 Mitsubishi Mirage With manual Transmission Be Flat-Towed
    Per the owner's manual for your 2015 Mirage, it cannot be flat-towed. You can, however use a tow dolly like the RoadMaster Tow Dolly with Electric Brakes, part # RM-2050-1. Using a tow dolly does eliminate the need for base plates on your mirage and also the need for a tow bar. You will need a brake controller like part # 90885. This is one of our most popular because it is easy to install and operate. Since the tow dolly comes with a 4-way connector you will need to replace it with...
    view full answer...
  • 7-Way Replacement for 6-Way on Trailer to Use with Curt Echo Mobile
    Since there are more 7-way trailers out there than 6-way I'd recommend replacing the trailer 6-way with a 7-way like the # H20042 to use with the Curt Echo # C51180.
    view full answer...
  • How to Make a 7-Way to 6-Way Square Jayco Trailer Connector Adapter
    There is no adapter available that will go from a 7-Way vehicle side connector to a 6-Way square Jayco connector. You will need to make one using the follow parts: 7-Way trailer connector # H20042 6-Pole Square Trailer Wiring Connector Kit, # 37995 Start by identifying the wire functions of the trailer side connector so that it will be easier to wire in the 7-Way later. Connect the 7-Way wires on H20042 to the vehicle side connector in # 37995 based on function. On the H20042: the white...
    view full answer...
  • Adding 7-Way Trailer Connector to Trailer and Brake Controller to 2011 Toyota Tundra
    First, on a 7-Way trailer connector, the center pin is NOT the brake output pin. On a vehicle side 7-Way it is the pin in the 5 o'clock position. On a trailer side 7-Way it is the pin in the 7 o'clock position. It sounds like you are using a 7-Way to 4-Way adapter to go from the truck's 7-Way receptacle to a trailer 4-Way flat. This means the trailer does not have electric brakes, or if it does have electric brakes someone replaced the original connector with a 4-Way flat. If your trailer...
    view full answer...
  • How To Make Adapter To Go From 7-way Connector To European Connector
    Starting with the adapter to convert your 7-way blade connector to the European connector you will need to make this adapter your self starting with a trailer end 7-way connector like the # H20042. You will also need a 2-wire to 3-wire converter # C56196 to convert the combined brake light and turn signal wiring of the 7-way blade connectors to separate wires which the European connectors use. Unfortunately, we do not offer the European connectors, so you will need to source one to complete...
    view full answer...


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