bing tracking image
  1. Trailer Wiring
  2. Hopkins
  3. Trailer Connectors
  4. Trailer End Connector
  5. 7 Round - Blade
  6. Plug and Lead
Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long

Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long

Item # HM20087
Our Price: $63.84
Trailer Wiring
Shipping Weight: 2 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

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
The LED test lights on this molded, 7-way, RV-style, trailer-end connector confirm connectivity between your trailer and vehicle for simple troubleshooting. Durable cable covering resists damage. Great Prices for the best trailer wiring from Hopkins. Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long part number HM20087 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (109)
  • Q & A (0)
  • Photos

Hopkins Trailer Wiring - HM20087

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Blade
  • Plug and Lead
  • 6 - 10 Feet Long
  • Hopkins

The LED test lights on this molded, 7-way, RV-style, trailer-end connector confirm connectivity between your trailer and vehicle for simple troubleshooting. Durable cable covering resists damage.


  • Pre-wired, 7-way, blade-style, trailer-end connector allows you to connect your trailer to your vehicle
  • Built-in LED lights provide easy troubleshooting
    • Illuminate to verify that the connector is receiving power from your tow vehicle
    • Labeled for each function on your trailer
  • Easy-to-grip tabs allow for simple plug in and disconnect
  • Flexible cable allows for easier positioning when connected
  • Molded cable sleeving protects wires
    • Durable covering is insulated and corrosion-resistant
  • Simple installation
    • Hardwire to existing trailer wiring


  • Cable length: 8'
  • Wiring configuration:
    • White: ground wire
    • Red: left turn/brake light
    • Brown: right turn/brake light
    • Green: tail lights
    • Yellow: reverse lights
    • Blue: electric brakes
    • Black: auxiliary power
  • 90-Day limited warranty

20087 Hopkins 7-Way, RV-style Connector Cable with LED Tester - 8 Feet

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long - HM20087

Average Customer Rating:  4.8 out of 5 stars   (109 Customer Reviews)

The LED test lights on this molded, 7-way, RV-style, trailer-end connector confirm connectivity between your trailer and vehicle for simple troubleshooting. Durable cable covering resists damage.


The junction box provides adequate room for wiring terminations and weatherproof covering of them. The harness for transmitting power to the trailer is of robust design with LED lights indicating proper power to the various end uses. A stainless steel u-bolt was used to secure the harness to the trailer frame and thereby eliminate stress on the junction box. Stainless steel machine screws were used to attach the Breakaway Battery Box to the trailer frame. A stainless steel quick connect will be used to secure the Breakaway switch to the vehicle. The red lead supplies 12 volt power to the Breakaway battery.


Up graded my stock p.o.s. Whip with this one.
I like how I don’t have to have someone check my lights, as it shows when it’s good or not getting a connection.



Still working great


Wanted a water tight connection for my travel trailer.
Had issues with water corrosion.
Also being 8 foot allows me to locate connections to the trailer in a better place to be accessible.


This is an excellent quality cable, it stays pliable in cold weather and the plug is snug and so stays connected. Prior to installation I used an ohm meter on each conductor to check each one and to verify what conductor what to which connector. Once verified it was an easy installation.


Shipped cheapest ground UPS because I was not in a hurry. Arrived quickly. I took steps to compare the pigtails and all wires COLORS matched exactly my 5th WP. My old one was all brass connectors and had corroded enough to lose connection while driving down roads. It may have been simply the center of the female receptacle center that needed to be pushed slightly together to create a better pinch grip on the center pin from the cable male end. Regardless, this was a quick replacement color wire for color wire. IF NOT; I WOULD HAVE MADE A HAND-DRAWN DIAGRAM TO FOLLOW. I LOVE THE LED LIGHTS Keep reading for steps I used to replace. First took clear phone pictures of the existing wire connections. Next step to remove existing has options. You could simply carefully select each existing pigtail cable wire and cut it leaving behind all existing trailer wires with a piece of each wire intact left behind as you remove the existing pigtail cable. If you don't cut the old pigtail wires this project could get confusing. My wires were all connected using wire nuts in a small 4" square electrical box. STOP - the first step is to disconnect the battery and all power so you don't spend hours trying to find a fuse you blew. Okay back to the electrical box with the existing wires with the wire nuts still intact. I put the new cable into the 4" electrical box and one-by-one connected the new cable. Some of the existing wire nuts had up to 4 other existing wires in each. Since all my colors matched, I did not take a picture. I just cut existing out and new in; about 10 minutes but 30 minutes total with wife helping test all lights, brakes, turn signals, etc. I LOVE THE LED LIGHTS that helped me figure out that my ground was losing connection if I pushed the plug a little to the sideways. I pinched the center blades together in my receptacle and now know it is possible my existing cable was not bad. (I had forgot to unhook and drove off a couple times and I though that might have stressed internal pigtail wiring causing intermittent "trailer disconnected" warning on my truck dash lights. By the way, this new cable does not show any brass connectors. Yes, I would buy again and would recommend to my friends and might hide from my enemies. I did find a lower price elsewhere but this one with LED was best option for my needs to know that this product is sending electric power to my trailer brakes, lights, and battery on my 5th Wheel camper. Full timer over 2 years so far.

Rick A.


I have used this for about a year now AND the LED lights on the connector have been great to have. Twice, so far, my truck has said I did not have trailer brakes connection. The lights verified. The connection wiring in the truck have been replaced and the LED feature helped me with a truck warranty claim.


Using to replace factory pigtail which is short, causing loss of connection in turns. Would be better if wiring instructions were included.


I don't know if you are interested
or not but the trailer pigtail connector configuration is somewhat confusing regarding single-blade vs double-blade contacts on the different brands of pigtails and what tow vehicle 7-way receptacle brand that they fit. I assumed that they were all compatible but that is not the case. I've had many issues with "Trailer Disconnected" errors using the double-blade configuration pigtail that came on my travel trailer. The Hopkins 20087 pigtail seats so much better and seems to have resolved the errors issue.


Great 7 pin harness,high quality and LEDs help in solving problems.


High quality product used to replace a lower quality harness installed by the RV manufacturer. I was having intermittent “check trailer brakes” on my dashboard display. Suspected a wiring issue. Founded crashed insulation on the blue trailer brake wires in the travel trailer junction box for all functions. Repair complete and no repeated error messages. The LED system status lights provide instant information that the truck is providing al proper electrical signals and power for the travel trailer.





exactly what I ordered and very fast sh ipping


Product arrived in good condition. I'm certain it's going to work perfectly.
The plug is a heavy rubber compound with the LEDS molded into the handle. Great looking and feeling over all. I got the 8' wire to replace the travel trailer cord that got pinched.
I chose this style because I didn't have a volt meter with me and ended up spending an extra 2 hours to figure out the repair I made was good and that I had blown the fuses. The LEDs will save me if it happens again



Been working great Still has all the indicator lights on the plug itself. We only use our trailer 6 to 8 times a year so, not really sure that my usage would really count as being used but, yeah it still works as expected.


The molded end helps keep water out and the LEDs let you know you have voltage to the plug if a light doesn't work.


Great product. Heavy duty cable. Liking that I can keep a eye on 7pin is getting power to it by just looking at the test lights.


This items has not yet arrived to us.


Great harness. Only drawback was that a single indicator light does not work. It does not impact the circuit, but the LED on the plug does not show when circuit is active.


Absolutely love this harness! I kept getting the trailer disconnected message from my TT. This solved it and the LEDs show you what power is beeing sent from the truck. I gave 4 stars because there should be a diode because the AX light stays on even when it is unhooked from the truck and will not show if the truck is charging the TT because of the TT battery.


I ordered the product thinking I would have a number of days to complete other projects. The product arrived so quickly that I was not ready to install it. I had searched for this product and very few places (RV supplies sell it). I was glad when I found it on etrailer.

The product is as advertised and was very easy to install. The LED's are a quick method of determining the condition of your wiring and signals both from your tow vehicle and from your travel trailer. I would highly recommend it when you need to replace your cable. It is very reasonably priced.


90 day warranty and I didn’t use it in those 90 days. Truck keep getting error of trailer disconnect. Traced it to no connectivity on one wire. I cut the plug off and put a new one and never looked back.


I love this harness! It is built extremely well and it has every wire that you will ever need. it also has confirmation LED lights on the connector! This makes it extremely easy to to trouble shoot any malfunctions. I put it on all my trailers.


Heavy duty!


Another home run for etrailer! After replacing trailer wiring several times over the years, I finally found a replacement that will last
The harness is very well constructed ( better than expected)! The cable is well protected and durable. The 8 foot length is perfect for most any application to get wires right back to trailer. No more blinking lights!


Quality product. I would use E trailer for all my future trailer needs.


The cord I received is only 4 foot long. Second product sent that was wrong, the part that makes me upset is that I had to pay the cost to have the first one sent and send it back. The RV is in my driveway and I opened the box tonight to get ready to install it in the morning and it wrong.

Etrailer Expert

Jenny N.


I will have our customer service team reach out to you.


While more expensive than some other trailer whips, this one fits the truck better than most. The LED lights are somewhat useful, but not necessary.


The trailer cord worked out very well. All the color coated wires matched nicely with the wiring on the camper. Well worth the cost of the replacement cord.

Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Installation of 7-Way Trailer Wiring When Colors Dont Match
    If you have connected your Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long # HM20087 incorrectly, you will not cause any damage to your system as long as the ground connection installed correctly. If the ground is in the wrong location you have the potential to blow fuses, damage lights, etc. If the ground is in the correct location, then the wiring will work and you just will need to match functions. If you are unsure of the ground connection,...
    view full answer...
  • Can LED Test Lights on Hopkins 7-Way RV Style Connector HM20087 Cause Battery Drain
    LED lights, including LED test lights that can be built into trailer wiring, use so very little power that you do not need to be concerned about depleting your battery. It would take many, many months of continuous draw (without ever running the truck to charge the battery) for such an item as the Hopkins 7-Way RV Style Connector # HM20087 to cause any issue with battery drain in your 2012 Ford F-150.
    view full answer...
  • Does Hopkins 7-Way RV Style Connector # HM20087 Meet SAE J2863 Specs
    Yes, the Hopkins 7-Way RV Style Connector # HM20087 that you referenced does meet SAE J2863 specifications.
    view full answer...
  • Why Does The Test Light For Brakes On Tekonsha 7-Way Blink When Brake Is Not Pressed?
    The blinking light on the Hopkins 7-Way # HM20087 is caused by the factory controller on your GMC Sierra 3500HD verifying the circuit connection with your trailer. It does this by sending small amounts of power through the brake circuit to determine if the circuit is completed and verifying a trailer with electric brakes is connected.
    view full answer...
  • What Gauge are the Wires Associated with the Hopkins # HM20087
    The Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long # HM20087 has 2-10 gauge wires (12V and Ground), 1-12 gauge wire (Electric Brake), and 4-14 gauge wires. I've attached a video that will walk you through each function and color code/LED label.
    view full answer...
  • Diameter of Cord on Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights
    The diameter of the cord on the Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights part # HM20087 is 9/16" according to Hopkins.
    view full answer...
  • Replacing 6-Pin Trailer Connector For 7-Way Blade Connector
    If you are not wanting to use a Adapter 7-Pole to 6-Pole # 47549 and would rather wire in a new Hopkins 7-Way RV Style Connector # HM20087 the wiring may be confusing. There may be some trial and error involved as the wiring could have been connected differently on your trailer. I have included a picture below of the plug wiring if you have not already removed the 6-pin connection so that you will be able to label the wires based off their location in the connector. I recommend tracing...
    view full answer...
    Image 1 for
  • Does Trailer Wiring Kit for 2017 Volkswagen Tiguan Need to Run to Vehicle Battery
    Not all vehicles can handle the additional amperage draw of the trailer taillights on the vehicle taillight circuits. Those vehicles need setup that draws power from the battery which is what the # 118675 does. Some vehicles have higher rated circuits that can handle this, and others need to have the power drawn straight from the battery to protect the taillight circuits. I know it's super tempting to power the converter from an easy to access power source but doing so voids the warranty...
    view full answer...
  • Replacement 7-Way Trailer Cord That Works in Cold Weather
    If your concern is cold weather then I recommend the Bargman 7-Way Molded Trailer End # 54006-009 which is insulated by the heavy duty blue silicon and is rated for down to -67 degrees Fahrenheit. Attached is an installation video as well as the wiring code for this connector.
    view full answer...
    Image 1 for
  • 7-Way Connector and Wiring Configuration When Connecting To Junction Box On Trailer
    It really comes down to the 7-way and wiring you are using. You saw the Hopkins 7-Way RV Style Connector # HM20087 which uses the following wiring configuration. White: ground wire Red: left turn/brake light Brown: right turn/brake light Green: tail lights Yellow: reverse lights Blue: electric brakes Black: auxiliary power We also have the Hopkins 7-Way Auto Blade Style Connector # HM20041 that uses the more common color configuration. White: ground wire Yellow: left turn/brake light Green:...
    view full answer...
  • Replacing Blue Wire Missing From 7-Way Wiring Connection
    If the 7-way you are referring to is the trailer side connector you will only need the blue wire in the 7-way if your trailer has electric trailer brakes. I do know that there are several trailers on the road with 7-way connectors for the charge line that do not have electric trailer brakes. Very common is small teardrop trailers and popups. If your trailer does have electric brakes then it is best to replace the 7-Way Cord # HM20087 to the Junction Box # 38656. If you are referring...
    view full answer...
    Image 1 for Image 2 for
  • Is There A 7-Way RV Style Connector With Pig Tails That Is 6' In Length
    I do have something that will work for you. The Mighty Cord 7-Way RV-Style Trailer Connector w/ Molded Cable - Trailer End - 6' Long, part # A10-7W6, is the same style 7-way cord as the Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long, part # HM20087, you attached to your question. The main difference, besides length, is the Mighty Cord does not have any LED test lights. Unfortunately, we do not have a Hopkins option that is shorter than 8'....
    view full answer...
  • Recommend Trailer Wiring Connectors To Test Functions Of 7-Way
    It sounds like you are looking for the LED testers integrated into your wiring. If you want the trailer side 7-way with LED, I recommend the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End # HM48503. This will let you know if power is being received from the tow vehicle for each function to make testing and troubleshooting easy. This is already integrated in the Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long # HM20087....
    view full answer...
  • Charger Recommendation for Charging Battery of Dump Trailer
    For a charger for your trailer's battery the best option we have is the Redarc In-Vehicle BCDC Battery Charger # 331-BCDC1240D which is designed for putting up to a 40 amp charge on a battery that is rated higher than 200 amp-hours. The fuse kit you'll need then is the # 331-FK60. I know it's not exactly inexpensive but charging a larger battery while towing requires a special charger setup. For a 7-way with junction box to make wiring up the lighting and braking of your trailer the #...
    view full answer...
    Image 1 for
  • Parts Needed To Rewire and Add New Lights to a 7 X 16 Utility Trailer With Electric Trailer Brakes
    Here is a list of the parts you will need to rewire your 7' X 16' utility trailer. I have added the breakaway kit as it will be required by law as your trailer does have brakes. Hopkins 7-Way RV Style Connector # HM20087 etrailer Trailer Wiring Junction Box # 3430001-JBK Optronics Trailer Light Kit # TL16RK Bright Way Push-to-Test Trailer Breakaway Kit # 3802346 Jacketed 2 Wire (Brake Wire) # 12-2-1 (sold [per foot)
    view full answer...
  • Adding a New 7-Way Trailer Connector and Wiring to a Car Hauler Trailer
    You will likely need some additional wire to reach the lights when installing 7-Way connector # HM20087. If you just want 4-wire you can use # DW04923-1, sold by the foot, or # 16-4B-1, also sold by the foot. You will also need some butt connectors such as heat shrink version # DW05744-5. If you want all 7-wires you can use # DW04914-1 which is sold by the foot as well. Another option is a 7-Way that is considerably longer, # 50-67-103, which at 15 feet long which is longer than the length...
    view full answer...
  • Parts to Convert From 12 Inch Hydraulic to Electric Trailer Brakes
    Thanks so much for the photos as they were very helpful; they show your trailer's drums are 12 inches in diameter, and that you do have a 5-bolt brake mounting flange. To switch from hydraulic to electric trailer brakes you are correct you would be able to use your current coupler as well as drums, and we do have the parts needed for you to switch, which are the following: - Electric Trailer Brake Kit - Self-Adjusting - 12" - Left and Right Hand Assemblies - 5.2K to 7K # AKEBRK-7-SA -...
    view full answer...
    Image 1 for Image 2 for
  • Parts Needed For Installing Electric Trailer Brakes On a Utility Trailer With Dexter 3,500LB Axle
    First you will need to verify that your Dexter axle has a Brake Flange # 4-35 to attach the Electric Trailer Brake Kit # AKEBRK-35-SA. The brake kit includes both the left and right side brake assemblies which are self-adjusting for better performance and to save you on having to adjust the brakes every 3,000 miles. Next you will need 2 Easy Grease Trailer Hub and Drum Assemblies # AKHD-545-35-EZ-K to replace your idler hubs. These have your same 5 on 4-1/2" bolt pattern along with the...
    view full answer...
  • Parts Needed For Adding 7-1/4 Brakes To Trailer With 2,000LB Axle
    The Easy Grease Trailer Hub and Drum Assembly for 2K Axles # AKHD-545-2-EZ-1K includes the 1" inner diameter Bearings # L44643. The Assembly # AKHD-545-2-EZ-2K includes the 1-1/16" inner diameter Bearings # L44649. To determine which ones will fit your axle you will need to remove the grease cap and spindle nut to find the number on the outer bearing. If there is not one of the bearing numbers stamped on your bearing you will need to measure the spindle using a Digital Caliper # PTW80157....
    view full answer...

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B
Employee Hayden R
Installed by:
Hayden R
Employee Alexander C
Written by:
Alexander C

At 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.