Adapter 7 Pole to 4 Pole and 5 Pole

Hopkins Wiring - 37385

Wiring Adapter - converts the 7 way trailer connector on the vehicle to a 4 way or 5 way connector to match the trailer.

If your truck has the connector on the left, and your trailer has one of the connectors on the right, you will want this adapter.
Vehicle End	Trailer Ends

Hoppy # 47385, TAP # 37385

Customers compare 37385 to these similar products

Hopkins Endurance Multi-Tow Trailer Connector Adapter - 7-Way to 6-Way, 5-Way or 4-Way$21.95

Pollak 7 Pole to 4 Pole Connector Adapter$8.99

Adapter 7 Pole to 4 Pole with Tester and Cover$14.95

Adapter 4 Pole to 7 Pole Vehicle End Trailer Connector$17.45

Hopkins Multi-Tow Trailer Connector Adapter - 7-Way to 5-Wire Flat/4-Wire Flat and 12-V Power Socket$17.95

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Customer Reviews

Adapter 7 Pole to 4 Pole and 5 Pole - 37385

Average Customer Rating:  4.8 out of 5 stars   (16 Customer Reviews)

- 37385

by: Mario R05/17/2011

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Great service and website.. received qu ickly.14479

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by: zane12/05/2011

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Very cool parts, quick service and deli very!27692

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- 37385

by: Steven Kimball10/15/2011

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This is my second same kind Brake controller. I hope to take advantage of the trailer connection for that 5th surge brake connection, yet have the 4 pin available for a lot of other stuff. Have yet to install but all looks good.25605

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- 37385

by: Albert05/11/2011

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High quality product, works great on my 2008 GMC Sierra.13578

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- 37385

by: Rick B.05/04/2011

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Notification of receipt of order and of shipping was great. They could not have done a better job. 12860

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- 37385

by: Stephen03/15/2011

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Ordered this because I needed the 5 flat. Fits in perfectly to my Pollak 7-way. I'll let you know how the installation goes.9404

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- 37385

by: Larry s.01/24/2013

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The adapter works great on both of my boat trailers, one that has a 5 pole plug and the other has a that is 4 pole plug.64074

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- 37385

by: Rich A.05/29/2012

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Great accessory at a great price. 41931

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- 37385

by: Scott05/17/2012

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Beyond the exceptional service I received when ordering the P3 Tekonsha brake controller, I found the quality of the product to be terrific great and the instructions thorough. As well, the follow-up I received from the time of placing my order to delivery was exceptional. I always knew where the order was while in transit and had great follow-up along the way. I will be sure to return for any other trailering needs I may have. I look forward to pulling my vintage and historic race boat to boating shows and events all over the USA.40803

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- 37385

by: Adaptor 7 to 5/4 pole05/14/2012

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Fantastic. Elliminates need for 2 separate harnesses. Many trucks already have a 7 pole connector and a 4 pole connector but nobody has a 5 pole connector so this kills 3 birds with one plug.40443

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- 37385

by: Kevin L05/10/2012

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This adapter takes the place of two! I have two trailers with different plug connectors, this product works for both eliminating the need for different plugs.39992

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by: Joe N.05/02/2012

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Quality products offered at reasonable prices. Prompt shipping39124

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- 37385

by: Joe N.05/02/2012

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Quality products 39123

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- 37385

by: Hayes03/30/2012

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I find this adaptor to be very useful as I own and frequently tow, different size trailers all with different plug connectors. Nothing is worse than not having the right connection to make your trailer connection. 35595

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- 37385

by: FourEyesNoThumbs05/14/2011

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The adapter fit tightly and worked well. Be careful attaching and detaching the trailer harness so, you don't bend the bottom metal, male connector. Everything installed correctly the first time and worked on my 2011 Honda Pilot. What a relief. It took me about 2.5 hrs because, I had to figure out fasteners for the bumper, existing wiring harness, etc. so I didn't break anything. Make sure you have a center punch, sharp metal drill bits and oil to pilot holes for self tapping screws. I am very happy with the harness and adapter.13947

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- 37385

by: Pilz01/23/2012

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This is a great feature if you have a 4 and 5 pin plug for different trailer hookups.30212

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Ask the Experts about this Hopkins Wiring

• What is the 5th Pole Used for in 7-Way to 5/4-Way Adpater 37385
  
• The fifth pole on 7-Way to 5/4-Way adapter is not wired for electric brakes. It is wired for reverse lights.
  view full answer...


• Will The 7 Pole to 4 Pole Adapter Fit My 2007 Toyota Tacoma
  
• The adapter that you have selected, Adapter 7 pole to 4 Pole and 5 Pole, part # 37385 will work perfectly for your 2007 Toyota Tacoma with 7 way plug. It will convert your 7-way to a 4-way or 5-way with your flat trailer connector.
  view full answer...


• Troubleshooting Trailer Brake Lights not Working When Running Lights are On
  
• It sounds like you might have a bad ground connection. When the taillights are on, that is when there is the most power draw on the system. Stepping on the brakes would then add more and this is when a ground problem will usually show up. The taillights usually ground through the mounting bolts on trailers. Check for a bad ground, loose connection, and dirt and corrosion. Any of those can cause this problem. Also check the light bracket connections to the trailer frame as lights can ground t
  view full answer...


• Will Adapter 7 Pole to 4 Pole and 5 Pole Work On My 2010 Toyota Tundra With Tow Package
  
• If your 2010 Toyota Tundra is equipped with tow package and factory 7-way on the back of your truck then yes the Adapter 7 Pole to 4 Pole and 5 Pole, part # 37385 will match up perfectly. The 5 pin flat connector on your trailer will plug directly into the 5 pin outlet on part # 37385.
  view full answer...


• Troubleshooting Trailer Brake Lights Do Not Work When Brakes Applied on 2001 GMC Yukon
  
• The first thing I would do is to use a circuit tester, like the Quickee # 3808, to test the vehicle side trailer connector with no trailer connected. If your 2001 GMC Yukon has a factory installed 7-Way, test the pins in the 3 oclock and 9 oclock position. Have someone step on the brakes while testing the pins. The test light should show a signal. If it does not, then something is wrong with the wiring on the vehicle and you will need to trace the wires back to look for any broken or loose conne
  view full answer...


• Installing a 7-Way Trailer Connector and Brake Controller on a 2006 Ford Expedition
  
• On your 2006 Ford Expedition, there should already be a factory installed trailer connector. It will either be a 4-Way flat or a 7-Way blade. If your vehicle has a 4-Way flat, you will need to add Adapter 4 Pole to 7 Pole and 4 Pole, # 37185. On this connector, you would plug your 4-Way into the corresponding plug on the adapter. The remaining wires would need to be hardwired. Take a look under your vehicle behind the driver side rear tire and the bumper for the trailer wiring. There will be mor
  view full answer...


• 7 Pole to 4 Pole and 5 Pole Adapter # 37385 for a 2011 Chevy Silverado Northstar Camper or Boat
  
• This Adapter 7 Pole to 4 Pole and 5 Pole, part # 37385, is designed to plug into a 7 way trailer connector and convert it to either a 4 way or 5 way connector. As long as your Northstar Pickup camper and boat trailer have either a 4 or 5 way flat connector this should work perfectly for you.
  view full answer...


• Can The 4-Way and 5-Way Connector of The Hopkins Adapter # 37385 Be Used Simultaneously
  
• I contacted our representative at Hopkins and he informed me that you can use both the 4-way and 5-way plugs of the Hopkins Adapter # 37385, at the same time without a problem. In your setup you would not need the extra pole on the 5-way as it is for brake function on a trailer with surge brakes. You will want to be cautious not to add so many lights that you overload the vehicle wiring.
  view full answer...


• Converting a 4-Way Flat to a 5-Way Flat Trailer Connector on a 2006 Toyota Sequoia
  
• There are a couple of ways you could add a 5-Way flat to your 2006 Toyota Sequoia. I recommend a more direct method. You can use the Adapter 4 Pole to 5 Pole Trailer Wiring Adapter, # 20036. One end plugs into the 5-Way on the boat trailer, the other end plugs into the 4-Way on the vehicle. The 4-Way end has an additional wire for the extra function that is on the 5-Way end. If the extra pin on the trailer is used for an electric reverse lockout, you would connect the blue wire to the reverse
  view full answer...


• Adapting a 5-Way Flat Vehicle Side Trailer Connector to a 4-Way Flat for Towing Lights
  
• You may be able to plug in the 4-Way flat into the 5-Way flat without an adapter. There will just be one pin that is not used by the 4-Way left over. All the other functions will still work. The pin furthest from the ground pin (on the vehicle side 5-Way) will be the one that is not used. If the two connectors will not fit together, you can use Wiring Kit, # HM47890. You will just need the trailer side of the kit. You will have to replace the connector on the tow lights with the trailer side
  view full answer...


• Only Left Side Brake and Turn Signals Working on Boat Trailer
  
• This sounds like a ground problem. A loose, broken, or corroded ground connection can cause all sorts of unwanted problems for electrical components including trailer taillights. I would start with checking for a proper ground at the taillight itself. Trailer tail lights can be grounded in one of two ways. The first way is the tail light assemblies can be grounded by a separate wire coming out of the back of the tail light and attached to the trailers frame. The second way is the tail lamp a
  view full answer...


• Recommendation for a 7-Way to 4-Way Flat For a 2011 Honda Pilot and Boat Trailer
  
• Yes, the Adapter 7 Pole to 4 Pole and 5 Pole, # 37385, will work with your 2011 Honda Pilot. We actually have several adapters that will work for you. I have included a link to them for you to view. If you do not have both a 4-Way and 5-Way trailer, which the 37385 adpater will accommodate, I would go with something a little more simple like the Pollack Adapter, # PK12716.
  view full answer...


• Trailer Brake Lights Not Working on a Trailer Towed by 2008 Isuzu N-Series
  
• The turn signals and brake lights should be on the same circuit. What I think may be happening is when the brake lights are on, they draw more power. When more power is drawn, this is usually when you will see ground wiring problems. First, I would make sure that the vehicle side connector shows the same pin for turn signal and brake lights using a circuit tester like # 3808. Next, check to make sure both the trailer side and vehicle side connectors are free of dirt and corrosion. Then mo
  view full answer...


• With Trailer Running Lights On, All Lights Go Off when Applying Vehicle Brakes
  
• The problem with the lights going off sounds like a ground issue. The brake lights apply additional load on the wiring and this is usually when a ground problem will show up. First, make sure that the trailer connectors are clean and free of any corrosion. Corrosion can cause a short which can lead to many problems, including the flashing problem. On the trailer side, make sure the main ground wire from the trailer connector is attach to a clean and corrosion free bare metal surface. The trai
  view full answer...


• Troubleshooting Trailer Right Turn and Brake Lights Not Working
  
• The brake and turn signals are on the same circuit so it is strange that it is malfunctioning in this manner. My first thought is that the load of having the light attached is causing the issue. This could be a couple of things. First, depending on the vehicle, you may need some additional relays to make the trailer wiring fully functional. It will show it works when testing it with a meter because it is not enough of a load. When you add and actual light, it puts more load on the system so t
  view full answer...


• Trailer Lights Do Not Work when Connected to 2011 Chevy Silverado but Do Work with Other Vehicles
  
• If your 2011 Chevy Silverado came with a factory tow package (or even if it did not), there may be some connections that you will need to make under the hood to make everything fully functional. You can take a look at the FAQ article I have linked at the Finalizing Connections for the Brake Controller section. It is also possible that you may be missing relays and/or fuses associated with the tow package wiring. You can use the owners manual to make sure that you have checked all of them.
  view full answer...


• Troubleshooting Trailer Lights on an Older Trailer and a 2004 Chevy Tahoe
  
• There are two possibilities for the problem you are experiencing. Either the wiring on your 2004 Chevy Tahoe is incorrect, or the wiring of your trailer is bad. The first thing I would do is test the 7-way on your Tahoe by function to determine if it is the problem. To do that you will need a buddy to apply the different brake and tail light functions of your vehicle while you test for the correct voltage with a Circuit Tester like # 40376 on the 7-way. I attached a video on how to do this wi
  view full answer...


• Hydraulic Trailer Brakes Locked Up When Backing Boat Trailer
  
• A bad ground can cause all kinds of problems and that is going to be the best place to start checking. You will also want to check the vehicle and trailer side connectors for corrosion. Since everything was working fine, though, chances are that it is the ground that is causing your problem. It sounds as if the electric reverse lockout was not working which could be a result of the bad ground. But you will also want to check to make sure that the wire to the solenoid and the solenoid itself
  view full answer...


• Can 4 and 5-Way be Used at Same Time for Boat Trailer and LED Light Strip on Adapter # 37385
  
• The LED light strip is not going to be using all that much power. However, what I recommend is to determine how much power draw the wiring system on the truck is rated for and compare that to the combined power draw of the trailer lights and light strip to be on the safe side. Normally, you would not use the 4-Way and 5-Way at the same time. But, if the LED light strip has a low enough power draw it should not be a problem. You will also need to make sure that the 7-Way on the truck is co
  view full answer...


• Trailer Brake and Turn Signals are Not Working but Running Lights Work
  
• If you are using an adapter like # 37385, it could be that the adapter is not pinned out the same way as your trailer requires. What you can do is test the functions on the trailer connector on your vehicle with a circuit tester like # 3808 if needed to make sure that all of them are working properly. If they are then you know the problem is behind the vehicle side connector. If they are not working properly on the tow vehicle it could still be a blown fuse or relays that needs to be replaced
  view full answer...