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Wiring > Wiring Adapters > Single-Function Adapter > 4 Flat > 6 Round > Plug and Lead > Tow Ready


Adapter 4 Pole to 6 Pole

Tow Ready Wiring

ratingratingratingratingrating (25 reviews)


Code:   30637

Retail:$27.20

Price:$20.95


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Shipping Weight: 0.8 pounds

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Tow Ready Wiring - 30637

Adapter converts your 4 pole wiring on vehicle to 6 pole round connector. Additional leads for brake (blue) and power (black) can be connected to allow for electric brakes and accessories.

Recommended
Wiring Harness Mount Brackets


Tow Ready # 20320





Video of Adapter 4 Pole to 6 Pole


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

Video Demo Tow Ready Wiring 30637
Tow Ready Wiring 30637 Review

Video Transcript for Tow Ready Wiring 30637 Review




Customer Reviews

Adapter 4 Pole to 6 Pole - 30637

Average Customer Rating:  ratingratingratingratingrating4.8 out of 5 stars   (25 Customer Reviews)



- 30637

ratingratingratingratingrating by: Brad S08/27/2014


I purchased this along with factory wiring connector for my Chevy K10- that was a breeze to click into the factory harness. I was having issues with the wiring job from before, i cam across Etrailer and found these quick install harness to fit my needs. it took less than 15 minutes to click in to space. i mentioned before, Cheaper than the local Trailer shop and no splicing. Good quality, on time delivery, easy to install. 148960






- 30637

ratingratingratingratingrating by: Morgan M.06/02/2012


Work perfect. This Adapter worked perfectly for what I needed. Seems to be heavy duty and durable. I'm using it for a Stock trailer to pull a horse. It was really helpful the way this site is set up. By having the customer tell them what type of plug from the Truck and Trailer, it advised me the exact plug I needed. No other auto supplier, Wal Mart or anyone I asked could get me the right plug. 42462






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ratingratingratingratingrating by: Jeremiah03/18/2013


I used this with a Ford Ranger adapter. It hooked right up. I didn't see that it didn't have the bracket to attach to my pickup. I bought one at an auto parts store. It was easy to attach and works. The price was the cheepest I found, shipping was great. Etrailer is great to work with. I will shop here again. 71284






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ratingratingratingratingrating by: Timothy Clifford07/19/2012


Only place I could find this hook up! Drove about $15 worth of gas going to the usual auto parts stores. No one had it. Came to etrailer, bang! Instant find (with help from a fella that put me right on the product number). Fast deal, fast shipping, exactly what I needed! 48495






- 30637

ratingratingratingratingrating by: Ernest L.06/20/2014


I was told to check out etrailer for all my needs anything for my trailer and like WOW!!!! They actually had what I needed and shipping was fast. It works perfect with NO issues at all. Thanks guys for your help on this and I will definitely order again from you. 136748






- 30637

ratingratingratingratingrating by: bishop3d06/19/2012


Product worked as advertised. Did not utilize the brake wiring (didn't need to for my application). If I choose to keep permanently hooked on my 04 Pilot, will require some mounting hardware since tralier hitch doesn't really have anywhere to put it. 44788






- 30637

ratingratingratingratingrating by: Bill LaCombe05/06/2014


I had to give you this praise too! Great website! My son and I have both ordered recently! Fast, cheap shipping! Products worked AWESOME!!! Thanks! The wiring harness for his Dakota was awesome. The adaptor was even easier! 129231






- 30637

ratingratingratingratingrating by: Danny B03/02/2012


Product is well made and came exactly as described. I placed the order on Sunday night, went with standard delivery, and it was delivered on Wednesday. Great turnaround and wonderful experience 33035






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ratingratingratingratingrating by: Paul M,05/15/2013


Product serve it's intended purpose exactly as planned. Very pleased with the product and especially Etrailers service. Excellent communication. 80428






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ratingratingratingratingrating by: Shane04/03/2013


Got this to go on my jeep. Installed clean and discreet. Definitely low profile and guarenteed to stay out of harms way while wheeling in our JK! 73949






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ratingratingratingratingrating by: Mike C11/06/2011


Now I'm ready for what ever harness I come across. Plenty of room in the jack compartment for it to stay new and ready when I need it. 26638






- 30637

ratingratingratingratingrating by: David G02/21/2013


I SHOULD HAVE ORDERED A BRACKET TO HOLD IT BUT THE PRODUCT IS WHAT I WANTED AND LOOKS GOOD. I AM MAKING A BRACKET TO HOLD IT 67268






- 30637

ratingratingratingratingrating by: Todd07/22/2011


Exactly what I was looking for but had a hard time finding it anywhere else for such a reasonable price. 19865






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ratingratingratingratingrating by: Dan R.09/14/2011


The only thing that would make this better is if the hitch had a convient place to install it. 23946






- 30637

ratingratingratingratingrating by: Gus05/14/2013


Thank you for your prompt delivery. It was exactly what we needed. 80307






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ratingratingratingratingrating by: Barney10/04/2014


Works great. Delivery was quick and product was just the ticket. 154472






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ratingratingratingratingrating by: Richard J07/17/2012


Product arrived in a timely fashion and installation was simple. 48250






- 30637

ratingratingratingratingrating by: Thomas Tran11/20/2013


Great product to connect to 4 pole flat from Honda Pilot 107886






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ratingratingratingratingrating by: Scott G07/24/2013


Easy to install. Works as expected. 91267






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ratingratingratingratingrating by: R Adams06/03/2014


High quality works great. 134138






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ratingratingratingratingrating by: Yoshino Keech08/02/2011


products ore exelent 20896






- 30637

ratingratingratingratingrating by: Rick S.11/10/2014


Just what I needed 160194






- 30637

ratingratingratingratingrating by: Greg06/02/2011


Great product 15971






- 30637

ratingratingratingratingrating by: bill dunne01/25/2011


fit perfect 6099






- 30637

ratingratingratingratingrating by: Joe11/19/2014


Just as described, 161795




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Ask the Experts about this Tow Ready Wiring
Expert Answers about Adapter 4 Pole to 6 Pole - 30637Do you have a question about this Wiring?


  • 6 Prong Square on Jayco Trailer to 4 Prong Flat Wiring Color Scheme
  • The wiring colors codes for the Jayco style 6-Way connector are not readily available. I can tell you that the following colors have worked out on a Jayco trailer before. Yellow - Not determined, Green - tail light, White - ground, Red - left turn and brake, Black - not determined and Brown -right turn and brake The leftover yellow and black wires would be used for auxillary power and backup lighting or trailer brake power, whichever is needed. You would need to use a circuit tester,...
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  • Why Does my 4-Way Connector Have 2 Wires Ran to One Prong for the Tail Light Circuit
  • It sounds like you need an Optronics wishbone wiring harness, part # A35W42B. This 4-Way has a prong that has two wires that come out of it. The reason some 4-Ways have two wires coming out of one port is because that prong represents the tail light functions for both sides of the trailer. So one wire would run to the tail lights on one side of the trailer, and the other wire would run to the other. I attached a video below that shows this product being installed onto a trailer and...
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  • Adapter for a 4-Way Flat Vehicle End Trailer Connector to 6-Way Round Pin Trailer Connector
  • If you only want to use the basic lighting functions provided by the 4-Way (left/right turn, brake, and running lights) then all you will need to do is plug the 4-Way end of the Adapter 4 pole top 6 pole, # 30637, into your vehicle 4-Way. The trailer 6-Way will then plug into the 6-Way receptacle on the adapter. You will also need to ground the white wire on the adapter to the vehicle frame at a clean and corrosion free metal surface. The remaining wires (blue for electric brakes and black...
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  • Adapter to Connect 4-Way on Vehicle to 6-Way Round on Trailer
  • A vehicle end wiring harness using a 4-Way Flat connector should have 3 female plugs and 1 male pin. A matching 4-Way Flat trailer connector would have 3 male pins and 1 female plug like on the Tow Ready Adapter 4-Way Flat to 6-Way Round, part # 30637. The # 30637 adapter is designed to plug into a 4-Way Flat on a vehicle and the 6-Way Round on the other end, with the male pins, will plug into a 6-Way Round on the trailer that has 6 female plugs. I am including a link to a FAQ page...
    view full answer...

  • Brake Controller Wiring on a 2002 Ford F-250
  • For the Pilot 2-6 Brake Electronic Brake Controller - Time Delayed # 80550 you can use Universal Brake Control Wiring Adapter # 20260. If you have factory 7-Way the only part needed to install a brake controller is the brake controller and wiring adapter. Usually the factory will already give you a brake control adapter that connects to the brake controller and plugs into the dash. If you do have this harness you can also use it with the Pilot. The OEM plug is on the drivers side, usually...
    view full answer...

  • Trailer Wiring Has 5-Wires White, Yellow, Green, Yellow/Brown, and Green/Brown
  • On a 4-Way flat trailer wiring harness, white is the ground, brown is running lights, yellow is left turn signal and green is right turn signal. It sounds like your trailer has a wishbone harness. A wishbone harness splits the running light circuit at the connector so you do not have to run a jumper from one side of the trailer to the other side. On a wishbone 4-Way connector the white wire is ground, yellow is left turn signal, yellow/brown is left side running lights, green is right...
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  • Wiring For the 2011 Jetta TDi Sedan for Towing a Trailer with Reverse Lights and Electric Brakes
  • The bypass that you mentioned is most likely the power wire that allows this harness to draw power directly form the vehicle battery and eliminate the possibility of overloading the sensitive circuitry and computers on your 2011 Volkswagen Jetta. The CURT wiring harness, # 56146KIT, is designed to work with your vehicles electrical system and does have the separate 12 volt power wire to protect your vehicle wiring. To tow a trailer with reverse lights you would need to use the Universal...
    view full answer...

  • Trailer Hitch, Drawbar, Hitch Ball, and Trailer Wiring Recommendations for a 2008 Jeep Commander
  • I can certainly point out everything you will need to tow the boat with your 2008 Jeep Commander. First, you will need a hitch. There are several available but I recommend going with a Class III hitch rated for weight distribution because you never know what you might be towing in the future. I would go with Hidden Hitch Trailer Hitch, # 87752. This is a Class III, 2 inch trailer hitch, capable of 500 pounds tongue weight capacity and 5,000 pounds gross trailer weight. When used with...
    view full answer...

  • What Adapter is Needed For Borrowed Trailer Pulled By Mercedes-Benz ML350
  • It sounds like you have a 7-way connector on your ML350. If the trailer you plan on towing has the female version of your connector then you will not need an adapter. The other possible situation is you have the 7-way male connector on your ML350 and the trailer has a 4-way. If this is the case then Hopkins # HM47365 should work. In order to determine exactly what will work with the trailer, we will need to know what connector is used on the trailer. Not all trailer companies use the...
    view full answer...

  • Adapter 4 Pole to 6 Pole # 30637 Recommendation and Wiring
  • It sounds like your trailer has a 6-way round connector and your truck has a 4-way flat connector. You could use an Adapter 4 Pole to 6 Pole, part # 30637, like what you referenced. If all you needed was tail light functions on your trailer you would simply mount the 6-way round of this adapter on your vehicle and secure the other wires up and out of the way, and then plug the 4-way from your truck into the 4-way of this adapter and then plug your trailer into the 6-way and you would...
    view full answer...

  • Wiring Up a Harbor Freight 4-Way Trailer Connector and Trailer Lights
  • Lets start with the trailer connector. I can tell you what the functions are so it will be easy to connect to the lights once we determine their functions. On a 4-Way, you will have one pin that is covered. That is the ground. Right next to it is the running light pin. Then the left turn/brake light pin. And the last pin is right turn and brake lights. Now, on the lights, since the common wire on both sides is red, I am inclined to believe this is the running light wire. What you...
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  • Availability of a 4-Way Flat to 6-Way Round Trailer Connector Adapter
  • We actually have a pre-made 4-Way to 6-Way round adapter that you could use if you wanted to, # 30637. For this you would plug in the 4-Way on the vehicle to the 4-Way on the adapter, ground the white wire to the frame of the vehicle, and tape up the other 2 wires on the adapter if those functions are not needed (if you just needed lighting functions). To make your own you would need a 4-Way trailer end connector, like # HM48110, and wire the blunt cut bare wire ends to the 6-Way round...
    view full answer...

  • Availability of Adapter For Connecting 6-Way Round on Trailer to 4-Way Flat on Tow Vehicle
  • I would recommend to use the Tow Ready 4-Way to 6-Way Adapter, part # 30637. If you only want to use the basic lighting functions provided by the 4-Way (left/right turn, brake, and running lights) then all you will need to do is plug the 4-Way end of the # 30637 adapter, into the vehicle 4-Way. The trailer 6-Way will then plug into the 6-Way receptacle on the adapter. You will also need to ground the white wire on the adapter to the vehicle frame at a clean and corrosion free metal surface....
    view full answer...

  • Availability of a 6-Round to 4-Flat or 7-Way to 4-Flat Trailer Connector for an RV
  • It sounds like what you want to do is to pull a trailer with a 4-Flat with an RV that has a 6-Round. 6-round connectors are not too common on RVs, but more common on horse trailers. Double check to see if you actually have a 7-Way blade style connector. A lot of connectors look alike. I have included a link to a Trailer Wiring FAQ article that, in part, discusses the various style connectors starting about 1/4 of the way down the page. To convert a 6-Round to a 4-Flat, you can use a...
    view full answer...

  • Wiring a 5 Wire Volvo Semi Tractor to a 4 Wire Gooseneck Trailer
  • To make the 5 Wire system on the Semi work with the 4 Wire system on the gooseneck trailer you will need to use a converter. The 4-Pole Hardwire Kit with Converter (Includes Tester), item # 119178KIT will provide you with a 4-Way connector that is converted to the 4 wire system on the trailer. You would then need to use either the Adapter 4 Pole to 6 Pole, item # 30637, or the Adapter 4 Pole to 7 Pole, item # 30717, to complete the conversion to the style of connector that is on the gooseneck...
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  • Should Adapter 4 Pole to 6 Pole, # 30637 Have Constant 12 Volt Power Even With the Key Off
  • I spoke with my contact at Tow Ready, and he stated that the Adapter 4 Pole to 6 Pole, # 30637, will have power at the 12 volt pin all the time if it is connected directly to the vehicle battery. This will not put a drain on the battery unless something is connected to the harness drawing power.
    view full answer...

  • Some Trailer Lights Are Not Working But Running Lights and Marker Lights Are Not
  • You are probably on the right track in thinking a grounding issue is at fault. Often if a trailer has a weak or marginal ground connection it will be able to pass enough current for lower current draw lights (such as the turn signals that are not on continuously) but not enough for the always-on running and marker lights. I suggest you recheck the security of the ground connections. You can try sanding off paint (or rust) at the spot where your ground wire ring terminals are attached....
    view full answer...

  • Wiring A 2008 Toyota Highlander for Towing a 1996 Flagstaff Cobra Camper with 6-Way Square Connector
  • Jayco uses a different wiring code than most, so in all likelihood, it will not work. I would just cut off the 6-Way square, tape off the brake and battery wires, and connect the 4 wires to a new 4-Way flat connector like part # 9653P. A better solution may be to install a more common 6-Way Round trailer connector on the vehicle and trailer. You could use the Pollak 6-Pole, Round Pin, Trailer Wiring Connector, item # PK11604, on the trailer end and a 4 Pole to 6 Pole Adapter, item #...
    view full answer...

  • Wiring a Brake Controller on a 2005 Dodge Ram with Factory 4-Way Connector
  • With the factory 4-Way connector you will need a brake controller with the proper wiring connection for Dodge vehicles. I would recommend the Tekonsha Prodigy, item # 90185 and adapter # 3020-P, for your vehicle. The adapter is a vehicle specific brake controller connector. You will also need a 7-Way, item # 30717, or 6-Way, item # 30637, adapter. With these parts you can use the specific instructions on our brake controller wiring page for 1995-present Dodge Ram trucks (see link). From...
    view full answer...

  • Troubleshooting Brake Light on Trailer Towed by 1998 H-D Road King and 2003 Ford Crown Victoria
  • Because the 2003 Crown Vic uses a separate bulb in the tail light assembly for the turn signals, a tail light converter is needed. If the 4-pole you have does not have a converter, and its simply been tapped into the turn and running light circuits, it would explain why the brake lights on any trailer you connect to the vehicle are not working. You can easily test this using a circuit tester like part # 40376. Attach the alligator clip on the tester to the ground pin on the connector (fed...
    view full answer...

  • Troubleshooting Plug and Play T-Connector Trailer Wiring Harness Not Working on a 1992 Toyota Pickup
  • As long as your vehicle is a 1992 Toyota Pickup and not some other model like a T100 pickup, you have the correct wiring harness. There are two possibilities for the symptoms you are describing. A ground issue or a short between the taillight circuit and turn signal circuits. Because there would need to be a short between both the left and right turn signal circuit and the ground I would think that would not be the issue, unless the converter box has been shorted out. Since you have...
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  • Adapting a 4-Way Flat Trailer Connector on 2011 Toyota Tacoma to 6 Round on 1983 Coleman Camper
  • Since your truck has a 4-Way flat connector and the trailer has a 6-Way round, adapter # HM47320 will not work. It is made to go from a 6-Way round on a vehicle to a 4-Way flat on a trailer. What you need is an adapter like # 30637. Your 4-Wway will plug into the adapter and you will need to ground the white wire to the truck frame. The other two wires on the adapter are black for 12 volt power and blue for electric brakes. If you do not wish to use these functions then you can tape...
    view full answer...

  • Trailer Right Turn and Brake Lights Not Working When Connected to 1997 Ford Explorer
  • Since you have indicated that the right turn and stop light circuits work on the vehicle the next step is to test the connector on the vehicle side using a circuit tester like # 3808. If the circuit is working there as well then the problem is on the trailer. If it is not then the problem is on the vehicle. If it is not working on vehicle connector and the connector is factory, then you may have some relays or fuses blown or missing that need to be replaced. Check your owners manual...
    view full answer...

  • Availability of a Replacement Jayco 6-Way Trailer Side Connector
  • Jayco is the only manufacturer that uses that type of 6-Way connector. We do not have a replacement that is going to work. Since yours is broken this is the perfect time to install a 7-Way connector on the trailer so you do not have to mess with various adapters. If you do not want to change to a 7-Way on the trailer then you would need to get a replacement trailer side Jayco 6-Way from Jayco. But to add a 7-Way RV style connector to the trailer you can use something like # H20042. You...
    view full answer...

  • Troubleshooting No Turn or Brake Lights on a Cargo Trailer
  • The brown wire that is running to both the left and right side of your trailer is the tail light circuit. The green wire that is on the right side is the stop/turn circuit and the yellow wire on the left is the stop/turn for that light assembly. The best place to start when troubleshooting wiring problems is to start at the trailer connector on your tow vehicle and test the poles of the connector to confirm the problem is on the trailer or the vehicle. Check out the video I attached...
    view full answer...

  • Adapting a 7-Way Trailer Connector on a 2010 Chevy Suburban to a 6-Way Square Jayco Connector
  • I do have a solution for you but it a little unorthodox. First, you will need to use a 7-Way to 4-Way adapter like # PK12716. With the 7-Way now converter down to a 4-way, you can use the 4-Way to 6-Way Jayco adapter, # 30104. To make it more like one large adapter, you can use dielectric grease, # 11755, between the 4-Way connections on the 2 adapters and then use electrical tape to wrap up where the two are joined at the 4-Ways. This will only give you the basic lighting functions...
    view full answer...

  • Wiring a 4-Way to a 6-Way on a 2004 Tacoma Pickup
  • When you plug in your properly functioning 4-way connector to the adapter the yellow, green, brown and white wires should function properly through the 6-way connector. You will then need to connect the black 12 volt power and the blue trailer brake wires. The black wire is the battery lead and is ran to the positive terminal of the battery for charging the battery of the trailer. The blue wire is connected to the blue wire supplying power to the brakes from the brake controller if your...
    view full answer...

  • Installation of Wire Connection on Vehicle to Recharge or Power Trailer
  • You will need to run a fused wire, item # 31827, from the vehicle battery to the vehicle trailer connector that matches the trailer connector on the trailer that you want to charge the battery on and power. You can select the proper vehicle end to connect to your trailer from our (see link) trailer connectors page. If you have the 6-way round connector the black, center pole, wire will run to the power wire you install.
    view full answer...

  • Wiring Connections For Wishbone Harness To Use On Trailer Wiring
  • It sounds like you have a wishbone harness. On a typical 4-way connector, you would have a yellow wire that would be for a left turn and left brake light signal, and a green wire for the right turn and right brake light signal. You would also have a single brown wire for the running lights and a white wire for the ground. A wishbone connector will have a brown/green wire for the running lights on the right side, and a yellow/brown wire for the left side running lights. you will also...
    view full answer...

  • Converting 4-Way Flat on a 2005 Honda Pilot to a 5-Way or 6-Way Round Trailer Connector
  • If the trailer does have a 6-Way round then you can use adapter # 30637. This will give you the basic light functions but unless you connector the other wires on the adapter and use a brake controller you will not be able to use the trailer brakes, if equipped, or provide 12 volt power to the trailer. The white wire on the adapter must be connected to the vehicle frame. The black wire on the adapter connects to the positive terminal of the vehicle battery via a 40 amp circuit breaker...
    view full answer...


Expert Answers about Adapter 4 Pole to 6 Pole - 30637Do you have a question about this Wiring?



Info for this part was:


Expert Research:
Michael L

Expert Research:
Robert G

Expert Research:
Michael H

Expert Research:
Jeff D

Expert Research:
Jameson C

Expert Research:
Lori W

Expert Research:
Jeffrey L

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