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Adapter 6-Pole Round to 4-Flat with Cover

Adapter 6-Pole Round to 4-Flat with Cover

Item # 47305B
Our Price: $11.68
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Trailer Wiring
Shipping Weight: 0.21 lbs
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Hopkins Trailer Wiring - 47305B
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Great Prices for the best trailer wiring from Hopkins. Adapter 6-Pole Round to 4-Flat with Cover part number 47305B can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (21)
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  • Videos (2)
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Hopkins Trailer Wiring - 47305B

  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • 6 Round
  • Hopkins


  • Adapts 6-pole round adapter on your vehicle to 4-pole flat
  • Includes 4-pole cover

Replaces 47309 and 37308

47305 Hopkins Adapter 6 Pole Round to 4 Flat

California residents: click here

Video of Adapter 6-Pole Round to 4-Flat with Cover

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

Video Transcript for Hopkins Wiring - Wiring Adapters - 47305B Review

Today we're going to be taking a look at Part Number 47305B, this is the Hopkins Adapter. It's going to adapt your 6-pole round connector on the vehicle to your 4-pole flat. It's got the nice little dust cap that's going to protect the connection points when it's not being used. Removing the dust cap from the connector is going to expose our 4-pole flat connector. This unit's going to be made from a strong ABS plastic construction for strength and durability. It's also going to feature an impact and corrosion resistant design.

Here on the 4-pole flat side we're going to have the finger tabs, that allows us to get a nice solid grip on there. It allows for easy installation and removal. If we take a measurement of the overall length, it's only going to give us a measurement of about 3 inches long. Very simple installation though, this end right here is going to plug into your vehicle. You can see there that it has slots for all 6 pins, but only 4 of those have the terminals in it. That's because the 4 way connector is only going to use 4 functions or 4 signals.

It's only going to send back what it needs to, this end plugs into the vehicle. Then that's going to send the power to this connector right here and then you can plug in whatever you need to to this side and extend your power to your towing application. That's going to do it for today's review of Part Number 47305B.

Customer Reviews

Adapter 6-Pole Round to 4-Flat with Cover - 47305B

Average Customer Rating:  4.9 out of 5 stars   (21 Customer Reviews)


great adapter


Thank you for the fenders they worked out great they made my trailer to turn out great


Another great Hopkins product. I always look for Hopkins items when I have a need for trailer lighting or wiring repairs or replacements...Top Shelf. reasonably priced and durable. Thanks etrailer


The product was exactly what I ordered but Unfortunately I requested an six pin round adapter to a four pin flat when I should have requested a converter because my RV has separate brake and turn lights and my tow lights are single turn/brake lights.


One year later, and it is still performing wonderfully!
For whatever reason, the shape of it prevents my standard socket lid from locking down 100%, but it fits very snuggly and I wouldn't be concerned unless is driving across the country with it.



One year later, still working great! Ive only had to use it a few times, but the material has held up, stored mostly in a bag.


Quick shipping, good pricing and in stock! Thank you!


Very pleased I ordered an adapter for my trailer lights I couldn't find one locally but found exactly what I needed on and was delivered in two days will make additional orders in the future if needed


I am pleased with the two items that I ordered. Instead of having to change out my outdated plug, I was able to find adapters for my various trailers instead.


Just what I needed and the product arrived very fast. I looked several other places for this adaptor and was the only place with it and I'm very pleased.


Great product for the price, easy to install. As always with ETrailer quick service and great to deal with thanks again!


James did a great job helping me find what I needed, and I got it yesterday it fits great. Thank you James. You made this task effortlessly.


As expected, this item was top shelf.
Price was terrific, can't say more.


Went right into place and worked great.


As simple as this adapter is what's to say it is good quality and it works


Working Well


Great product and wonderful service thanks Charlie


Great Product


It's the one I wanted and it works.


Looks like it is going to work great.




See what our Experts say about this Hopkins Trailer Wiring

  • Adapting a 6-Way Round Trailer Connector to a 4-Way Flat on a Winnebago
    To adapt a 6-Way round trailer connector to a 4-Way flat, you will just need an adapter like # 47305B that you have referenced. The turn signals and brake lights on the Winnebago do not matter because the signals at the trailer connector are already converted to have the brake lights and turn signals on combined circuits which is what trailers use.
    view full answer...
  • Trailer Connector Adapter for a 1994 Ford F-250 to Tow a Boat Trailer with a 4-Way Connector
    The easiest way to tow your boat that has a 4-way trailer connector using your 1994 Ford F-250 with a 6-way connector is to use an adapter like # 47305B. If you have the more common 7-way blade connector on your truck you can use # 47345. Either simply plug into the truck's connector then you connect the trailer's 4-way. Since they're small they can easily be stored when not in use. The best part is whichever one you need will make you legal.
    view full answer...
  • How Does 6-Way to 4-Way Adapter Work
    The 6-Way is not wired as you think. One is for ground, one is for tail light, one is for R turn/brake, one is for left turn/Brake, one is for trailer brakes, and the last is for either reverse lights or 12V power. The last wire may be omitted if not needed. A 4-Way has the following wires: White - ground, brown - tail light, green - right brake/turn and yellow - left brake turn. Turn signals, in essence over ride the brake signal since they are the same bulb or filament. Because they...
    view full answer...
  • 6-Way Round to 4-Way Flat Adapter Recommendation for a Camper
    If you are looking for a way to convert the round 6-way on your camper to a 4-way you would need a product like the Adapter 6-Pole Round to 4-Flat # 47305B. The 6-way male end of this adapter will plug into the 6-way on your camper and will provide a 4-way connection on the opposite side of the connector. The Wiring Harness part # 118391 that you referenced would not work for you as it is a wiring harness designed for Chevy Equinoxes.
    view full answer...
  • Ball Mount and Trailer Connector Adapter Recommendation for 2014 Mercedes GLK 350
    It is important to choose a ball mount with the correct rise or drop needed so you can tow your trailer level. You will want to measure your hitch height, as well as the height of your trailer's coupler. The difference between these two heights will let you know which drop or rise you will want. I have attached a help article on finding the correct ball mount. You will also want to know the weight of the trailer you are towing. This is important to make sure you do not exceed the towing...
    view full answer...
  • No Brake Light Function on 6-Way Round Trailer Connector on Chevy Motor Home
    It sounds like there is a blown stop light fuse on the Chevy motor home. Use the owners manual or the legends on the power distribution box lid/in-cab fuse panel to locate any and all tow package wiring fuses so you can check them. If that is not the problem it is possible that the 6-Way on the motor home has separate brake light and turn signal circuits. You would need to test the other pins to determine if any of them carry a brake light signal. If there are separate circuits for turn...
    view full answer...
  • Adapter for a 6-Way Round on a Harley Davidson Trike to a 4-Way Flat Trailer
    It does not appear that any of the 6-Way to 4-Way adapters are going to work because of the unique pin out that is on the 6-Way on your 2013 Harley trike. You would essentially need to make an adapter to match the pin out. You will need a trailer side 6-Way, # PK11604, and a vehicle side 4-Way, # 18172, cut to the length you need. Then you just attach the wires in the right place to match the 6-Way you have. On the 4-Way end the white wire is ground, yellow is left turn and stop, green...
    view full answer...
    Image 1 for
  • Towing a Trailer with a 6-Pole Trailer Connector with a Vehicle That has a 4-Way Connector
    Actually you need part # 37175. It plugs into your vehicle's existing 4-way and gives you a 6-way round. There are 3 extra wires; blue for trailer brakes, red for an auxiliary (usually 12 volt power), and a white for ground. The white wire needs to be grounded to the vehicle's frame from the connector to function. The other two can be capped off if you're not going to be use them. If you do need the other two wires the blue is run to the vehicle's cab and connected to the blue wire...
    view full answer...
  • Does Brake Output Pin of Winnebago Motorhome Tie Into Stoplight Circuit
    I'd be shocked if your brake controller output pin on your trailer wiring was wired to the stoplights as that would lock up the trailer brakes any time the brakes were touched. Trailer brakes will normally lock up at 12 volts so you need a brake controller to gradually ramp up the voltage to apply the brakes smoothly like with something like the Brake EVN # TK63VR. Also if the RV has trailer wiring the stoplights and turn signals would be combined on the same circuit for the wiring of...
    view full answer...
  • Troubleshooting Trailer Wiring Connection for Lack of Brake Lights
    The Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole # HM47320 and the other adapter you used most likely are not the issue. I recommend testing your 6-way connector with a circuit tester like # PTW2993 to ensure you have both brake and turn signal function on each of the lower pins. If you have both the right turn and stop and the left turn and stop, then we know your vehicle connection is good. Since we know your trailer works with other vehicles,...
    view full answer...
    Image 1 for
  • How to Connect an RV with a 6-Way Trailer Connector to a Flat Towed Vehicle with a 4-Way Connector
    To connect your RV to your flat towed vehicle you will need a 6-way to 4-way adapter on the RV, like part # 47305B. Then to connect from the adapter to the front of your towed vehicle you can use the Roadmaster Extension Loop for Towed Vehicles # RM-300150-00. This has a 4-way vehicle side connector on each end.
    view full answer...
  • Trailer Wiring Harness Recommendation for a 2004 Pontiac Montana
    Actually, all you will need to do is install a wiring harness, # C55355, on your 2004 Pontiac Montana. But if you wanted to use those factory wires, because you have separate wires for turn signals and brake lights, you would first need to install a converter. The converter, # RM-732, takes the separate signals and combines them which is what a trailer uses. To wire it up your yellow wire will go to the yellow wire on the converter, green will go to green, white will go to white, and red...
    view full answer...
  • 6-Way to 4-Way Adapter Recommendation for RV Flat Towing Vehicle
    To adapt a 6-Way round trailer connector to a 4-Way flat, you will just need an adapter like # 47305B that you have referenced. The turn signals and brake lights on the Winnebago do not matter because the signals at the trailer connector are already converted to have the brake lights and turn signals on combined circuits which is what trailers use. If for some reason you had separate trailer wiring on the RV you would need to make an adapter. You would need an adapter # RM-732 and a part...
    view full answer...
  • Adapting Motorcycle with 4-Pole to Trailer with 6-Way Connector
    You will need a converter/adapter when connecting different wired vehicles. Depending on how your vehicle and trailer are wired we have three 4 to 6 wire adapters. Adapter 4 Pole to 6 Pole # A10-6034VP Adapter 4 Pole to 6 Pole and 4 Pole Trailer Wiring Adapter # 37175 If your trailer has brakes, you will need a brake controller and for a motorcycle you will need a model that has time delay functionality. I would recommend the Activator IV by Draw-Tite, part # 5504. This will work with...
    view full answer...
  • Adapting Different Connectors on 2014 Mercedes GLK250 and Prolite Suite Trailer
    Vehicle and trailer connectors come in several varieties, including both 6-way round and 7-way blade types. The linked article on trailer wiring illustrates both, as well as other types. These two types are NOT compatible with each other. Within each type of connector sizes are usually standardized, although the actual wire configuration (what particular signal is carried by any given pin/wire) can vary by brand. My associates and I have not heard of this issue before but certainly a...
    view full answer...

Do you have a question about this Trailer Wiring?

Info for this part was:

Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Joshua S
Video Edited:
Joshua S
Employee Nicholas E
Test Fit:
Nicholas E
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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