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  1. Custom Fit Vehicle Wiring
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  3. 7 Round to 7 Blade
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  5. Wiring Adapters
  6. Plug and Lead
Custer Trailer Connector Adapter - 7-Way Round to 7-Way Blade
Custer

Custer Trailer Connector Adapter - 7-Way Round to 7-Way Blade

Part Number: ADP7R-7B
In Stock
$82.71
Custom Fit Vehicle Wiring
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This adapter converts your 7-way round pin connector to a RV-style, 7-way blade connector. Built-in ABS plastic cover protects the 7-way blade terminal from dust and moisture. Pull grips on the round end make the plug easy to install and remove. 1-800-940-8924 to order Custer custom fit vehicle wiring part number ADP7R-7B or order online at etrailer.com. Free expert support on all Custer products. Great prices and Fastest Shipping for Custer Trailer Connector Adapter - 7-Way Round to 7-Way Blade. Custom Fit Vehicle Wiring reviews from real customers.
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  • Reviews (24)
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Custer Custom Fit Vehicle Wiring - ADP7R-7B

  • 7 Round to 7 Blade
  • Universal Fit
  • Wiring Adapters
  • Plug and Lead
  • Custer

This adapter converts your 7-way round pin connector to a RV-style, 7-way blade connector. Built-in ABS plastic cover protects the 7-way blade terminal from dust and moisture. Pull grips on the round end make the plug easy to install and remove.


Features:

  • Adapter converts your 7-way round pin connector to a 7-way RV-style connector
  • Built-in cover protects the 7-way blade end from dirt and moisture when not in use
    • Hinged cover opens 180 degrees for effortless connection
  • Pull grips on the 7-way round pin connector make plug easy to install and remove
  • ABS plastic construction is strong and durable
  • Flexible wire between plugs provides wide range of motion


Specs:

  • Overall length: 14"
  • Length between the plugs: 6"


This adapter allows the 7-Way, round-pin, vehicle-end connector to work with the 7-way blade, RV-style, trailer-end connector on the right.


7-Way, Round-Pin, Vehicle-End Connector7-Way, RV-Style, Trailer-End Connector

ADP7R-7B Custer Trailer Connector Adaptor with Dust Cover - 7-Pole Round to 7-Blade




California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.9

24 reviews
This adapter converts your 7-way round pin connector to a RV-style, 7-way blade connector. Built-in ABS plastic cover protects the 7-way blade terminal from dust and moisture. Pull grips on the round end make the plug easy to install and remove.

by:

very helpful and good communication.



by:

The 7 round to 7 way blade adapter works excellent.

Dennis profile picture

Dennis

2/9/2025

We hook a tractor to our flatbed gooseneck trailer to haul bales, nice to have lights and turn signals.

Robin H. profile picture
Etrailer Expert

Robin H.

2/9/2025

@Dennis definitely nice. Glad to hear it is working well.


by:

As has been typical w eTrailer, received our product in a very timely quick manner, and was as ordered. This pigtail is of good quality, and worth the little extra $ over cheaper variants. Works the treat in connecting our road trailers to our farm tractor so we have lights and turn signals for our on road transits of these trailers w our Farm tractor. Dump trailers, horse trailers, flat bed trailers etc.

Wes profile picture

Wes

3/8/2024

This item has stood up well to heavy use and weather exposure over the last year since purchase !

Jesse M. profile picture
Etrailer Expert

Jesse M.

3/12/2024

@Wes Thanks for sharing! Glad to hear this item is still working well for you.


by:

Love this adapter. I use it to haul my dump trailer and flatbed trailers with my tractor, and it's exactly what I needed to do so to have active ligjts and brakes from tractor to trailer. Highly recommended



by:

Bought to connect trailer wiring to aJohn Deere 5075. Checking wires now just in case I need to switch any wires as suggested on note attached to the connector. Left turn right turn are correct. Think the 12v needs to be switched, I think its wired to electic trailer brakes. Excellent product.



by:

I am using these adapters to allow Custer wireless rechargeable tail lights to function on the back of my farm silage wagons when hauling from the chopper. The sending units for the lights are “ truck type” 7 pin flat whereas tractors are 7 pin round. A possible suggestion would be to make the cord on the adapter about 5 feet long to allow the transmitter to be located higher on the cab post and out of the heavy steel and cast iron congested area at the back of the tractor. So far the units are working well. Thank you



by:

The trailer connector is exactly what we ordered. etrailer customer service was great all the way around. Shipping was fast and showed up on time.



by:

Excellent quality. Great company to do business with. They care what people think of their products and service! Thank you!



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Awesome product



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Got it quick



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as expected totally happy



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Info for this part was:

Employee Jeff D
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Employee Cole B
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Employee Jameson C
Expert Research:
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Employee Adam R
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