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Pollak 9-Pole, Round Pin Trailer Connector - Trailer End

Pollak 9-Pole, Round Pin Trailer Connector - Trailer End

Item # PK12906
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Establish a secure connection between your semi trailer and tow vehicle with this heavy-duty, 9-pole plug. Plug has round, floating pins to promote easy alignment, ensure minimum voltage drop and provide the most positive contact. Lowest Prices for the best trailer wiring from Pollak. Pollak 9-Pole, Round Pin Trailer Connector - Trailer End part number PK12906 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (34)
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Pollak Trailer Wiring - PK12906

  • Trailer Connectors
  • Trailer End Connector
  • 9 Round
  • Plug Only
  • Pollak

Establish a secure connection between your semi trailer and tow vehicle with this heavy-duty, 9-pole plug. Plug has round, floating pins to promote easy alignment, ensure minimum voltage drop and provide the most positive contact.


  • Heavy-duty, 9-pole plug connects semi trailer to socket on tow vehicle
  • Round, floating pins
    • Ensure minimum voltage drop
      • Terminals designed for (2) 8-gauge, (2) 12-gauge and (5) 14-gauge wires
    • Promote easy alignment
    • Provide the most positive contact
  • Spring-loaded contacts
    • Completely field serviceable for easy repairs
  • Black plastic housing
    • Tapered design with jumbo, finger-pull grips
      • Easy hand-position pull
      • 2 Hang-up holes


  • Wiring configuration:
    • Color - circuit - recommended wire gauge:
      • White (ground): 8-gauge
      • Blue (electric brakes): 12-gauge
      • Green (tail lights): 14-gauge
      • Black (battery charge): 8-gauge
      • Red (stop / left turn): 14-gauge
      • Brown (stop / right turn): 14-gauge
      • Yellow (auxiliary): 14-gauge
      • Gray (auxiliary): 12-gauge
      • Orange (reefer or stop): 14-gauge
  • 1-Year limited warranty


12-906 Pollak 9-Way, Round Pin Trailer Connector - Trailer End

Customer Reviews

Pollak 9-Pole, Round Pin Trailer Connector - Trailer End - PK12906

Average Customer Rating:  4.8 out of 5 stars   (34 Customer Reviews)

Establish a secure connection between your semi trailer and tow vehicle with this heavy-duty, 9-pole plug. Plug has round, floating pins to promote easy alignment, ensure minimum voltage drop and provide the most positive contact.


Worked great..... used it on a farm tractor and planter to replace the John Deere plug that was bad. [...] wanted $508.82 for their replacement plug and as you know I have $26.50 in yours, freight included. Made a new bracket, put it on and went back to work. THANK YOU

Still works just fine and am very pleased with it THANKS AGAIN
Den R - 01/19/2018


I was looking for a solution to charging my 12 volt camper refrigerator while on the road and to provide power to my trailer lights. This part became the solution. It is well built and the instructions on the e trailer web site helped a great deal. Thank you!!


great product


These connectors completed the job of connecting my 4 camera CCTV backup system with multiplexer from my trailer to the truck cab. I needed nine wires to accomplish this function. It is too bad that you didn't carrying the 9 wire cable, but I found a company that carried it on the web.


Spent about 4 hours and 6 or 8 phone calls with no luck in solving my camper wiring hook up issue. No one could offer me the product solution I needed. That was until I started searching your on line product offerings, and there it was... just what I needed at a wonderful price. I knew it would work because your website gave such a thorough description. I ordered... (the shipping was about $3) and it was exactly what I needed and thought I was getting. My purchase came wonderfully packaged and 2 days earlier than the promised date. Thoroughly satisfied and will buy from this company again.

by: 08/24/2021

It was exactly what we needed for the trailer. Very satisfied!!


Sorry for not getting back to you sooner, but we have been busy chopping corn and the plugs that I got from you were to rewire a chopper that's why I needed a 9 pin connector I finished it the other day and we tried it today and everything works so I 'am very pleased with the parts thank you and I was very happy with the very quick delivery. Thanks again


great service !!!


This Pollak 9-pole connector was a hard to find item at Autozone and other parts stores, even U-Haul did not carry this kind of trailer connector.



Used to replace 9 pin plug on my
Fisher plow.
Works perfect & cheap fix


I only had to swap a burned out unit for a new one. The switch was easy. Some of the wires were lose in their holes so I striped extra length and folded the bare wire to make solid connections.


As good or better than any other Plastic plug . I used it for a non typical application but I think its a good plug .


Very nice connectors, easy to use and great labeling to help wire them. These can be used for a variety of applications, not just trailers.


This was a hard to find product, made easy by

Thank you for your attentive dedication, fast delivery.


Excellent transaction!!


hard to find 9 way plug, quality is decent, shape is right and has all needed parts to wire up to a supply cable, great price


I have ordered these 9 pole connectors twice from this vendor and both the product and service have been first class.


Worked perfect for fixing the connecter on our Dicki-John material manager on a Jd 7000 -6


Exatcly what I needed could not find one anywhere or anyone that had ever heard of this item


Arrived promptly and in excellent condition. Will definitely order more parts as needed.



Product worked great. Service was wonde rful



Excellent product,.packed very good


just what I needed

Show More Reviews

Ask the Experts about this Pollak Trailer Wiring

  • How to Determine What the Orange Wire of Trailer Wiring Circuit is on Trailer with 9-Way
    The colors of the wires used for wiring up a trailer can vary widely among trailer manufacturers. Especially on a trailer as old as yours where someone could have rewired the connector with whatever wire was convenient. To determine the function of the wire you can trace it back to see where it terminates or you can use a jumper wire from the positive post of a vehicle battery to put 12 volts on that wire to see what circuit activates. Typically on a trailer with a 9-way installed the...
    view full answer...
  • Troubleshooting Brake Controller that Intermittently Says it is Not Connected
    There is a loose wire or an intermittent connection somewhere on the brake output circuit of your tow vehicle/trailer. That is what is causing the controller to periodically display that it is not connected to a trailer. If a wire once vibrated loose I would first inspect the condition of the wiring of both connectors and clean of any corrosion you find as that is the usual problem. Most likely the actual problem is not the connectors and is just the wiring/corrosion. I also attached...
    view full answer...
  • The Best Way to Wire a 9-Way Vehicle Connector to a Trailer Side 9-Way Connector
    The numbers that are given behind the colors for wiring chart of this Pollak 9-Pole # PK12907 are the gauge wire that is recommended you use for that circuit. If you need the matching 9-way trailer connector you would want a Pollak 9-Pole, Round Pin Trailer Connector # PK12906. There is not a standard wiring for 9-ways, you will need to wire the # PK12907 by function to the corresponding trailer 9-way connector. I attached an FAQ on trailer wiring that you might find helpful also.
    view full answer...
  • How Big is the Opening On the Back of the 9-Pin Connector PK12906 for Wire to Pass Through
    I went out into our warehouse to measure the diameter of the opening on the back of the Pollak 9-Pole # PK12906 that you referenced and found it to be 3/4 of an inch. The socket part # PK12907 is made of ABS plastic.
    view full answer...
  • Convert a 7-Way Connector to a 9-Way Trailer Connector for a 1985 Fireball Travel Trailer
    We do carry a couple of 9-Way connectors. The one you would need to add to your 2001 Ford would be part # PK12907. The wire color code is listed on the product page, but 9-Way connectors are very uncommon now, so I could not find information as to which position the wires should connect to. What you can do, is pull apart the trailer connector and wire the vehicle 9-Way as a mirror image so that the wires match up when the two connectors are attached. And in case you need to replace,...
    view full answer...
  • Adding a 4-Way Flat Trailer Connector to a 1992 Chevrolet C/K Series Cab and Chassis
    A 9-pole to 4-Way flat adapter is not available since it is a combination that is quite rare. You would either have to make one or install a separate 4-Way. The easiest solution would be to install the Tow Ready Custom Fit Vehicle Wiring, # 118315. I have included a link to the installation instructions for you. The 4-Way plugs in line with the tail light wiring on your 1992 Cab and Chassis model Chevy C/K.
    view full answer...
  • 9-Way Round Pin Trailer Connector for Boat Trailer
    You can get a 9-wire trailer plug right here; the 9-Pole, Round Pin Trailer Connector - Trailer End # PK12906 I have added a link to a video review of this connector for you to check out.
    view full answer...
  • Availability of 9-Pole Round-Pin Trailer Connectors
    We do offer 9-pole round-pin trailer connectors, both the vehicle side # PK12907 and the trailer side # PK12906, both from Pollak. These are covered by a 1-Year limited warranty.
    view full answer...
  • Availability of Wiring Adapter to Convert 7-Way RV Connector to 9-Pole Round Pin on 1984 Jayco
    9-pin connectors are rare these days. We do still offer vehicle and trailer side connectors of this type, such as # PK12907 and # PK12906, but we do not have any adapters that can convert your truck's 7-way blade-style RV connector to a 9-pole round pin type. A 9-pole connector like # PK12906 has two extra circuits (auxiliary on the gray wire and reefer on the orange) that would not be supported if fed by a 7-way socket. You'll want to swap out the truck connector using part # PK12907.
    view full answer...
  • Availability of Recoil Wiring for 9-Way Pollak Connector PK12907
    We do offer the 9-Way vehicle and trailer plugs, but we do not offer a pre-made wiring harness that would plug between your tractor and trailer. We do not offer any bonded, coiled wiring, but we do offer various wire styles by the foot. If you could locate the appropriate length of coiled wiring, you could create your own harness using vehicle end # PK12907 and trailer end # PK12906. The recommended wire colors and sizes for a 9-Way connector would be: White - Ground Return - 8 gauge Blue...
    view full answer...
  • Recommended Parts to Make a Vehicle 9-Way Connector to Trailer 7-Way Connection Adapter
    We do not have an adapter, but you can easily make one using the Pollak 9-Pole, Round Pin Trailer Connector - Trailer End # PK12906 and the Hopkins Adapter 4-Pole to 7-Pole and 4-Pole # 37185. On a standard 9 way, the following connections are made: White - Ground Blue - Electric Brakes Green - Tail, License and Running Lights Black - Battery Charge Red - Stop and Left-Hand Turn Signal Brown - Stop and Right-Hand Turn Signal Yellow - Back-up, Auxiliary Ground or Circuit Gray - Auxiliary...
    view full answer...
    Image 1 for
  • Installing 4-Pole Trailer Connector on 2002 Chevy Silverado with No Trailer Connector
    If your Silverado has the factory plug located above the spare tire, the easiest way to install a 4-pole would be to use the Tow Ready # 118384. Simply remove the protective cap covering the plug, plug in one of the connectors on the Tow Ready Harness and run the 4-pole to the desired location. If there is nothing but the harness above the spare tire with no plug on it, the wiring from the 4-pole like part # 18002 would connect to the factory harness color for color, yellow to yellow,...
    view full answer...
    Image 1 for Image 2 for
  • Charging Trailer Batteries From Tow Vehicle and AC Outlet
    In order to charge your trailer batteries from the 9-Way on your tow vehicle while in transit, you will just need to run 10 gauge wire like # 10-1-1 (sold by the foot) from the vehicle battery's positive terminal to the 12V power circuit of the 9-Way (if not already done). You will then run wiring from the 12V pin on the trailer 9-Way to your batteries. Keep in mind that this will provide a maintenance charge while towing but it won't be enough to charge up a dead battery. You are correct...
    view full answer...
  • Wiring 2001 Ford Ranger to Tow a Trailer with a 7-Way Blade, 7-Way Round, or 9-Way Round Connector
    9-Way trailer connectors are pretty rare, limited to big rig trailers and large RVs. A quick double check will confirm if the trailer has a 7-Way blade like # 37185, 7-Way round like # 47595, or a 9-Way round like # PK12906. For a 7-Way blade style, you will need to install a 7 and 4 Way Installation Kit, # ETBC7. Your existing 4-Way plugs into the back of the ETBC7 and then you will need to hardwire the remaining wires. White is grounded to the vehicle frame, yellow is for reverse lights,...
    view full answer...
  • Upgrading a 2010-2016 Ford Super Duty to 9-Pin Wiring With Separate Center Brake Light Pin
    When upgrading your factory 7-way to a 9-way # PK12906 and # PK12907 as you referenced, there would need to be a separate harness made. To separate out the brake light for that separate pin, you would need to use the Curt Vehicle to Vehicle Tail Light Converter # C56196. This will give your the separate signal for the center brake light you mentioned. The other couple pins can be configured as you stated for refrigeration or aux power as you stated. For another 12V power, you will simply...
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Tyler C
Written by:
Tyler C
Employee Cole B
Installed by:
Cole B
Employee Wilson B
Updated by:
Wilson B

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