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Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End

Item # PK12907

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Product Images

pollak wiring 9 round 9-pole pin trailer socket - vehicle end
pollak wiring vehicle end connector 9 round pk12907
pollak wiring vehicle end connector 9 round
pollak wiring trailer connectors
pollak wiring trailer connectors 9 round 9-pole pin socket - vehicle end

Customer Photos

pollak wiring trailer connectors 9 round pk12907
pollak wiring trailer connectors 9 round 9-pole pin socket - vehicle end
pollak wiring vehicle end connector 9 round pk12907
pollak wiring trailer connectors 9 round pk12907


  • Trailer Connectors
  • Vehicle End Connector
  • 9 Round
  • Plug Only
  • Pollak
Establish a secure connection between your tow vehicle and trailer with this 9-pole, RV-style socket. Socket has spring-loaded contacts and floating pins to provide easy alignment, ensure minimum voltage drop and promote the most positive contact. Lowest Prices for the best wiring from Pollak. Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End part number PK12907 can be ordered online at or call 800-298-8924 for expert service.

  • All Info
  • Reviews (21)
  • Q & A (13)
  • Videos (1)
  • Photos
  • Why etrailer?

Pollak Wiring - PK12907

Establish a secure connection between your tow vehicle and trailer with this 9-pole, RV-style socket. Socket has spring-loaded contacts and floating pins to provide easy alignment, ensure minimum voltage drop and promote the most positive contact.


  • Heavy-duty, 9-pole plug connects tow vehicle to semi trailer
  • 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


  • Wiring configuration:
    • Color - circuit - recommended wire gauge:
      • White - Ground Return - 8 gauge
      • Blue - Electric Brakes - 12 gauge
      • Green - Tail, License and Running Lights - 14 gauge
      • Black - Battery Charge - 8 gauge
      • Red - Stop and Left-Hand Turn Signal - 14 gauge
      • Brown - Stop and Right-Hand Turn Signal - 14 gauge
      • Yellow - Backup, Auxiliary Ground or Circuit - 14 gauge
      • Gray - Auxiliary Circuit - 12 gauge
      • Orange - Reefer (tag) or Stop - 14 gauge
  • 1-Year limited warranty

12-907 Pollak 9-Way, Round Pin Trailer Socket - Vehicle End

Video of Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End

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

Video Transcript for Pollak Wiring PK12907 Review

today we'll be reviewing part number PK12907. This is the Pollak 9-pole round pin trailer socket. The heavy duty 9-pole plug connects the tow vehicle to a semi-trailer. It's got the round floating pins. It's going to ensure minimum voltage drop. These terminals are designed for two 8-gauge wires, two 12-gauge wires, and five 14-gauge wires.

It's also going to promote easy alignment and provide the most positive contact. You can see back here that we have this spring-loaded contact so it's going to be completely field serviceable for easy repairs. It's just got hat set screw that you can tighten or loosen up. Comes in a black plastic housing with the mounting holes. Those mounting holes, measuring this distance center on center are going to be separated by an inch and a half.

Measuring this way center on center is going to be two and a quarter. The wire configuration for the color circuit and recommended wire gauge: Your white wire is going to be a white wire with 8-gauge. Blue is for electric brakes, 12-gauge. Green is tail light, license, and running lights, 14-gauge. Black is for battery charge; we recommend 8-guage. Red is going to be for stop and left hand turn signal.

Brown is going to be for stop and right-hand turn signal. Yellow is going to be for back-up, ground, auxiliary, or circuit. For all of those we recommend 14-gauge. Grey is going to be for an auxiliary circuit; we recommend 12-gauge. Orange is for a refer tag or stop and we're going to recommend 14-gauge for that.

You can also see here that the housing has nice spring-loaded lid so it's going to provide great protection from the elements which is going to protect our connection points here on the inside of our 9-pole plug. That's going to do it for today's review of part number PK12907. This is the Pollak 9-pole round pin trailer socket. .

Customer Reviews

Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End - PK12907

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

Establish a secure connection between your tow vehicle and trailer with this 9-pole, RV-style socket. Socket has spring-loaded contacts and floating pins to provide easy alignment, ensure minimum voltage drop and promote the most positive contact.

- PK12907


Awesome product! Used it for wiring on my farm tractor. 501027

- PK12907


Fast service and great price for a great product. I choose instead of fleetpride? now. They just have it all! Thanks 69182

- PK12907


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. 305601

- PK12907


Excellent folks with which to do business !! Great selection of quality trailer parts, good prices & quick service. Everything I needed to hookup to my Airstream trailer with a new solar panel. Very pleased !!!! 512021

- PK12907


I am pleased with product and will need more parts in the future from your catalog. Having delivery was big plus as the closest RV Parts & Repair dealer is now 50 miles away in Spokane ! Thank You. 491172

- PK12907


Ordered on Wednesday, delivered on Saturday. Good service and was kept well informed of order progress. Goods appear to be high quality although not yet in use. Would use this supplier again. 68938

- PK12907


Product matched what we were replacing. Costomer service Excellant . Email conformation on order awsome!! Delivery very fast. Has arrived and installed. Thanks!!!! 28574

- PK12907


I work in retail and my customer could not find this anywhere. Looked it up on your website and ordered it. Came to me fast and made my customer happy. Thanks!! 334851

- PK12907


As good or better than any other Plastic plug. I used it for a non typical application but I think its a good plug. 255395

- PK12907


heavy duty easy instrutions great product thanks for great comunicating & follow up will be buying more 39125

- PK12907


I needed a 9 pole plug and no one had it in my area. My order was shipped asap! Thank you very much! 210907

- PK12907


Product was just as described. And unbelievable shipping!!! It was shipped the same day I ordered... 157611

- PK12907


Everything as advertised, big bonus was it came sooner than advertised!!!! Love etrailer! 234241

- PK12907


Everything as advertised, big bonus was it came sooner than advertised!!!! Love etrailer! 234240

- PK12907


Quick shipment! Product was shipped quickly and was acuratley described. Perfect Fit! 4290

- PK12907


Good quality, terminals make solid contact for heavier amperage situations. 13281

- PK12907


Fast service and easy to order. Pictures are very helpful. 288735

- PK12907


Great Product. Exactly as described. Worked Great! 176491

- PK12907


Product worked great. Service was wonde rful 317976

- PK12907


Very good product and packed very good 160268

- PK12907


Arrived quick just what I needed 406605


Ask the Experts about this Pollak Wiring
Do you have a question about this Wiring?

  • 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...

  • 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...

  • Making a 7-Way to 9-Pole Trailer Adapter for a 1987 Avalon Trailer
  • What you can do is make an adapter to go from the 7-Way on your vehicle to the 9-Way used on the trailer. You will only need two parts and some wire. First, you will need a Pollak Black Plastic 7-Way, Trailer Side, # PK12706. Then you will need Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End, # PK12907. Both of these parts are designed so that you can attach the wires yourself. If you open up each one, you will see a number and function description next to each pin. All you will...
    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...

  • Installation of 7-way Trailer Connector on 2006 Nissan Titan
  • Yes, we have a kit, item # N40975 that will hook up to your existing wiring and provide a 7-way connector on your 2006 Nissan Titan. The kit includes the vehicle end 7-way trailer connector, relays and mounting bracket. You will have to install the relays under the hood in the passengers side fuse block (see video link). The port for the trailer wiring harness is located behind the rear bumper near the spare tire on the driver side.
    view full answer...

  • What Gauge Wires Should be Used with the Hopkins Connector part # HM48480
  • There really isn't a set maximum gauge wire that could be used on the Hopkins Connector part # HM48480. Most people will use 10 gauge wire as the max gauge for the brake output, 12 volt accessory, and ground wires. So you could easily use that gauge or slightly smaller or bigger without a problem.
    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...

  • What is Purpose of Reefer Tag/Stop Circuit on 9 Pin Trailer Wiring
  • The refrigerator or reefer tag line is the power feed for the thermostat that controls the cooling unit on a refrigerated trailer. It would connect to a 12-volt power source on the truck, if needed. If you are not pulling a refrigerated trailer, the circuit could be used for another purpose or just left unconnected if you do not need it. I have provided a wiring diagram for a 9-way connector that you might find helpful. If this circuit is not complete the refrigerator will not work.
    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...

  • 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 a Pollak Round 9-Pole Trailer Connector
  • You are looking for the Pollack 9-Pole, Round Pin Trailer Socket # PK12907. This is exactly what you described. Check out the review video I attached for this as well.
    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...

  • Needing a Replacement Mounting Bracket for a Pollak 7-Way Connector
  • The replacement mounting bracket for a Pollak 7-Way connector is # PK12711U. the bracket is the replacement bracket for Pollak products # PK11893, # PK12703, and # PK12907.
    view full answer...

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Info for this part was:

Photos by:
Theodore B
Expert Research:
Michael L
Expert Research:
Sarah L
Written by:
Tyler C
Expert Research:
Jameson C
Installed by:
Cole B

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