Product Experts Available Now!
Call 1-800-940-8924
Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End
(54 reviews)
Price: $20.28
In Stock
We'll connect you with nearby partnered installers who know this exact setup.
Pollak 9-Pole, Round Pin Trailer Socket - Vehicle End
Part Number: PK12907
In Stock
$20.28
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
We'll connect you with nearby partnered installers who know this exact setup.
- All Info
- Reviews (54)
- Q & A (0)
- Photos
Pollak Custom Fit Vehicle Wiring - PK12907
Highlights
- Expand Trailer Functions: 9-pole socket supports brakes, charge lines, and reefer or aux circuits.
- Custom Wiring Setup: Wire by function using color-coded gauge sizes for each circuit.
- Reliable Power Delivery: Heavy-duty pins handle 8- to 14-gauge wiring for steady connections.
- Seamless Pairing: Matches with Pollak 9-pole trailer connector #PK12906 for full vehicle-to-trailer link.
- Clean Mounting Option: Works with Pollak bracket #PK12711U for secure, professional install.
Features to know about
Handles Heavy-Duty Towing Needs: 9-Pole Round Pin Connection
When you need more than the basic trailer lighting, this 9-pole socket steps up. The Pollak 9-Pole, Round Pin Trailer Socket – Vehicle End gives you dedicated circuits for brakes, charging, running lights, backup power, and more. With nine pins to work with, it’s ready for setups that use auxiliary power or even refrigeration units.
Wire It Your Way: Flexible Circuit Functions and Wire Gauge Options
Every circuit has a recommended wire gauge so you can match it to your trailer’s electrical load. Use 8-gauge for ground and battery charge, 12-gauge for brakes and auxiliary circuits, and 14-gauge for lighting, signals, or reefer power. That layout makes wiring simple and reliable whether you’re setting up electric brakes or powering extra lights.
Pairs Perfectly with the Matching Trailer Plug
This socket is designed to work with the Pollak 9-Pole Trailer Connector # PK12906 on the trailer side. Together they create a solid connection that handles multi-circuit towing jobs without the guesswork. You wire each pin by function so both ends match exactly.
Easy Mounting with Compatible Bracket
For a clean install at the back of your vehicle, the Pollak # PK12711U mounting bracket fits this socket perfectly. It keeps the plug secure and easy to reach so you can connect and disconnect quickly when hitching up different trailers.
Specs
Wiring Specifications
- 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: Back-up, Auxiliary Ground or Circuit - 14 gauge
- Gray: Auxiliary Circuit - 12 gauge
- Orange: Reefer (tag) or Stop - 14 gauge
Compatible Mounting Bracket
- Mounting Bracket: Pollak # PK12711U (compatible with Pollak 9-Pole, part # PK12907)
Compatible Trailer Connector
- Trailer End Connector: Pollak 9-Pole, Round Pin Trailer Connector # PK12906
Additional Configuration Options
- Converter for Separate Brake Signal: Curt Vehicle to Vehicle Tail Light Converter # C56196
- 12V Power Circuit Components: Wire # 10-1-1 and Circuit Breaker # 9510
Circuit Information
- Reefer Tag Line: Power feed for thermostat controlling cooling unit on refrigerated trailer; connects to 12-volt power source on the truck if needed.
12-907 Pollak 9-Way, Round Pin Trailer Socket - Vehicle End
Customer Satisfaction Score:
99% were satisfied with this product
1% of customers were not satisfied
Ratings & Reviews
4.8
54 reviews
by:
David
05/21/2026
Amazing fast delivery when I need trailer parts I will definitely check with E trailer first
by:
Stuart
04/29/2026
Unfortunately, this is a budget receptacle
by:
TOM
03/06/2013
Fast service and great price for a great product. I choose etrailer.com instead of fleetpride? now. They just have it all! Thanks
by:
Andy
05/05/2026
Exactly what I ordered and needed for the special project.
Easy to find the product I need, reasonably priced and shipped promptly.
I would certainly recommend them
Easy to find the product I need, reasonably priced and shipped promptly.
I would certainly recommend them
by:
Jack S
04/26/2018
Awesome product! Used it for wiring on my farm tractor.
by:
Billy B
10/08/2016
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.
by:
Jonathan
03/25/2023
I was searching all over the Dallas/Fort Worth metroplex looking for a male 10 pin connector to mate to a 10 hole connector on a 1992 Holiday Rambler 5th wheel trailer. I spent two days going from RV stores, trailer businesses looking for the 10 pin connector. All the stores didn’t have the part or the weren’t interested in helping me. I finally ran into a gentleman who knew that a 10 pin connector existed but they didn’t have one. He directed me to etrailer and they had one. They shipped it to me and I got it in two days. Great service from sales to check out to shipping. Great Job!
by:
John
05/22/2018
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 !!!!
by:
Charley
03/31/2018
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.
Charley
3/31/2019
pleased, no problems
by:
John
10/23/2014
Product was just as described. And unbelievable shipping!!! It was shipped the same day I ordered...
by:
Jackie
12/08/2019
We needed to replace the input of the socket for our 25+ year old sno-way plow on our 1998 Chevy Blazer. The repair shop told us parts were no longer made for this unit. With a little investigation on the internet, lo and behold, there it is. Ordered, recieved and mounted, viola, it's working great! YAY!
by:
Thomas
10/09/2018
I posted a review for the female part am very pleased with both we used it for the electric controls on a chopper and they both worked out very well. Thanks again
by:
Dennis
03/02/2020
Fast shipping, good quality parts!
by:
Len
06/01/2016
As good or better than any other Plastic plug. I used it for a non typical application but I think its a good plug.
by:
Gerry F.
01/23/2017
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!!
by:
Rob F
12/25/2015
Everything as advertised, big bonus was it came sooner than advertised!!!!
Love etrailer!
Love etrailer!
by:
Rob F
12/25/2015
Everything as advertised, big bonus was it came sooner than advertised!!!!
Love etrailer!
Love etrailer!
by:
John
07/10/2015
I needed a 9 pole plug and no one had it in my area. My order was shipped asap! Thank you very much!
by:
Michael S.
03/05/2013
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.
by:
Montgomery
04/21/2022
great product
by:
Mike
05/10/2011
for heavier amperage situations.
by:
Alex N
08/28/2016
Fast service and easy to order. Pictures are very helpful.
by:
chris bruton
05/02/2012
thanks for great comunicating & follow up will be buying more
by:
E.J.
11/18/2016
Product worked great. Service was wonderful
by:
Steve Tirpak
11/10/2014
Very good product and packed very good
25
54
true
Show More Reviews
See what our Experts say about this Pollak Custom Fit Vehicle Wiring
- The Best Way to Wire a 9-Way Vehicle Connector to a Trailer Side 9-Way ConnectorThe 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... - Wiring 2001 Ford Ranger to Tow a Trailer with a 7-Way Blade, 7-Way Round, or 9-Way Round Connector9-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... - What is Purpose of Reefer Tag/Stop Circuit on 9 Pin Trailer WiringThe 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 ThroughI 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... - Installation of 7-way Trailer Connector on 2006 Nissan TitanYes, 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... - Convert a 7-Way Connector to a 9-Way Trailer Connector for a 1985 Fireball Travel TrailerWe 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... - Identifying Wiring on 1997 GMC SafariYou have already identified six of the functions on your 7-way, 1) Tail/Running Lights 2) Left Turn/Stop 3) Right Turn/Stop 4) Reverse 5) Brake Controller Output 6) 12V power. The only wires not identified were the ground wire - which make sense if you were testing it with a circuit tester because it would not have an identifiable function - and the other is likely the third brake light wire. If you take a look at the diagram I added you can see the standard pin functions of a vehicle-side...
view full answer...
- Availability of Wiring Adapter to Convert 7-Way RV Connector to 9-Pole Round Pin on 1984 Jayco9-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... - Making a 7-Way to 9-Pole Trailer Adapter for a 1987 Avalon TrailerWhat 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... - Upgrading a 2010-2016 Ford Super Duty to 9-Pin Wiring With Separate Center Brake Light PinWhen 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... - 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 Recoil Wiring for 9-Way Pollak Connector PK12907We 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... - What Gauge Wires Should be Used with the Hopkins Connector part # HM48480There 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... - Mounting Bracket Fit for Pollak PK12907 9-Pole Trailer ConnectorThe Pollak # PK12711U mounting bracket is indeed compatible with the Pollak 9-Pole, part # PK12907.
view full answer... - Availability of a Pollak Round 9-Pole Trailer ConnectorYou 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... - 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...
Do you have a question about this Custom Fit Vehicle Wiring?
Info for this part was:
Expert Research:
Mike L
Expert Research:
Sarah L
Expert Research:
Jameson C
Written by:
Tyler C
Video Edited:
Dustin K
Installed by:
Cole B
Updated by:
Isabelle B
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Jack S.
4/28/2019
Excellent!