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Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - GM

Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - GM

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Tekonsha Accessories and Parts - 3025-S
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Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the junction box beneath your vehicle's dash. 1-833-496-1390 to order Tekonsha accessories and parts part number 3025-S or order online at Free expert support on all Tekonsha products. Great prices and Fastest Shipping for Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - GM. Accessories and Parts reviews from real customers.
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  • Reviews (15)
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  • Why etrailer?

Tekonsha Accessories and Parts

  • Trailer Brake Controller
  • Wiring Adapter
  • Wired to Brake Controller
  • Tekonsha
  • Vehicle Specific

Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the junction box beneath your vehicle's dash.


  • Pigtail wiring adapter eases installation of your electric trailer brake controller
  • Connector end plugs into the built-in port beneath the dash of your vehicle
  • Wire end connects to the wires on your brake controller with the included butt connectors
    • Compatible with time-delayed and proportional brake controllers from TrailerMate, Draw-Tite, and Tekonsha
  • Limited 1-year warranty

Installation of Tekonsha Brake Controller Adapter

To install your electric brake controller, you need to connect the wiring of the controller to your vehicle. Certain auto manufacturers offer pre-wired options, typically known as tow packages, wherein wiring is run for you from the dash to the trailer connector on the back of your vehicle. When this is done, a port is installed at your dash so that you can easily plug in a brake controller.

Installation 1Installation 2

This adapter plugs into the port that is built into the electric junction box beneath your vehicle's dash. The black box is located to the left of the steering column, just above the carpet. To plug in the adapter, first remove the cover on the box. The adapter plugs into the second slot from the left, on the top row.

To hook this adapter up to your trailer brake controller, just connect the 4 wires of the harness - ground, power, brake switch, and brake power - to the corresponding wires on the brake controller. If your brake controller came with a plug built into its wiring harness, you will have to cut off the plug and connect to the wires themselves.

3025-S Tekonsha Brake Control Pigtail Wiring Adapter - Single Plug - GM

Replaces Tow Ready 20263

Item # 3025-S

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - GM - 3025-S

Average Customer Rating:  4.9 out of 5 stars   (15 Customer Reviews)

Streamline the installation of your trailer brake controller with this custom adapter. Simply connect the wires of the harness to your brake controller and then plug the other end into the junction box beneath your vehicle's dash.


It made connecting my redit controler very easy.


I ordered this to install install a Redarc brake controller in my 2000 Silverado. Please note that this harness does not come with any plugs or adapters to fit the Redarc brake controller. You will need to also order the Redarc universal harness and splice the two together if you have an older vehicle not on Tedarc’s list.


great product


part delivered as promised very quickly and was correct.


Easy to install and affordable.


Awesome service, fast delivery. I would highly recommend etrailer. ??

2001 GMC Sierra

Great service, and product worked excellent ! I work order again.

working great. !
Gord - 05/31/2019


Excellent product packaged well with good instructions !

2002 Chevrolet Avalanche

What can I problems....the way everything should be.


Works great one year later

1999 GMC Sierra


2001 Chevrolet Silverado



Great product, worked perfectly



See what our Experts say about this Tekonsha Accessories and Parts

  • Do Wires On Brake Control Wiring # 3025-S Match Up Color To Color on a 2002 Chevrolet Avalanche
    To connect the Universal Brake Control Wiring Adapter, part # 3025-S, you would plug one end to the brake control port underneath the dash that should be located to the left of the steering column. The wire colors for this adapter will match up color for color to the wires coming out from the brake controller. The wire functions traditionally on a brake controller are as follows: Red Wire - Stop Light Switch Blue Wire - Trailer Feed, Power To Brakes Black wire - 12 volt power White Wire...
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  • What to Do if Something is Already Plugged Into Junction Box for Brake Controller on a 99-2006 Chevy
    When using brake controller wiring harness # 3025-S there should not be anything plugged into the junction box in the required location (top row, second from the left). It should look like the picture I have included. But the truck likely came with a factory adapter and that is what is plugged in. If the wires do not lead anywhere then that is what you have plugged in and it can just be removed or shoved out of the way.
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  • Can Brake Controller Wiring Harness from a 2001 Chevy Tahoe Fit a 2006 Chevy Silverado
    The wiring harness for the 2001 Chevy Tahoe, # 3025-S, is pinned out differently than the harness needed for the 2006 Chevy Tahoe. However, you can re-pin the 3025-S. With the blue locking tab on top, the white wire goes into the top left spot, the red goes in the bottom left spot. Black goes in center right and blue in bottom right. I have included a picture that should help.
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  • What are the Wiring and Color Codes for a Bully Trailer Brake Controller
    If you have a Bully TC-301 brake controller it should have the following wiring colors and codes: Black = ground Red = 12 volt power Blue = input from stop light switch Yellow = out to trailer brakes This is different than a connector like # 3025-S. On it the colors are black for 12 volt power, white for ground, blue for output to trailer brakes, and red for input to brake controller. But on a 1996 Chevy Suburban you will need to hardwire in the controller because there is no port or...
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  • Why Does Manual Override Lever of Brake Controller Illuminate Trailer Brake Lights
    Everything is most likely working just fine. Most modern brake controllers will put voltage on the brake signal circuit they are attached to when the override lever is applied so that your trailer brake lights would come on as you are applying braking power to the towing setup.
    view full answer...
  • Brake Controller Install Harness Recommendation for 2000 Chevy Silverado 2500
    The harness you need is the part # 3025-S. You will wire the harness by color to your controller and then will plug the brown connector into the junction box under the dash of your truck. I attached a help article on installing controllers in your generation truck for you to check out as well.
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  • Do the Wires on the Brake Control Wiring Adapter Match Up Color for Color with the Brake Controller
    Yes, the wires on the adapter, item # 3025-S, will match up, color for color, with the wires on your brake controller. If you have a proportional brake controller the brakes will not energize when setting still because the controller uses the forward momentum of the vehicle to energize the brakes with the appropriate amount of power to stop the trailer. The controller will need to be adjusted, after warming the brakes up a bit by starting and stopping a few times, using the directions...
    view full answer...
  • What Is Each Wire on the Universal Brake Control Wiring Adapter, item # 3025-S, Used For?
    The # 3025-S Universal wiring adapter is not the correct adapter for the 2003 Chevy Silverado 2500 HD. The connector will fit but You will need to remove the blue locking clip and switch the red wire from the top left, looking at the connector with the locking clip in the down position, to the bottom right connector terminal (opposite corner). To get the red wire out you will need to press on a very small locking tab on the connection side of the terminal. This is the only change that will...
    view full answer...
  • How to Wire a Bully Brake Controller to a 2003 Ford F-250 Using a Hopkins Wiring Harness
    As you have found out manufacturers make their own compatible plugs to match their own brake controllers. It looks like the Bully controller comes with a universal harness with blunt cut wires. You will need to cut the end off the Hopkins harness that plugs into the controller and wire it up as follows: Bully connector black to Hopkins harness white for ground Bully red to Hopkins black for 12 volt power in Bully blue to Hopkins red for stop light switch Bully yellow to Hopkins blue for...
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  • Brake Controller Wont Power Unless Brake Pedal is Pressed on 2000 GMC Sierra 1500
    Since your 2001 GMC Sierra came with a factory installed 7-way trailer connector, GM should have already completed the connections under the hood at the fuse box. However, we have found that GM did not complete the wiring on all trucks, even if they came with the factory trailer wiring. If you plug in your brake controller using a plug-in style wiring harness, like part # 3025-S, and the brake controller does not power on then the wiring under the hood must be completed. I would also take...
    view full answer...
  • Tekosha Electric Brake Control Wiring Harness for a 2001 Chevy Silverado 2500HD
    Your 2001 Chevy Silverado 2500 has a port that you can plug a brake controller into. It is under the dash, driver's side, near the back of the floorboard (forward on the vehicle). You would need wiring harness # 3025-P to plug in a Tekonsha brake controller. Or, if your controller doesn't have a plug on the back of it you would use # 3025-S and wire it up color for color to the back of the controller. There may be some additional connections that will need to be made under the hood to...
    view full answer...
  • Troubleshooting Brake Controller on 2002 GMC Sierra 2500 HD
    First, use a circuit tester like part # 40376 on the black wire exiting the rear of the controller to verify that power is reaching it. If not, there is a 20 or 30 amp fuse in the power distribution box, located under the hood on the drivers side fender, that is most likely blown. Once the fuse is replaced, you will want to inspect the brake output circuit on the trailer connector, tracing it back to the trailer brake magnets to determine what caused the fuse to let go. Skipping this step...
    view full answer...
    Image 1 for
  • How to Wire the Voyager Brake Controller to the Factory Wiring Harness on a 2001 Chevrolet Truck
    The wires on the OEM connector that was supplied with your 2001 Chevy Silverado should be marked for function, if not, I believe I can help. Your pickup will use the Universal Brake Control Wiring Adapter, item # 3025-S, and the wires for the brake controller will be in the same location on your OEM connector. With the OEM connector positioned with the locking tab up and facing away from you, the wires you need to connect to will be as follows. The blue wire should be connected to the...
    view full answer...
  • Installing Brake Controller with Bare Wires on a 1999 Chevy Silverado with Pig Tail that has Plugs
    On the brake controller wiring harness that you have you will need to cut off the connector from the end that would normally plug into a brake controller and then splice the wires from it to the wires on the brake controller. White is ground, black is 12 volt power, red is input from the brake switch, and blue is output to the trailer brakes. There is a harness that is already made like this. One end plugs into the port on your 1999 Chevy Silverado and the other end just has the bare wires....
    view full answer...
  • Can Brake Controller Wiring Harness from 2001 Chevy Tahoe be Used in 2007 GMC Sierra Classic
    The 2007 GMC Sierra Classic uses the same brake controller wiring harness as the 2006 GMC Sierra, # 3015-P for a Tekonsha brake controller. The 2001 Chevy Tahoe uses a different harness, # 3025-P or # 3025-S. What you can do if you do not want to buy a new harness is move the wire locations on the end of the connector you have at the end that plugs into the vehicle. It should be configured like the picture I have included for your 2007 GMC Sierra Classic.
    view full answer...
    Image 1 for
  • Installation of a Brake Controller for a 1999 Chevrolet 3500 Pickup Using the Fuse Box
    Yes, even if you didn't have a factory installed 7-way you will want to hardwire the open wires of the brake control adapter to the wires on the brake controller and plug the other end of the adapter into the electrical junction box. We have a specific Help Article on how to do this and make all the proper connections for this to function properly for your 1999 Chevrolet 3500 that I've attached to this page for you to reference. The brake controllers that I really like and recommend are...
    view full answer...
  • Installation of Brake Controller on a 2000 Chevrolet Suburban 1500 Series
    You can install any brake controller on your 2000 Suburban, with factory 7-way connector, by using the Universal Brake Control Wiring Adapter 1999-02 Chevrolet, GMC, Cadillac, item # 3025-S. I would recommend the Tekonsha Prodigy P2, item # 90885 and adapter # 3025-P, one of our best selling brake controllers. If your 7-way connector was not factory installed then you may need the Replacement Multi-Tow 7-Way and 4-Way Trailer Connectors for Ford, GM Trucks with Factory 7 Way, item #...
    view full answer...
  • Troubleshooting Prodigy P2 Brake Controller Installed in a 2001 Chevrolet Suburban
    Since the brakes work when you use the manual override, the first place that I would check is the fuses on your 2011 Chevy Suburban. I recommend starting with the fuse box under the hood and make sure that the fuse labeled CHMSL is good. CHMSL stands for Center High Mount Stop Light, the light at the top of the rear hatch of your Suburban. Since it is triggered with the brake lights this might be causing the issue you have with the Prodigy P2 brake controller. The next place to check...
    view full answer...
  • Are the Under Hood Wires Connected for Brake Controller Installation on a 2002 GMC Sierra
    If your 2002 GMC Sierra has the factory 7-Way tow package wiring installed on it then the under hood wiring is most likely connected to the studs that are found at the power distribution box. If your truck does not have the factory 7-Way tow package wiring, then you will need to connect the wires under the hood. We have a detailed article that shows where to connect the under hood wires, see link, and explains where to attach the brake controller output wire and 12 volt power lead for...
    view full answer...
  • Brake Controller Wiring Adapter for a 1999 Chevy Suburban
    I am sorry, but the Universal Brake Control Wiring Adapter 1999-02 Chevrolet, GMC, Cadillac, item # 3025-S, is only for the 2000-2002 Chevy Suburban with a New Body Style. It does not fit the 1999 Suburban. I just checked for you, and we do not have a custom brake controller adapter for the 1999 Suburban, which leads me to believe there is not a port available for the brake controller under your dash. Some models do have the brake (blue) and hot lead (orange or red) wires already ran...
    view full answer...
  • Brake Controller Installation Details and Running Wires on a 2002 GMC 2500 Pickup
    The best practice for running wires through the firewall on your 2002 GMC 2500 HD pickup, is to find an existing opening that has a grommet and use that. You'll also want to make sure that you keep the wiring well away from any moving or hot parts. In the absence of an existing opening, you might have to drill to make your own. In that case, make sure you are aware of what is behind the spot where you plan to drill, so you don't drill through anything important. You will need to use a...
    view full answer...
  • Recommended Brake Controller For Pulling a Coachman Catalina Light Trailer with a 2002 Chevy Tahoe
    Tekonsha Voyager brake controller # 39510 would be a good choice for your 2002 Chevrolet Tahoe. Your vehicle is wired with a plug for a brake controller, so you would also need brake control wiring adapter # 3025-S to make the installation as easy as possible. The 4 wires from the wiring adapter would simply be connected, using butt connectors, to the 4 matching wires coming out the back side of the Voyager brake controller. If your Tahoe did not come with a 7-way plug from the factory,...
    view full answer...
  • Brake Controller Installation on a 2002 GMC Sierra Pickup, Possible Wire Colors and Functions
    You might have a port on your truck, driver side, to the left of the emergency brake pedal in a power distribution box. If so, you can just plug in wiring adapter # 3025-S and match the colors on the other end to the brake controller. To complete installation and to activate the tow package (if it has not been done already) there are some connections that need to be made under the hood. I have included an FAQ explaining the process below. Wire colors are not an exact science, even on vehicles...
    view full answer...
  • How To Wire Hopkins Agility Brake Controller 47295 to a 2000 Chevrolet Silverado Z71
    If you have the brake controller port and the OEM supplied brake control harness that plugs into the port and has 5 loose wires, you will only need 4 of these wires. The brown wire is an illumination circuit. Some older brake controllers used a separate circuit to light the controller display, but it is not needed any longer. The colors you listed are standard GM/Chevy and match as follows: Truck Controller Red Black Light Blue Red Black White Dark Blue...
    view full answer...

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