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

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

Item # 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 's dash. Call 800-298-8924 to order Tekonsha accessories and parts part number 3025-S or order online at etrailer.com. Free expert support on all Tekonsha products. Guaranteed Lowest Price 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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  • Q & A (45)
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2002 GMC Sierra - Tekonsha Custom Wiring Adapter for Trailer Brake Controllers - Pigtail - GM

  • Trailer Brake Controller
  • Wiring Adapter
  • Tekonsha
  • Wired to Brake Controller
  • 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 '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

California residents: click here

Customer Reviews

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

Average Customer Rating:  5.0 out of 5 stars   (6 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.

- 3025-S

Works great one year later 848779

- 3025-S

Great product, worked perfectly 573062

- 3025-S
2001 GMC Sierra

Great service, and product worked excellent ! I work order again. 514227

working great. !
Gord - 05/31/2019


- 3025-S
2002 Chevrolet Avalanche

What can I say...no problems....the way everything should be. 430393

- 3025-S
2001 Chevrolet Silverado

Good 367758

- 3025-S

Awesome service, fast delivery. I would highly recommend etrailer. ?? 243242


Ask the Experts about this Tekonsha Accessories and Parts

  • 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...
  • Brake Controller Does Not Power On After Installation on a 2002 GMC Sierra
    It does sound like you have everything hooked up properly and all of the connections under the hood are there so the only other things I can think of are a blown fuse (the green one) or a break in the wiring from that positive post on the fuse box to the brake controller. If the post does not have power as you have indicated then its connection to the battery must be broken. You can bypass it by connecting the power wire to the positive battery terminal via a 30 amp circuit breaker such...
    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 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...
    view full answer...
  • 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.
    view full answer...
  • Connection of Blue Trailer Brake Control Wire on a 2001 Chevy Silverado.
    The blue wire is the brake feed wire for the trailer brakes. When you plug in the adapter, item # 3025-S if you need one, the wire is attached to the blue wire on the adapter which is connected to the blue wire on the brake controller. From under the hood the blue wire with the connector that needs to be cut off is ran to the 6-Way or 7-Way connector at the rear of the vehicle and attached to the brake circuit in the connector. If you use the Brake Controller 7 & 4 Way Installation...
    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.
    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 Brake Controller on a 1999 Chevy Suburban K1500
    Your 1999 Chevrolet Suburban will need to be hard wired for installation of a brake controller. The Suburban did not get the wiring update that the pickup did until the 2000 model year, so the Universal Brake Control Wiring Adapter, item # 3025-S, will not work on your Suburban. You will need to splice the red wire from the back of the brake controller to the wire at the back of the brake pedal switch that carries power only when the brake pedal is pressed. You will also need to wire...
    view full answer...
  • 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...
  • Troubleshooting a Reliance Brake Controller That is not Operating Correctly
    It sounds like the brake light switch wire coming out of the brake controller may be wired into the wrong circuit. If you have the older C/K body style with the square shaped front body, then you will need to double check that you have the red wire connected to the brake light switch wire. The wire on the brake switch that needs to be connected should be a light blue wire according to the installation instructions for the Reliance controller. You can use a tester, like # 40376, to...
    view full answer...
  • 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.
    view full answer...
  • Do Wire Colors on Hayes Brake Controller Match Wiring Harness 20263 for 2000 Chevy Silverado
    Yes, the colors on the harness # 3025-S and those on the brake controller, HA81745, will match up. White is ground, black is 12 volt power, red is input from the brake switch, and blue is output to the trailer brakes. To complete installation, there may be some additional connections you will need to make under the hood. I have included a link to an FAQ article explaining these under hood connections. But for a Hayes controller you will want to use the matching Hayes harness for the...
    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...
  • 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...
    view full answer...
  • Installation of Tekonsha Voyager in a 2001 Chevrolet Suburban 1500
    It sounds to me as if you have a aftermarket 7-Way and 4-Way trailer connector installed on your vehicle. The Replacement Multi-Tow 7-Way and 4-Way Trailer Connectors for Ford, GM Trucks, item # 30955, should be attached to the factory connector under the vehicle near the spare tire see link. This connection should provide all of the wiring to your trailer connector from the front of the vehicle, except for the blue brake feed wire if the connector is not factory installed. The brake...
    view full answer...
  • 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...
    view full answer...
  • 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...
    view full answer...
  • Wiring a Trailer Brake Controller With or Without Factory 7-Way on a 2000 Chevy Tahoe
    Your 2000 Chevy Tahoe will have a port for brake controller wiring adapter, # 3025-S. You will want to look in the electrical junction box on the drivers side, left of the brake pedal under the dash. I have included an FAQ on installing a brake controller on Chevy and GM pickups that will also apply to your Tahoe. The first two pictures show the box you are looking for and where it and the connection point for the adapter is located. Some models have a factory 7-Way pre-wired through the...
    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...
  • Parts Needed to Install Trailer Brake Controller on 1997 Chevy C/K Truck w/4-Way and 7-Way Adapter
    For a 1997 Chevy C/K Series truck you will have to hardwire in a brake controller since that year did not come with the wiring or a port to plug in a controller. Since you already have a 4-Way and the adapter you will only need a few more things. You will need a brake controller installation kit like # 5506 (if it has 6 to 8 brakes). You will also need a 40 amp circuit breaker # PK54540 (for the 12 volt power to the 7-Way. If not needed you can tape up this wire and the circuit breaker...
    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...
    view full answer...
  • 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...
  • 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...
    view full answer...
  • Recommended Wiring and Mount for Redarc Liberty Trailer Brake Controller on 2002 GMC 1500
    The Toyota 4 Runner had a knock-out plug already present and then we simply added the Universal Mounting Panel for Redarc Tow-Pro Trailer Brake Controller Control Knob # 331-TPSI-001 which measures 1-1/4 by 1 inch. There is also the option of using the Mounting Panel for Redarc Tow-Pro Trailer Brake Controller Control Knob # 331-TPSI-002 for the more standard knock-out measuring 1-1/4 by 7/8 inch. These are made by Redarc which is based in Australia. These options give a more finished...
    view full answer...
  • Wiring a Brake Controller on a 1995 Chevrolet Silverado 2500 LS
    Yes, you will be able to install the Draw-Tite Activator IV Brake Controller, item # 5504, on your 1995 Chevrolet 2500 Silverado LS. You will not need the Universal Brake Control Wiring Adapter 1999-02 Chevrolet, GMC, Cadillac, item # 3025-S, on the 1995 model because there is no factory port under the dash to plug the adapter in to. Chevrolet did not start putting the brake controller wiring port under the dash until 1999 so you will need to hard wire the brake controller on your 1995...
    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...
  • Wiring Pattern for a 7-Way RV Trailer Connector on a 2001 Chevrolet Silverado Without Factory Wiring
    To install a 7-Way wiring connector at the rear of your 2001 Chevrolet Silverado without a factory 7-Way or a factory 4-Way connector, I recommend using the 7-Pole and 4-Pole Trailer Connector Socket and wiring harness, # HM40975-11998. You can the wire most of the circuits needed to the wiring harness that is located above the spare tire along the driver side frame rail. The wiring above the spare has a yellow wire for the left turn and brakes, dark green wire for the right turn and...
    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...
    view full answer...

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Info for this part was:

Expert Research:
Jackie C
Expert Research:
Michael H
Expert Research:
Jameson C
Edited by:
Lindsey S
Updated by:
Laura H
Written by:
Alexander C

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