Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.
Part Numbers: 3040-P
Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.
This adapter plugs into the 5-pin connector on your vehicle's built-in brake control wiring harness. The harness is located underneath the dash, to the left of the steering column, taped to another harness near the emergency brake pedal.
To install your electric brake controller you need to connect the wiring of the controller to your vehicle. Certain manufacturers offer pre-wired options, typically known as tow packages, wherein these wires are run for you from the dash to the trailer connector on the back of your vehicle. Often, a brake controller wiring harness is included with your tow package. This harness plugs into a port beneath your dash and connects to the four wires of the brake controller. If, however, you have a brake controller with a plug in place of the four loose wires, you can use the Tekonsha adapter.
This adapter requires no hardwiring. It is designed to plug directly into your electric brake controller for the simplest installation possible. Because there are no wires to connect, installation is not permanent. You can unplug and remove your brake controller at any time and securely stow it away.
Video of Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers - Toyota and Lexus
Videos are provided As a guide only. Refer To manufacturer
installation instructions And specs For complete information.
Today we're going to review part number 3040-P. This is the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers. This is a custom fit part number. It is designed to fit Lexus and Toyota vehicles starting in 2003. Because it fits a wide range of vehicles, I would recommend to go to our website, use our fit guide. Put in your year and model Lexus or Toyota vehicle and it will show you if this will work for your application. This wiring adapter will help ease installation of your electric brake controller.
On this end right here with the white plug, that's a custom connector end. This will plug into the built-in factory brake controller port on your vehicle, usually beneath the dash of your vehicle. The other end right here you can see, has the flat black connector. This is designed to plug into the back of your electric brake controller. This is designed to fit.
It is compatible with time-delayed brake controllers by Draw-Tite. It is also compatible with proportional brake controllers like the Tekonsha Prodigy, Prodigy P2, Prodigy P3, the Primus IQ and the Voyager. Also if you'll notice, it has an extra length of white wire on here with a eyelet on the end. This is for a ground so what you need to do is after they're plugged in you still need to make sure you connect this to a good clean ground for it to operate correctly. The length of this harness is about 32 inches long. What I want to show you right now is I have an example here is a Prodigy P3 brake controller.
We do sell those separately on our website. If you notice on the back there is a plug in. You take the black part, plug it in. You hear it snap and clip into place right there, locks into place. Again, make sure when you do plug that in, take your white wire and you do attach that to a good clean ground. On the other end you'll see this white custom connector.
This you'll just locate the built-in factory brake controller port on your vehicle. Like I said, they're usually under the dash. Locate the connector that'll match up to that, plug it in. With this ground and this plugged in, you're all ready to go. To remove it, just pull up on that clip and pull it right out, just like that. That should do it for the review, part number 3040-P, the Tekonsha Plug-In Wiring Adapter for Electric Brake Controllers. .
Average Customer Rating: 4.9 out of 5 stars (492 Customer Reviews)Install your electric brake controller quickly and easily with this custom wiring adapter. Simply plug one end of the adapter into your brake controller and then plug the other end into the built-in harness beneath your vehicle's dash.
by: Robert F.07/08/2015
Easy to install. Owners manual had location of factory plug and we installed the entire system in less than an hour. We used the removable bracket so the unit can be stored in the case that was included with the controller when not towing so it is completely out of the way of the drivers legs and knees. We are a collision repair shop and I would rate the ease of installation as relatively easy if you just use common sense and consider wiring location and controller location BEFORE drilling holes in the plastic lower dash cover. Also need to be mindful on the lower air bag that protects the drivers legs in a serious collision and the routing of the wires if you install it on the right side of the steering wheel. We used wire ties and a small plastic wire holder to place the wiring in a secure place that does not rub through the wire insulation or get snagged by the drivers feet. See the attached photos. All work was performed in slightly less than one hour. 210331
by: Chris M08/20/2013
Installed P3 this weekend in 2013 Tundra Crewmax with towing package and pre-wire. Extremely easy, even with the center console installation. Will let the photos tell the story. Did have to combine the P3 included harness with the additional OEM harness to gain the length I needed. Plug and play with the pre-wire. Hooked up to trailer and set boost levels for varying loads. Works great! Vast improvement over older model Tekonsha controller in my Ram 2500 Diesel. Pull a Kiefer BP horse trailer: about 3600 lbs empty, 7500 with 3 quarter horses and gear. Usually pull 6-8 times per year, with only 1-2 horses. Short distance and flat terrain. It took about an hour to install. Dad is a retired USAF/FAA radar technician with every tool known to man. He QC'd the job. Will try to write better review later. 96004
by: TIm S07/25/2013
This is the first brake controller I have ever bought. I just brought home a new Toyota Tundra and a travel trailer. I didn't have the opportunity to have the dealer install a brake controller so I called ETrailer and had them ship me one next day. The controller is great. I hooked it up and mounted it on the left side of my dash. Plugged right in to my factory prewire. The only issue was I had to find a place to ground the unit, but I was able to do that by removing a panel by the emergency brake and attaching to a ground there. The installation was simple and easy. I setup the controller from the manual - which is easy to ready and well written. I did the test runs as indicated in the manual and what I gleaned from other sources and the trailer brake controller works exactly as it should. There are more features on this controller than I probably need, but it looks great and works exactly as described. I am very satisfied with the purchase. 91459
I've never hooked up a trailer break controller before, but the videos that etrailer provides gave me confidence; detailed video and exact step-by-step instructions. Kudo's. One point I'd like to make - not sure why the ground lead was not included in the pigtail. Perhaps they found that some OEM connectors were missing this lead. But since it wasn't, I had to open and pry the terminal to fit the only available bolt which slowed down the installation job, but I got there. Might recommend the pig-tail maker to use a bigger terminal ring. (white wire) I've still not actually used the product, but it appears to function as advertised. I won't be hauling until spring (Mar/Apr, depending on weather), but I'm ready. Again - great instructions from etrailer which ultimately lead me to purchase this product. 66935
by: Dave L.08/21/2014
The cable is well made and installs quickly. The only thing that would have made it better is making it about a foot longer. Its current length limits mounting the P3 to the left of the steering column. 147951
Pictures of the install. Approximately a 20 min job. First picture my finger is pointing to the factory plug with the etrailer supplied harness plugged in. Note the harness did not specify that the white common with the ring terminal should be connected to ground. But then again that SHOULD be obvious. I will be towing this weekend so I will rate the product then. One minor gripe is that there is always power to the unit which is a battery drain (as evidenced with the key out of the ignition and the unit stayed on) Not sure as to the impact but the controller can always be unplugged or removed. Sorry for the dirty floor mats in the photos. 115202
by: Craig Y12/03/2012
Purchased Adapter along with controller. Could not be more pleased. Was under a time crunch, new truck + next day horse show = quick install and dial in. The process went flawless - 15 minutes to install and be operational and then 10-15 minutes to setup the way I wanted and dial it in for both the empty trailer and full trailer. The Adapter went along way to this simple instllation. 60489
It would be easy to have this part order and install on the Tundra. i went one step further and end up using the wiring in the box with P3 Trailer brake and had to splice the wiring to make longer extension in order to install the P3 in the empty slot between the lighter and 12v socket which make is more customized look and out of way. Would be cool if they offer longer version for someone who want to install it somewhere else behind the driver's spot zone. 281088
by: Forrest K.10/25/2013
High quality wiring and connectors. Excellent fit, perfect length. Controller installed earlier, forgot to order harness. Harness took about 20 minutes to connect up, including removing lower dash panel and replacing. 105170
by: Chuck Moneypenny02/17/2014
The item was received quicker than expected and was exactly as described. Our new trailer is not due to arrive until mid March, so I can't provide any feedback yet on its operation or performance. 116688
by: Philip C.05/30/2015
They led me to the correct wiring harness that had the correct plug to fit other end that came with the truck. Telephone support helped me figure out that controller being removed from old truck into the new truck had it's original connector plug removed and was spliced into the harness that fit the old truck. So I did the same and cut the plug that would go to the controller and spliced the new harness to the old controller. Works fine. Thanks for the help. 198899
We ordered a part for the 2008 Land Cruiser and was told that it's the same installation. IT IS NOT! The connection to the harness is not in the same location as Tacoma. After looking for more than an hour, I got smart and found some info on another website. Even the manufacture has the info wrong. So, if you have a 200 series Land Cruiser, your plug is located under the dash behind the switches for the mirror. You will need to take apart the lower dash panel and then push out the switch panel. There is no need to detach any switch, it all hangs out just fine. See photos for the location of the plug. Plug the adapter in from there you can follow the instructions. 99168
Harness I purchased made my install so simple and quick anyone could have done it. plugs into my controller, plugs into my trucks existing wiring harness connect a ground wire and you are done take mire seconds, worth every penny. 76567
Though I had to splice to P2 harness for sufficient length from vehicle plug-in to P2 install location the harness could not have made the connection simpler. 90716
by: Mark N06/05/2014
Install is very easy once you locate the vehicle's brake controller plug. The plug in a Tacoma is extremely well hidden. It is high above the driver's side kick panel taped behind a plug wrapped in foam. I have attached a photo to help you locate it in a late model Tacoma. Once I found the plug, the install took less than 20 min. The controller works great. 134425
by: Ken M.09/22/2014
I purchased a Tekonshia brake controller for my 2013 Tundra, part number 90195. I also purchased the wiring harness part number 37185. My pickup has the plug pre wired on the Tundra. It can be found under the side kickplate of driver side under the dash. Its located up high. The harness can reach if you put in under the front edge of the dash. I located the brade controller to the right of the steering wheel on the bottom of the dash. You will need to make two small wholes for the bracket. Install the small bracket and then the larger one. if not you will have trouble installing the screws to the dash. Then install the large piece and next slide the brake controller in the large bracket. I set the brake for my trailer and changed the color to match the orange color of my dash lights. . Its not too bright with the orange color. The blue is pretty bright. I tow a 5,000 pound trailer and it works well. I would recommend this brake controller with the wiring harness to other truck owners. I recieved the brake in three business days. 152387
by: Rob B.07/09/2011
Bought this as a simple way to wire in my Prodigy controller to a Tundra. I had purchased one of these for my Silverado and liked the idea so much I got the harness for my new truck. A new truck typically comes with a harness pigtail with a connector on one end and wires on the other to connect. You have to cut, strip, and make sure the correct wires are being used in the correct places on your controller and yes basic directions were included from Toyota. However, I opened the package, cut a zip tie, and will end up plugging this on both ends and be done and it looks better than that factory pigtail from Toyota. It is based on your vehicle model so lengths seem to vary and pricing is satisfactory. This is designed to save you time, frustration, and it looks clean opposed to that mess of crimped connectors, solder, or electrical tape you might attempt to use. Sure you can make yours look this good, but I know you can't do it for what I paid and have it look as good as a factory install. Its great for a no fuss install. 18979
by: Mike A.04/12/2015
Bridget was very courteous and answered all of my questions. Product arrived extremely quick. Free shipping was nice. Installation with Toyota Adaptor was extremely easy. Hardest part was adjusting controller. I haven't used controller enough to write a thorough review but it seems to work fine. I do like the features and settings on the P2 extremely well. 184836
by: Moto Mac05/26/2013
This brake controller was received less than 3 days after it was ordered. Fast service! It looks good, the instructions are easy to follow, and I'm sure it will be as good as all the other Tekonsha models. One complaint though.....the wiring adapter is just too short! When plugged into the Toyota wiring harness, the short length of the wiring only allows installation along the bottom of the dashboard, to the left or right of the airbag below the steering wheel. When mounted on the left side, it is very awkward to squeeze my foot between the rear of the controller and the parking brake. When it is mounted on the right side, my knee hits it every time I move my foot from the throttle to the brake. Neither on of these locations are acceptable. I will have to add 12 inches of in-line extensions to the wiring so it can be located in an available opening on the lower center of the dashboard below the A/C controls. This should have been taken care of at the factory, not by the customer. 81997
My package from you guys arrived Friday night, and I installed my brake controller on Saturday using both the 3040-P harness and the harness that comes with the unit. I connected the 3040-P pigtail to the factory connector and run it as far toward the passenger side as it would reach then cut the end off that plugs into the P3 as I needed more length. At this point I went to the storage area that I mounted the P3 in and drilled a hole just big enough for the 4 wires that come out of the P3 harness. At this end I used the P3 harness that came with the controller...fished it thru the little hole and connected about where the little pocket is on the right hand side of the steering wheel. I have yet to pull my trailer with it connected....hopefully this weekend, but at least it looks good! 84298
The brake controller was super easy to hook up. The video etrailer and other You Tubers have shows exactly how to hook it up. Very happy! I will be coming back for more stuff for my truck! 208961
by: Gail B06/16/2015
I placed my order with Keigan B. at e-trailer. He verified that I was asking for the right part number. Told me when it would arrive, that shipping was free, and then che3cked to see that it had arrived as promised. Rarely do you get that kind of service. Additionally the trailer brake module was easy to install and it works very well. 203851
by: Joe C.01/29/2014
Just what I needed. This, and the foresight of Toyota to provide a plug-in, made installing a brake controller a breeze. Great videos on their website. 115145
by: Chris M.03/12/2014
Product was easy to install between my 2004 Sequoia and Primus IQ controller. Only complaint is that the white ground wire could have been a few inches longer than the rest of the cable to allow attachment to my vehicle grounding point, which was a short distance away from the vehicle connector plug. 120409
Primus IQ brake controller and the Tacoma 3040-P cable were installed on my 2010 Toyota Tacoma. I installed the controller directly under my steering column. The Tacoma towing package connector was in the exact location as per the etrailer.com instruction video. Had to drill one small hole in the sheet metal and 4 wire ties later the controller was up and running. Total installation time: 20 min. 185611
by: jerry S07/10/2013
Received and installed the wiring adapter for the electric brakes controller on my Tacoma, it was very easy and works great. Recommend the product. 88777
by: Dennis L.05/23/2014
This has to be one of the easiest hookups I have ever done. Called dealer, he told me where the wire plug was. Look at a video installation of my truck. All work done in an hour. 2014 Toyota tundra. And it works 132171
Plug is a little short to mount in cubby of a Tundra, but a easy splice with only 4 wires. Fast and easy order, quick shipment. Installs as advertized with great customer service and competitive pricing. 63149
by: Eddie C03/10/2014
I bought a new trailer and wanted to go camping. I did not have a brake controller. I called around and to get a Prodigy P2 installed it would be a 2 hour drive to the dealership plus about $200 bucks for parts and another $115 for an hour of labor. I found this website, got the prodigy P3 plus 2 day shipping and installed it with their super simple video in 15 minutes all for less than $200. I was very pleased to say the least. I highly recommend them. Service was outstanding! Video instructions spot on and simple. 120012
by: David C.05/08/2015
Install went without a hitch (ha-ha). I don't have a trailer with electric brakes yet but I'm sure it will work great. 191510
by: Jesse P06/03/2012
Great item, plug and play, the only way to go. Installed my brake controller in 20 minutes. 42561
This specialized wiring harness makes it child's play to install a brake controller in my Toyota 4Runner. 134991
by: Marty H03/17/2015
Bought the Prodigy P2 brake controller. Don't know if there is an off switch, or just a sleep mode (Power switch doesn't have a click position and instructions didn't mention it). Haven't hooked to a trailer yet. The Toyota attach cord was so unreachable, that we took it to the dealer and they installed it where we wanted. They said they had to take off three panels to get to the pre-wired plug. That said, hope to use the unit within the next few weeks. 179169
This cable is so short that mounting locations are limited to the areas under the steering wheel. I find it hard to see under there and hoped to place it in the recess in the center console where my wife and I could both monitor it. But it's not even close to long enough to reach there. I thought I'd just use the wiring harness included with the controller and the connector that came with my Tacoma and return this connector. But e-trailer's return policy meant I would have paid more to return it than it cost in the 1st place. And, they were totally unwilling to work with me on alternatives. So, i'll put it up for sale. Anybody want one??? 80552
by: Dale V04/08/2011
No hassle hookup. etrailer was awesome, they shipped my P3 and this connector immediately and provided great tracking. They also followed up afterward. Excellent customer service!!! Real customer service is hard to find these days. Thanks etrailer!!! I haven't towed my travel trailer yet but the controller is installed in my 2008 Tundra and looks great. Everything seems to be working as it should. I can't wait to try it out. Regards, Dale V. 11353
by: Walter Bennett04/29/2013
Just what they said easy install 78386
by: Chris E.08/29/2015
Easy to install. The cable is only barely long enough to mount the brake controller under the dash on the driver's side. To do so, I had to remove the plastic under dash skirt and fish the wire along the same path as some of the OEM wiring. The cable is not housed in plastic flexible conduit, and I was concerned about abrasion of the wire insulation and the dash skirt, so I had to buy some to protect the cable wires. The Tekonsha instructions available online do not show the correct under dash picture for the OEM hookup. I found it in my owner's manual and in the excellent etrailer installation videos. 222748
Easy plug in install on my 2013 Toyota Tundra. Easiest brake install I have ever had. 140259
by: John C.08/13/2012
This product works as advertised. I used it for my first voyage towing a decent sized trailer with my V8 4Runner and it controlled the brakes well. I think my truck, which has great brakes, stops better with the trailer attached then without! The only gripe I have is that before using the unit, you must adjust the power level to the point just below where the trailer wheels lock up. Even set on the highest setting, only once could I get the trailer brakes to lock up when the trailer was unloaded. So I set it to level 12 and boost level 1 for a 3200lb load and it worked great. 51533
by: R T06/28/2015
Great service, great product! I wanted a low profile tool box to fit in the bed of my 2015 Tacoma and the UWS box designed for the smaller ford ranger step side was perfect. Fits below the rails and over the wheel wells in a 5ft Tacoma bed. This is the 3rd item I have ordered from eTrailer in the past year, ALWAYS great service, quick delivery, and great support]. Thanks eTrailer! 207851
by: Andy D.06/18/2015
The Tek. Prodigy P2 controller & plug-in wiring adapter installed & worked as stated on E-Trailers web page , for my 2014 Tundra , with no problems . Going to the Rocky Mts. in 4 days I had to have dependable brakes . I spoke with Bill E. at 1:00 P.M. Monday & he made sure I received my order by 2:00 P.M. go with one day to goon Wednesday & I had it installed in about 45 min. After hooking-up to the trailer , I adjusted the controller per the instructions , about 10 min.,was ready to go , with one day to pack & load . THANKS E.Trailer for the great service ! Andy 204399
by: Rob P.05/17/2012
Well, as usual, eTrailer delivers on all accounts! Once again Janice was a Dear to deal with. She called me to inquire and make sure my technical questions were answered by Mike, and then was even nice enough to take my order right then and there. Ordered the pig tail to install the Tekonsha P3 I had previously bought from them for my old truck to install it in my new Toyota Tundra. Delivery took minimal time, and product was as listed, the perfect fit. I've said it before, you can't go wrong with eTrailer. Thank you Janice, Mike and eTrailer. I'll be back. Rob 40836
Went with the Tekonsha P2 controller. Super easy info and ordering from etrailer. Came quickly. Install with the vehicle specific harness was a snap. 2011 Toyota Tundra. 15 minutes probably. Plug and play. Controller works great! Only gripe would be the blue light from the display is a little bright ay night. So be mindful where your mount it. Or just put a piece of electrical tape on it when not it use like I did. Or use the clip holster to mount it and just remove the controller when not using it. I'm to lazy for that. Tape works great! ;) 160089
by: J. Galt10/14/2015
I got this with the Tekonsha Prodigy P2 for my Toyota Sequoia. Installation was incredibly simple: mount it, bolt down the ground wire, plug it in. Done. Be sure to check to see if there's an installation video for your vehicle. That helped me locate the factory connector very easily. And one more thing...my factory connector had an empty female connector attached to it for convenience. You won't need it, but this harness won't fit unless you remove the empty connector. And delivery was super fast! I'm very pleased. 229966
P3 install in 2013 Tundra SR5. Product received as ordered. The exact connectors, although the cable was barely long enough. Brake controller works well. Thank you. Very prompt delivery. Did not know there were etrailer instructions till I just read this. Video was somewhat helpful. A video for the P3 up higher on the dashwould have been helpful. The locations shown in the videos are too low to be able to see and easily reach the controller without taking your eyes off of the mirrors and load. 71619
by: Rod T.10/31/2013
Works great. Allows a Tekonsha brake controller to hook up to a Tacoma built-in wiring harness without splicing any wires. The most difficult part of the installation was actually finding the wiring harness receptacle on the Tacoma. Both the Tacoma owners manual and the instructions for this product show the general area of that receptacle. However, you can't actually see it as it is located behind a large wiring harness. After quite a while probing around in a very tight area, I finally found it. 105890
E trailer was very fast service. Kept ya up to date with where your product location was. Got the product and installed the Tekonsha P3 electric brake controller on 06 toyota 4runner. Was very easy to installed with factory harness for my truck. Easy to setup. Havent got to use with the trailer yet 98338
by: Jim S02/04/2014
I have used the Prodigy brake controller before in another trailer. That is why I purchased it again. Extremely prompt service from e-trailer. Lots of e-mails from them starting from the order process through delivery. I am installing it in a 2014 Tundra. No instructions exist for a 2014 Tundra and no logical place to install it. I am going to put it on the console and use the metal bracket with double sided tape to install. No drilling and I can move it if I don't like the placement. 115675
by: Larry C08/08/2015
I'm using the harness in my 2008 Toyota Tundra. It is well made and fit the factory supplied plug perfectly. The only problem is that it's to short to reach anything but the lower part of my dash. I used the Tekonsha Pig tail supplied with it and spliced the two together. Then they reached the center of my Dash. The Tundra has a small cubby hole that the P2 will fit into, pops out for mounting, after drilling holes. Works fine and looks much better than right in front of your knees. 217757
Etrailer did a nice job. Communication on the shipping was timely and accurate. The item arrived as promised and installed with no problems. The only thing that might have helped would have been a little longer wires for the wiring adapter. Another 6" would have made routing, unit placement a little easier but I was able to find a solution that worked just fine and this is not a reflection on Etrailer. Overall a good experience and would recomend the Etrailer and the product. 32922Show More Reviews
Ask the Experts about this Brake Controller
Info for this part was:
At etrailer.com 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.