Tekonsha Trailer Brake Controller
- TK35HR
- Electric
- Electric over Hydraulic
- Proportional Controller
- Up to 4 Axles
- Tekonsha
- Under-Dash
- Plug-In
- Under-Dash Box
- Multiple Trailers
- LCD Display
The Tekonsha P3 is a brake controller beloved for its reliability and useability. You're able to save your settings and multiple profiles. It's easy to install, and with the custom harness, it's plug-and-play.
Features:
- Proportional - Smooth, safe, and good for your brakes long-term
- Great for a fleet - Save and customize multiple profiles
- Installs quickly - Mount the bracket to the dash, then attach the unit to the bracket
- Plug-and-play - Custom harness included
- Simple controls - Large, accessible buttons for all your settings
- Easy-to-read display includes diagnostics - Straight-forward messages get you to the root of the problem quickly
- Safe - Built-in safeguards protect vehicle, trailer, and controller
- Quick disconnect - Easy to unplug and remove the controller when you don't need it
- Automatic leveling - Must be parallel with direction of travel and horizontally level
Specs:
- Application: trailers with up to 4 axles (8 brake assemblies)
- Compatible with electric or electric-over-hydraulic trailer brakes
- Overall dimensions: 5" long x 3-1/2" wide x 1-3/8" tall
- LCD display dimensions: 1-3/16" wide x 9/16" tall
- Mounting range: 360 degrees vertically
- Warranty:
- Limited lifetime on brake controller
- Limited 1-year on wiring harness
Braking Output
![Tekonsha Prodigy P3 brake controller]()
Braking output is the maximum amount of power that will be applied to your trailer's brakes. How much braking output you need is determined by the weight of your trailer; a heavier trailer will need more power to bring it to a stop. You want to go as high as you can without the trailer brakes locking up.
Use the arrow buttons on the front of the module to set the output.
Power Boost for Heavy-Duty Towing
The boost setting controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. If your vehicle takes too long to come to a stop, increase the setting. If it stops too abruptly, decrease the setting.
Depending on the level of boost, your trailer brakes can start at either 13 percent or 25 percent of the set braking output. So instead of starting at 0, the brakes will start at 25 percent and get to 100 percent sooner. This keeps the trailer from pushing your tow vehicle forward.
Boost Levels:
| Approximate Gross Trailer Weight | Boost Level | Increase in Initial Power Output |
| Less than tow vehicle GVW | B1 | 13% |
| Equal to tow vehicle GVW | B1 or B2 | 13% or 25% |
| Up to 25% more than tow vehicle GVW | B2 or B3* | 25% |
| Up to 40% more than tow vehicle GVW | B3* | 25% |
*Both B2 and B3 offer a 25-percent boost in initial power. But the braking curve for B3 is more aggressive than that of B2. This means that, even though you will start out with the same intensity when using these boost levels, you will get an overall more aggressive braking experience with the higher level. So if you use B3, you will reach maximum braking sooner than if you use B2.
Manual Override
To engage the manual override, twist the rotary-style lever from right to left. This will activate the trailer's brakes and brake lights independently of your vehicle, great for stopping sway or controlling your trailer's momentum in an emergency.
Save Your Settings in Multiple Profiles
The P3 is able to store your settings in multiple profiles so that you can have them ready to go for different trailers and drivers. Even the display is super customizable: you can change the screen color, brightness, and language to make it easy to use.
![Tekonsha Prodigy P3 review]()
Troubleshoot with Detailed Diagnostics
The P3 makes it easy to troubleshoot problems as they come up, with comprehensible and detailed diagnostics displayed on the screen.
![Display screen when P3 unit turns on.]()
![Boost mode one.]()
![Boost mode two.]()
![Boost mode three.]()
![Display screen is white.]()
![Display screen is green.]()
![Display screen is orange.]()
![Display screen is light blue.]()
![Display screen is purple.]()
![Display screen is blue.]()
![Display screen is pink.]()
![Display screen is cyan.]()
![Screen displays force of braking.]()
![Screen displays warning open ground no brakes.]()
![Screen displays no trailer connection.]()
![Screen displays no trailer connection.]()
Diagnostic troubleshooting messages include:
- Battery voltage
- Voltage supplied by stop light switch when brake pedal is depressed
- Output voltage to trailer brakes
- Output current to trailer brakes
Diagnostic warning signs include:
- Open ground
- Overload
- Output short
- Power loss
- No trailer connection
Safety Features
The Prodigy P3 offers advanced safety features to prevent damage to various components of your towing setup.
-Integrated reverse battery protection shields the brake controller and your trailer's breakaway system from shorts.
-When the P3 is not in use, it draws only 3.6 milliamps, minimizing drain on your vehicle's battery.
-Any time your vehicle and trailer are at a standstill with the brakes applied for more than 5 seconds, the hold feature will kick on and reduce power to just 25 percent. This will keep your trailer in place without your brakes overheating.
Installing the Tekonsha P3
Installing the P3 is incredibly simple. You'll mount the bracket to your dashboard then mount the unit to the bracket. Plug the custom harness into your vehicle and into the unit. Done!
Keep in mind that the P3 must be horizontally level and parallel with the direction of travel to work correctly.
![Correct P3 mounting]()
![360-Degree P3 mounting]()
With a replacement wiring harness (sold separately) and replacement bracket (TK5906 - sold separately), you can even transfer the Prodigy P3 to another vehicle.
![P3 mounted in bracket]()
![P3 mount]()
Note: If you don't already have a 7-way plug at the back of your vehicle, take a look at our exclusive 7- and 4-way brake controller installation kit (ETBC7 - sold separately).
What is Proportional Braking?
![What is proportional Braking]()
Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes, your trailer brakes will activate with the same intensity; if you brake lightly, your trailer brakes lightly too. The trailer's braking is in proportion to your vehicle and trailer.
The Prodigy P3 uses an internal inertia sensor to detect how your vehicle is braking so it can send the right amount of braking power to your trailer. It measures the inertia of your tow vehicle and activates the trailer's brakes to slow at the same rate. The result is uniform braking across your towing setup. No push-pull action - just smooth, proportional braking every time.
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Installation Details 
Alternate Instructions
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