From a popular trailer parts site:
Tekonsha Prodigy P2 Proportional Brake Controller with GM Adapter (2003-2006) - 2003 GMC Yukon
The Prodigy P2 electric brake controller supplies power to your trailer brakes proportionally. It levels automatically and offers a variety of mounting options.
Features:
Applies power to the trailer's brakes in proportion to GMC Yukon's braking action
Brakes immediately instead of pausing like time-delayed brake controllers
Works when you're in reverse gear so that you can back into tricky parking spots
Includes a plug-in, GMC Yukon-specific brake-control adapter for simple, fast installation
Also includes a pigtail wiring harness that can be hard-wired into another GMC Yukon
Levels automatically
Self-adjusts to varying terrain
Eases installation and allows for more mounting options
Offers "boost" feature that adds more initial braking power when you're towing heavier trailers
Features a continuous diagnostic check
Monitors proper connection and magnet condition so that you can find problems before you hit the road
Furnishes protection for battery and brake-control functions
Reverse battery protection defends your brake controller and trailer breakaway systems from shorts
Power-saving mode reduces drain on the battery when GMC Yukon is not in use - draws only 3.6 milliamps
Shows voltage delivery to trailer brakes on a blue digital LED display
Has a built-in, rotary manual override lever
Detaches for easy portability - just unplug the brake controller from the brake-control adapter
Specs:
Application: up to 4-axle trailer brake systems (8 brake assemblies total)
Works with electric-over-hydraulic systems
Dimensions: 3-1/8" wide x 5-1/8" long x 1-3/16" high
Boost power increase: 0 percent, 14 percent and 28 percent
Mounting: 360-degree vertical range
Pigtail wiring harness length: about 34"
Limited lifetime warranty
The Prodigy P2 electric brake controller supplies power to your tow GMC Yukon's brakes proportionally. This means that your trailer brakes at the same time and with the same strength as your GMC Yukon - even in reverse gear. So if you have to slam on your truck's brakes, the trailer's brakes respond instantly, too - there's no delay. Thus your GMC Yukon's brakes aren't overworked from trying to stop the entire load, and they suffer less wear and tear. The P2 also cuts power to the trailer's brakes when your GMC Yukon is stopped - extending the life of the magnets and brake shoes in the trailer's brake assemblies.
Aside from smoother, more efficient braking that results from proportional application of stopping power, the Prodigy P2 also has a boost feature that gives you more initial braking power for those times when you're towing heavier loads. That's when more braking power is needed to stop the trailer at the same time as the tow GMC Yukon. The boost setting sends 13 or 25 percent more power (depending on which setting you choose) back to the trailer brakes, thus compensating for heavier loads. You can boost the power manually at the push of a button as well. The boost feature gets more power to the trailer brakes exactly when you need it most, and your fully loaded rig brakes smoothly and comfortably.
This brake controller levels automatically as you drive, so there's no problem using it on steep hills or when towing through the mountains. The self-leveling feature also makes the Prodigy easy to install: Simply mount it in your cab at any vertical angle (it has 360-degree rotation). It's easy to see the display and to access the pivoting manual override lever on the bottom of the unit.
The P2's continuous diagnostic check monitors your connection and magnet condition, so you can fix any problems before they land you on the side of the road. This newest version of Tekonsha's popular Prodigy brake controller has reverse battery protection to preserve the unit and accessory systems. And the power-save mode reduces battery drain when the controller isn't in use.
The included mounting pocket and GMC Yukon-specific wiring harness make your brake controller portable. Your unit slides out of the pocket mount for easy transfer of the brake controller to another GMC Yukon. And one end of the adapter harness plugs directly into your GMC Yukon, while the other plugs into your P2 - no hard-wiring required. Just unplug the unit to move it to another GMC Yukon or for storage. An instructional DVD that is included with the brake controller's written instructions allows you to take full advantage of all the features.
My comments: for a few extra bucks I bought a P3. I like the digital display better than the P2. Prodigy brake controllers can be installed ar almost any angle that makes them convenient to reach BUT they must be aligned along the same axis as the tow vehicle. Always install a brake controller where you can easily reach it from the driver's seat. They have a manual lever that you may need to use to add additional braking power to the trailer.
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