To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
This proportional brake controller has simple controls and a digital display for diagnostic information. Includes 3 boost levels, a slide-bar manual override, built-in battery protection, automatic leveling, and continuous diagnostics.
Features:
Specs:
You can adjust the gain (also known as output) with the thumbwheel on the front of the controller. Gain lets you set the maximum amount of power that will be applied to your trailer's brakes. A heavier trailer will need more power to achieve smooth, safe braking, while a lighter trailer will need less. Typically, the gain is only readjusted when you experience changing road conditions or if the weight of your trailer changes.
The boost setting controls the aggressiveness of your trailer's braking, meaning how quickly the brakes reach the maximum braking level. You can adjust this when you're towing heavy loads and you need more umph to bring your trailer to a stop. Your tow vehicle doesn't need that much power to brake in time, but your heavy trailer does.
Depending on the level of boost, your trailer brakes can start at either 13 percent or 25 percent of the set gain. What this means is that, 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.
If your trailer weighs less than your tow vehicle, no boost is needed. But, if you want your trailer to lead the braking, you can select level B1.
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.
To adjust the boost, use the blue push-button on the top of the Primus IQ.
The Tekonsha Primus IQ comes with an easy-to-reach, slide-bar manual override, great for stopping sway or controlling your trailer's momentum in emergencies. To engage the manual override, just push the slide-bar to the left, towards the center of the controller. This will activate the trailer's brakes and brake lights without you having to apply the brakes on your tow vehicle, perfect for limiting trailer movement while you're cruising.
The Primus IQ can mount between -90 degrees and 90 degrees vertically, but the brake controller still needs to be horizontally level and parallel with the direction of travel.
After mounting the Primus IQ unit in your cab using the included bracket, simply plug the included custom harness into your vehicle. The other end of the harness plugs into the brake controller. To remove the IQ for storage when you're not using it, just unplug the unit and slide it out of the bracket. With a replacement wiring harness (sold separately) and replacement bracket (6927 - sold separately), you can even transfer the IQ to another vehicle.
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).
The Tekonsha Primus IQ brake controller comes equipped with proportional braking to give you the best towing experience. Proportional braking means that your trailer brakes mimic your tow vehicle's brakes. If you slam on the brakes in your vehicle, 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's braking. This saves wear and tear on the tires and the brakes on both your vehicle and trailer.
The Primus IQ 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.
Alternate Instructions
California residents: click here
Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Today on this 2010 Toyota Tundra we are going to install part number 90885-3040P. First thing we will do is show you where the port is on the vehicle, this has a factory tow package. It is going to be underneath the dash on the left hand side. First thing we are going to do is plug the adapter cord into the factory port right here. Next, we are going to take our ground wire and ground it to the piece of sheet metal right here next to this fastener. :31
Then we will take our cord and route it behind the dash and over to our location where we are going to install our brake controller. We will let that sit for now. There is not much room to install the brake controller. This is because we can not do anything in this area here because that is where the air bag is. So what we are going to do is mount it offset. We will mount it to the flat spot here on the plastic. Make sure there is nothing in the way. We will have the bracket offset this way. 1:08
Now when we install this we are going to use just one side of the bracket. We are going to put our screw on this side and this side to help hold it up. Now that a second to set your brake controller up, make sure it is straight and aligned with the vehicle. Then we will use the other screw to help set it in place. Now we will plug the adapter cord into the back of the brake controller and then install the brake controller on the bracket. Snug up the screws. 1:56
Now this is tight quarters, what you can do is use a bit and a 1/4 inch wrench on the end to help you get a little extra torque in. With that, our brake controller is already installed. There you have it for part number 90885-3040P.
Easy to install and very affordable.
Quick install works Great
Worked great!
easy to install
Just what the doctor ordered. Thanks
Great for the price
Ordered as replacement for one that quit after 18 years. New plugged into existing wiring and even fits in existing mounting bracket. So far so good.
was easy to install and works great
Easy to hook up , works flawlessly
Easier to install than expected. Works flawlessly
Very easy installation.
Haven't tried it yet but it was very easy to install plug and play if you have tow package already
fast shipping, it installs easily. It's too early to comment on how good it works.
I went to all my local trailer places, auto parts stores and no one had a clue as to what I needed or how to install a brake controller. U-haul wanted $600 dollars to install a controller.
I visited e-trailer, bought $92, worth of parts, and watched an installation video, and a couple of hours later I was ready to tow.
Still working well after first year. Trailer is 16 foot dual axle with 4 wheel brakes used mostly to haul tractor & implements.
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