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Trailer Brake Controller Installation - 2005 Chevrolet Avalanche

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How to Install a Trailer Brake Controller on a 2005 Chevrolet Avalanche


Today on a 2005 Chevrolet Avalanche we're going to install part number C51140. This is a Curt TriFlex Trailer Brake Controller. All right. Now to help us with our install to plug into the factory tow package on our Avalanche, we're going to use part number C51352. This is a Curt Custom Wiring Adapter for trailer brake controllers. We'll go ahead and find our tow package port to begin with. We'll open up the driver's side door and look right behind the parking brake pedal. Well see a small black box with a screw in its center that we have to remove.

Now there's a black cover on top the junction box that we have to remove and a plastic nut that we have to unscrew and we can go ahead and take the cover off. Now the cord is going to plug into this socket right here, so starting from the left and going to your right, it'll be the second one over. These is our TriFlex brake controller and here's the end of our port. We'll go ahead and take our adapter cord and we'll plug these two together. This end of the cord will go underneath the dash into the junction box. We'll go ahead and plug that into the correct slot, push it in until it clicks and then we can go ahead and put our cover back into place. Like to route the cord over the gap, over the top of the box and put it back into place.

Now all we need to do is find a spot for our brake controller. We'll go ahead and mount our brake controller typically right here. There's actually a nice middle brace that we can take the bracket and attach it to and then our brake controller go to our bracket. This is a bracket we're going to attach to the sheet metal right here. What we're going to do is hold it up in place and then we're going to use just a simple spring clamp to hold it in place. We'll go ahead and line it with the back edge of the sheet metal and then we'll install our screws. Now the screws that come with it are actually designed for plastic and not into the metal that we're going to use so we're going to substitute those with some self-tacking screws.

These are number 8 screws with self-tapping bit. Use a quarter-inch nut driver. Okay, let's go ahead and attach our brake controller to our bracket. Now this brake controller uses these very small machine screws to attach to the bracket and into the brake controller. Now when you install the screws, they go through a plastic bushing that's built into the bracket. Now it's a really tight fit so let's kind of push it through the plastic bushing inaudible 00:03:07 go into the brake controller.

It's a tight fit so you have to use a little more force than you think you would. Our brake controller is hooked up. Let's go ahead and take a few moments to zip tie our wires and get them out of the way. All right. We'll go ahead and cut the tails off of the zip ties and we should be good to go for our install. Next we'll go ahead and test it. Okay, let's go ahead and check it out real fast. First we have a little red dot here. This shows us we've got power going to our brake controller. Over here's a manual override. That's not doing anything right now because we don't have a trailer hooked up to it. Now the wheel up on top here controls how much power goes out. Basically it shows power on a scale of 1 to 10, almost 10 there and almost 1 there. We'll put her back about half way. Let's go ahead and hook a trailer up to it and see how it works now. All right. Now I've got a second dot showing that our trailer is connected and it's in standby mode. Let's go ahead and move the manual override. You can see how it goes up to the limit we set earlier with the wheel here. All right. Let's go ahead and try the foot brake. All right. It shows a signal with a small amount of voltage going up to 1.7 so we know our foot brake's working too. There is a slide lever on the left hand side here that controls the sensitivity, from level 1 up to level 9. We'll go ahead and set that in the middle as well. Now L1 is going to be the least aggressive in braking and we go all the way up, L9 will be the most aggressive braking. It's always a good idea to start in the middle or maybe even lower and try out the truck and trailer for a test drive in a parking lot or back road and adjust the performance as needed to work with the truck. With that, that'll finish it for an install of part number C51140, the Curt TriFlex Trailer Brake Controller and our Wiring Adapter Plug, part number C51352, the Custom Wiring Adapter for trailer brake controllers on our 2005 Chevrolet Avalanche. .


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