Brake Controller

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Brake Controller

Available Models for 2003 Chevrolet Brake Controller


Brake Controller

Brake controllers are an essential part of a towing system with electric trailer brakes, and they offer a much-needed emergency braking feature. We offer high quality controllers from manufacturers such as Draw-Tite, Tekonsha, Valley, Hidden Hitch and Hopkins. Featuring both time-delay and proportional models, we have the right controller for any application. Brake controller wiring adapters are available for many vehicles, allowing for simple plug-and-play installation. Hardwire kits are also available to make any installation hassle-free.

Find your custom fit brake controller wiring adapter for a plug-in application by selecting the year of your vehicle to the left. We offer custom fit plug in adapters for many of the most popular vehicles, including Ford, Chevrolet, Dodge, GMC, Nissan, and Toyota.






Brake Controller Manufacturers


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2003 Chevrolet Questions and Answers


  • Tire/Wheel Combo to Replace 18.5 x 8.5-8 Tires on Snowmobile Trailer
  • The 18.5x8.5-8 is actually an old tire size that is not used much anymore. The closest metric size to your existing tire would be 215/60-8, which is what I would recommend. Your wheel most likely has a 5-on 4-1/4 inch bolt pattern (see link below), you will want to make sure that the bolt pattern of your existing wheels matches that of the replacement wheel. We offer a 215/60-8 load range C, 935 lb capacity tire on a white painted rim as part # AM3H200. When inflated to its 50 psi maximum...
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  • Replacement Mounting Hardware & Brackets for the Westin E-Series Round Nerf Bars # 23-1680
  • Yes, we can help you with replacement installation brackets for your Westin E-Series Round Nerf Bars # 23-1680 on your 2003 Silverado 2500HD. The correct replacement mounting kit for your truck and nerf bars is part # 23-168PK. This kit includes brackets, bolts and washers. Westin suggests an application of automotive wax on their stainless steel bars to help retain their high-polish finish. In case you are interested in other enhancements for your truck I have linked you to our...
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  • Location to Mount 7-Way Connector In Truck Bed for 5th Wheel
  • Some model year trucks have a greater distance between the outer fender and the inside of the truck bed in the area directly behind the rear wheel well, which is typically why you see the trailer connector for the fifth wheel installed there. You could install the connector forward of the wheel well if you wish, but if you do, I would recommend using a 90-degree plug like the Bargman # 50-97-410. A 90-degree plug needs less space behind the bed wall. Keep in mind that you will need...
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  • Removing Cover of Fuse Box on 2003 Chevy Silverado HD to Activate Trailer Charging System
  • The fuse box in your 2003 Chevrolet Silverado HD is located on the driver-side engine compartment. Opening it will require removal of a support bracket in the corner closest to the driver. The fuse box is just forward of this bracket. With the bracket removed the top cover of the Accessory Fuse Block can be snapped off. Next you will remove the lower cover to reveal the auxiliary positive power posts. Please refer to the linked article on brake controller installation which provides detailed...
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  • Location of Brake Controller Port on a 2003 Chevrolet Silverado 2500 HD
  • If your 2003 Chevrolet Silverado 2500 HD has the factory installed hitch and a 7-Way connector, then all of the wires for the brake controller have been run. The factory brake controller port is located in the black box underneath the dash on the drivers side, to the left of the brake pedal. Usually a brake control adapter will be included in the junction box. If an adapter is not in the junction box you can use the Draw-Tite Universal Brake Control Wiring Adapter, part # 3015-S, for...
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  • Recommendations for Horsepower and Torque Increase On 2003 Chevrolet Silverado 1500 6.0
  • We do have a product that will help increase the torque and horsepower of your 2003 Chevrolet Silverado 1500 6.0, but the Edge Insight CTS # EP84130 is not equipped to do that as it is not a performance-enhancing device. It provides the driver with various vehicle data only. For a product that will provide the gains you are looking for, I recommend the Superchips Flashpaq F5 Performance Tuner # SU4845. This product is pre loaded with performance enhancements such as increased throttle...
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  • Trailer Tire Recommendation for a Boat Trailer with 5.30-12 Tires and Towing at Highway Speeds
  • All of the ST (Special Trailer) tires that we carry are DOT (Department of Transportation) rated for 65 miles per hour unless stated otherwise on the tire. It is not recommended to run a trailer tire at a higher speed than 65 miles per hour due to the heat buildup that will occur inside the tire and cause the tire to break down and cause the tire to fail. All trailer tires are constructed with thicker sidewall dimensions for handling weight and are designed to be used at 65 miles per...
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  • TorkLift SuperHitch and 42 Inch SuperTruss Extension for a 2003 Chevy Silverado 3500
  • For your 2003 Chevy Silverado 3500 there are 2 TorkLift Super hitches available and they only fit long bed versions of the truck. First is the SuperHitch Magnum # TLC1205-30. And second is the SuperHitch Original # TLC1205. The biggest difference between these 2 is capacity. The Magnum is rated for 20,000 pounds gross trailer weight and 2,500 pounds tongue weight. When used with weight distribution it is rated for 30,000 pounds gross trailer weight and 3,000 pounds tongue weight. Capacities...
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  • Installation Instructions for Westin Sportsman Grille Guard for 2003 to 2007 Chevy Silverado 2500HD
  • If you have Westin Sportsman Grille Guard # 40-1245 the instructions are linked on the product page on the right hand side. I have also included a link for them here also to the right. If you have # 45-1240 I have linked those instructions for you as well.
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  • How to Adjust Hitch Head Angle of Reese Strait-Line Weight Distribution Hitch # RP66074
  • The complete installation instructions for the Reese Strait-Line Weight Distribution Hitch # RP66074 are attached for your reference. While these do provide complete adjustment instructions for the hitch head angle the chart you referred to (from page 2 of the instructions) is also provided in the linked photo. The chart includes images of several coupler styles and provides the spring bar height (dimension Y) based on the coupler style and measured coupler height. You might refer...
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  • Replacement 7-Way Trailer Connector for a 2003 Chevy Silverado 2500HD
  • I actually recommend that you use the Hopkins connector, # HM40975, because it comes with a 7-Way and a 4-Way and also comes with a bracket. The connection at the back is made to fit the factory harness on a 2003 Chevy Silverado that came with a factory 7-Way. I have included a link to a video that shows a typical installation for you. If you want to go with a regular 7-Way use # PK11893 and bracket # PK12711U.
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  • Does 12V Pin on 7-way Trailer Connector Always Have Power
  • It sounds like you're asking about the 12V circuit on the 7-way trailer connector on the rear of your 2003 Chevrolet Trailblazer. Some vehicles will always have power and some others will not. We don't have this specific information for your vehicle, but to determine if your 12V always has power you can test the pin in the 1 O'clock position on your 7-way. The other pins will have power when the corresponding light is used or the brake pedal is pressed.
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  • Front Mount Hitch Fascia Trimming Required for a 2003 Chevrolet Silverado Duramax
  • All of the front mount hitches for the 2003 Chevrolet Silverado may require trimming of the black plastic fascia, that is mounted under the front bumper of your truck, depending on how the front bumper is mounted to the frame on each individual vehicle. The Draw-Tite hitch, item # 65023, for the 1500LD series truck does not require trimming of the fascia in most cases, see photo. Since you have a Duramax engine in your truck, you most likely need a front mount hitch that will fit a...
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  • Why do the K-Source Custom Towing Mirrors Reset the Adjustment when the Truck is Turned Off
  • It sounds like your truck has the Curb Assist feature which allows for your OEM mirrors to keep memory settings and automatically adjust. Unfortunately, the K-Source Custom Towing Mirrors are not designed to work with the Curb Assist feature on GM trucks because that is a patented feature that aftermarket manufacturers are not allowed to duplicate. If the Curb Assist feature was not deactivated, then the power settings on your mirrors reset every time you turn off the truck. K-Source...
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  • Wiring a 2003 Chevrolet Kodiak C-5500 for a Brake Controller with Factory Style Wiring Harness
  • When wiring the red brake switch wire on the brake controller you should use a circuit tester to determine the wire that goes hot only when the brake pedal is pressed. If you find a wire that has voltage on it before the brake pedal is pressed and then gets brighter when the brake pedal is pressed that is the wrong circuit and should not be used. If your Kodiak has the prewired connector under the dash for the Tekonsha Wire Replacement for GM Vehicles, 2003 - 2006, then this should be...
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  • Wiring Codes AUX and CHMSL During Brake Controller Install on 2003 Chevrolet Trailblazer
  • The code AUX refers to auxiliary which is auxiliary power, which should be the Dark Blue wire on your 2003 Chevrolet Trailblazer. This wire will connect to the Dark Blue wire on the brake controller and should be connected to the 7-way as the brake output wire. The code CHMSL refers to Center High Mounted Stop Light, which is your third brake light circuit. This is the brake signal wire and will be connected to the red wire on the brake controller. This wire should only get signal when...
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  • Troubleshooting Trailer Brake Lights Not Working on a 2003 Chevy Silverado 1500
  • Since the lights on the truck are working but the lights on the trailer are not, I am inclined to believe that the problem is on the trailer side but I do not want to rule out the truck just yet. First, I recommend testing the trailer connector on the truck side. You will need 2 things. First, you will need a circuit tester like # 3808 if you do not already have one. Second, you will need someone to sit in the truck to run the lights while you test the trailer connector. The brake lights...
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  • Troubleshooting A Tekonsha P3 Brake Controller that Says Power on the Display
  • The Tekonsha P3 Brake Controller, item # 90195, has built in troubleshooting diagnostics that you can access by pressing the menu button then selecting help and pressing ok. You will then be able to monitor the battery voltage supplied to the unit, black wire, the voltage supplied when the brake pedal is pressed, red wire, and the output voltage and amps sent to the trailers brakes, blue wire. If one of these connections is wrong you should get a warning screen. If you have the caution...
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  • Transmission Cooler Recommendation for a 2003 Chevy Silverado 2500HD
  • You mentioned wanting the best cooler for your 2003 Chevy Silverado. The best, as in the most amount of cooling, is going to be a remote cooler with its own fan like # D13960. It does not matter where this cooler gets mounted because its fan offers the optimum amount of cooling all the time. Otherwise for a standard cooler that would require air flow I recommend # D13105. Its large surface area will provide plenty of cooling for your trucks transmission. To avoid cutting and flaring...
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  • Recommendation For Correct Weight Distribution System With Sway Control For Jayco Jay Flight Trailer
  • I would recommend the Strait-Line Weight Distribution System w Sway Control - Trunnion Bar - 12,000 lbs GTW, 1,200 lbs TW, part # RP66084. This weight distribution is suitable for trailers with a tongue weight between 600 and 1,200 lbs. Part # RP66084 also features dual-cam sway control which acts to prevent trailer sway before it starts. Part # RP66084 comes with all necessary hardware and includes the proper shank. You will need to purchase a 1-1/4 inch diameter hitch ball, with a...
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  • Hub and Wheel Recommendations for Converting to Oil Bath Hubs
  • As far as caps are concerned the main difference between an oil and grease caps is how they have to attach to the hub. Grease hubs will press in, while oil seals need to be screwed into a threaded hub. You will need to upgrade to oil bath hubs. We have oil bath hubs that would fit your spindle, except they all have an 8 on 6-1/2 inch bolt pattern. One of them is the Trailer Hub and Drum Assembly # 8-219-9UC3. This hub would work on your trailer, but you would need rims that have the...
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  • Testing Trailer Brakes that are Getting Weak on a 8-1/2 X 24 Foot Cargo Trailer
  • It sounds like the magnets are getting worn and are not supplying the enough force to the brake assembly when the brakes are applied. The first thing I would do is use a voltage tester and check the brake output wire on the trailer while someone uses the manual knob in the cab. If you are not getting full power, you will need to test the brake controller for proper function. If you are getting full power with the manual slide fully engaged, then you will need to remove the hub and check...
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  • Connecting to Generator from 50 Amp Service on RV
  • For the 3 prong 30 amp outlet on your generator, I recommend using the Power Grip Generator 30 Amp to 50 Amp RV Power Cord Adapter # CAM55412. The 3-Prong twist-lock design will connect with the outlet on the generator and the female end will connect with your RV's 50-amp power plug. This adapter is rated for up to 125 volts. For higher voltage items, you can use the Mighty Cord Generator Adaptor # A10-G30450VP. This is rated for up to 240 volts of power and will connect to the 4 prong...
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  • No 12 Volt Power Reaching Trailer Connector on 2003 Chevrolet Silverado 2500HD
  • In later model years (2007-2011) Chevrolet did not complete all the trailer wiring connections, but this should not be the case in your 2003 Silverado. If your 7-way has worked previously then there is a chance the connector is corroded or damaged, or that the factory wiring has failed. Check for signs of whitish or greenish discoloration on the contacts and apply an electrical contact cleaner as needed. Inspect the connector for damage and to ensure all wiring to the connector pins...
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  • Brake Controller Installation Instructions on a 2003 Chevrolet Avalanche Without Factory Tow Package
  • Yes, we do have a photo, see link, that shows the location of the brake controller power wire and the brake controller output wire that need to be connected under the hood on your 2003 Chevrolet Avalanche if you do not have a factory 7-Way. We also have detailed instructions, see link, to help with the installation of the P3 # 90195 and wiring adapter # 3015-P brake controller on your Avalanche. The red wire shown in the photo is the power wire for the brake controller. This wire should...
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  • How to Install T-One Vehicle Trailer 4-Pole Wiring Harness # 118372 in 2003 Chevrolet Tracker
  • The T-One Vehicle Trailer 4-Pole Wiring Harness # 118372 that you referenced is a correct fit for your 2003 Chevrolet Tracker. This 4-pole trailer harness installs by simply plugging in to a connection point in the rear cargo area of your Tracker. You do not need to cut or splice any wires. I have linked a video showing installation in a different vehicle but the process will be much the same. I have also linked the written instructions. Once you have connected the harness to your...
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  • Hitch Recommendation for a 2003 Chevy Silverado 1500 with Roll Pan Bumper
  • The best recommendation I can make for you is a Class III hitch like the Curt # 13932 which is designed to fit your vehicle that has an aftermarket roll pan bumper. There are no Class V hitches designed to work with your setup currently but this hitch would work well. This hitch has the capacities of: Maximum gross trailer weight: 5,000 lb Maximum GTW when used with weight distribution: 8,000 lbs Maximum tongue weight: 500 lb Maximum TW when used with weight distribution: 800 lbs I...
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  • Identifying Transmission Lines on a 2003 Chevy Silverado with 5.3 Liter and Cooler Recommendations
  • I had a vehicle with this same engine and had a transmission cooler to it. The easiest way to find the correct lines going to and from the transmission is to start the motor and put it in drive for about 10 seconds or so. Then, put the vehicle back in park and turn off the motor. Under the truck feel both lines from the transmission. One will be warmer the other cooler to the touch. The cooler one is the return line. A supplemental cooler installs in line after the factory cooler. So...
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  • Trailer Brake Controller Wiring Harness for a 2003 Chevy Silverado
  • It sounds as if you might have the wrong wiring adapter. The wiring adapter for the 2002 and 2003 Silverado will fit either vehicle, but the order in which the pins are wired is different. Therefore if you have the incorrect one, it will still plug in, but will not work correctly. For the 2003, you would need part # 3015-P, not the 3025-P which is for the 2002. This can easily be verified by using a circuit tester like part # 3808 on the red wire exiting the rear of the controller. If...
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  • Replacement Oil Cap for Dexter Hub # 21-35
  • The Kodiak Oil Cap # KPCAP you are looking at is a replacement cap for the Kodiak Pro Lube Kit. The oil cap you need is the Redline Oil Cap, Plug and O-Ring for Dexter 7-9K Trailer Axles # RG04-230. This will replace the oil cap on your trailer axles with Dexter 8-bolt hubs. I attached a review video of this oil cap you may want to check out.
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