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2003 GMC Sierra Accessories

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2003 GMC Sierra Videos

Thule Traverse Roof Rack Installation - 2003 GMC Sierra

Today we are going to review part number TH480 from Thule. This is Thules traverse foot pack. And we will also be using fit kit part number THKIT1522. And the cross bars we will be using on this demonstration will be THLB58. Those are sold separately. And we will be taking these parts and will be installing these on a 2003 GMC Sierra extended cab pickup truck. We have our parts here laid out with just one end of the bar so you will not get confused. We will flip the whole assembly over so you can see it easier. We are going to start off with our tower here. To slide it onto the bar, what we are going to have to do is loosen this clamp up. So we pull back on this latch right here. Then we can slide our bar in. We will just leave that loose for now. We are going to pop on our little cap. We are going to need to open up this door here. It just snaps open. And while we are here, we will use this tool to tighten down this screw which actually will clamp it down to the car. Then next we will go ahead and install the fit kit itself. 1:00





2003 GMC Sierra Questions and Answers


  • Is Bottom Mirror of K-Source Custom Towing Mirrors Flat or Convex and Adjustable for 2003 GMC Sierra
  • I spoke with my contact at K Source and the bottom mirror in custom towing mirror set # KS62075-76G is convex and the top mirror is flat. It is the same for both sides. The bottom mirror is manually adjustable. The top mirror is electrically adjustable if the truck has that feature.
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  • Do the K-Source Custom Fit Replacement Towing Mirrors Vibrate More than Factory Mirrors
  • Because the K-Source replacement towing mirrors # KS62075-76G mount to the same location as the factory mirrors, vibration should not be any greater than with the factory mirrors. Vibration can be an issue with universal mirrors and clip-on towing mirrors in part because you have one part mounted to another which adds a point of possible movement. Since these mirrors mount in place of the OEM mirrors you will not have that extra link in the chain.
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  • Suspension Enhancement for a 2003 GMC Sierra 1500HD 4x4 Quadrasteer
  • The cab style in this case is not going to matter. The Quadrasteer limits things a little but there is a kit that will work. You can use # TGMRCK15S on your 2003 GMC Sierra 1500HD. I have included a link to a video showing an actual installation on a 2005 model and a link to the installation details for you.
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  • Tracking Down Wiring Problem on Trailer Towed by 2003 GMC Sierra
  • Having the right and left turn signals flashing at the same time indicates a ground problem. Make sure the ground connection on the trailer is secure and not corroded. The trailer connector will usually have a white wire leading from it that grounds somewhere on the trailer frame, usually on the trailer tongue. The trailer lamps will ground to the trailer frame in one of two ways, either through their attachment studs being in direct contact with the trailer frame or by a separate ground wire. A
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  • Recommended Wiring Adapter for an Older Tekonsha Voyager Brake Controller on a 2003 GMC Sierra 1500
  • You can buy an adapter for your Tekonsha Voyager brake controller for your 2003 GMC Sierra 1500. I recommend using the Tow Ready Wiring Adapter, part # 20264. There will be some splicing involved because the older Tekonsha Voyager brake controllers came with blunt cut wires rather than a plug-in style connector. You can simply splice the wires from your Tekonsha Voyager brake controller to the wires from this wiring harness color for color. The Tow Ready harness includes butt connectors for
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  • Under-Bed Install Kit for a 2003 GMC Sierra 3500 that works with a Draw-Tite 16 K Fifth Wheel Head
  • I have confrirmed with my contacts at Reese and both the under-bed rail kits # RP30082 and # RP30062 are considered a fit your 2003 GMC Sierra 3500 with a Duramax dually with an 8 foot bed. The # RP30082 install tech tips indicate that no drilling is required for the installation of the frame brackets. It utilizes existing frame mounting holes already on your truck. Where as the # RP30062 installation tech tips indicated that two holes will need to be drilled to install each frame bracket.
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  • Parts Needed to Flat Tow a 2003 GMC Sierra with a Roadmaster Falcon 5250 Tow Bar
  • The first thing you are going to want to do is consult the truck owners manual for specific information on flat towing it. There are different configurations of the 2003 GMC Sierra 1500 and would require different base plates. If you have a Z71 model and the front suspension uses a torsion bar use # 199-6 or # 199-5. If you have an HD model (torsion or coil springs) use # 3115-1 or # 3115-3. If you do not have a Z71 or HD and have coil springs in the front use # 199-10 or # 199-11. Any
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  • 5th Wheel to Gooseneck Adapter for a 2003 GMC Sierra 3500 Crew Cab with Curt Gooseneck Hitch # C-52
  • I may have an option that will work for you, however, the Curt X-5 Gooseneck to Fifth Wheel Adapter, # C16210, will not fit in the Curt Folding Ball Gooseneck Hitch, # C-52, that you have installed in your 2003 GMC Sierra 3500. The X-5 adapter was designed to work with the Curt Double Lock, Flip and Store Gooseneck Hitch, # C60625. We do have other fifth wheel to gooseneck adapters that should work for you. One of our most popular adapters is the Convert-A-Ball Cushioned Fifth Wheel Adapter,
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  • Troubleshooting a Voyager Brake Controller for No Lights When Brake is Applied
  • Have you tried testing the controller with the trailer connected and the truck moving? The vehicle needs to be moving for the controller to work. Otherwise you might need to set the level of the controller. I attached a picture that I took from the troubleshooting chart of the installation instructions that covers the issue you are having with this controller.
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  • Suspension Enhancement for a 2003 GMC Sierra 2500 HD Hauling a Trailer and Truck Bed Camper
  • The Timbren Rear Suspension Enhancement System is a great way to assist your trucks suspension when carrying a camper and towing. I use a set of the Timbren springs on my truck when I tow and I would recommend them for anyone towing a trailer or carrying a camper. The Timbren System, # TGMRCK25S, is the correct system for your 2003 GMC Sierra 2500 HD Crew Cab 4X4. The important thing to remember when adding a rear suspension enhancement system is that it will not increase the weight carrying
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  • Location to Install Brake Controller Power Fuse on 2003 GMC Sierra
  • I am assuming you are speaking of the fuse that activates the power feed to the brake controller. The 30 amp fuse is installed in the power distribution box as shown in the photo I have edited. The power distribution box is located under the hood, on the drivers side on the fender well. I have linked you to an FAQ article that describes how to install a brake controller on a 2003 GMC Sierra.
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  • Fit of Draw-Tite Class III Hitch # 41938 on 2003 GMC Cab/Chassis with Service Body
  • It is very difficult to provide a definite yes or no answer about hitch fit when a service body is involved. I can provide you with some measurements and parameters that would allow you to take some measurements from your truck and determine if the hitch will fit. First of all, your frame must measure 34 inches, outside to outside distance. If you measure from the rear of the frame member toward the front of the vehicle, you must have at least 19 inches of open and unobstructed frame rail
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  • What Does Hitch Not Rated for Use with Weight Distribution Mean for a Trailer Hitch
  • A trailer hitch that is not rated for use with weight distribution means that the hitch cannot be used with any type of weight distribution system because of its bracket design (short brackets on this hitch) and they could have also found in testing that it does not hold up well with weight distribution. This hitch is also made for cab and chassis models of the 2003 GMC Sierra so if you have a regular pickup this hitch will not fit. If you do have a cab and chassis model then Curt trailer # C
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  • Will the K-Source Custom Extendable Towing Mirrors Heat/Electric work on 2003 GMC Sierra w/o Heat
  • Yes, the K-Source Custom Extendable Towing Mirrors w/ Turn Signals # KS62075-76G that you referenced will still install on your 2003 GMC Sierra that has electric mirrors without heat, but since your vehicle is not equipped for the heat function the mirrors would not heat. Basically these mirrors will function exactly like your factory mirrors.
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  • Will the Universal Sidewinder Wedge Work on a Reese 5th Wheel Trailer Hitch
  • In most cases, the universal wedge that comes with the Sidewinder will work. For a Reese 16k hitch like # RP30051, the universal wedge is all you will need. Keep in mind that the hitch will need to always remain locked in the towing position and never slid forward with the Sidewinder installed. Doing so would create problems with too much stress on the system, move the trailer weight too far behind the rear axle of the towing vehicle, and could interfere with the truck tailgate.
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  • Replacement Drivers Side Mirror For 2003 GMC Sierra 2500
  • We do have a drivers side mirror for your 2003 GMC Sierra, but the CIPA Replacement Mirror # CM27352 you referenced is not a compatible fit. The most recent GMC Sierra the # CM27352 will fit is the 2002 model. For your vehicle, I recommend the CIPA Replacement Mirror # CM27376, a direct replacement for your Sierras mirror OE # 15048182. The installation is pretty easy as it bolts to existing mounting holes using existing hardware and it comes with a 1-year warranty.
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  • Diagnosing Malfunctioning Tekonsha Voyager Brake Controller on 2003 GMC Sierra
  • It is pretty unlikely that the factory connection point under the dash where the controller plugs in has been pinned incorrectly. I would begin by checking under the hood to ensure that the final brake controller connections were made at the power distribution box on the inside of the drivers side fender. Depending on how the vehicle was equipped, in may cases this connection was not made on the assembly line. As you can see in the provided photo, look for a red wire with a ring terminal on
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  • Parts Needed to Tow a 5th Wheel Trailer with a 2003 GMC Sierra 6-1/2 ft Bed
  • Since you have a 6-1/2 foot bed you are going to need a sliding hitch like the Curt E5 5th Wheel Trailer Hitch w/ R16 Roller # 16516 that you referenced. For the correct installation kit to install this hitch in the bed of your 2003 GMC Sierra you will need a Curt Fifth Wheel Installation Kit # C16418-104. Now for wiring to allow you to install a trailer 7-way in the bed of your truck as well you would want a Draw-Tite Fifth Wheel and Gooseneck Wiring Harness # 20110. I attached an installati
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  • Can a Fixed Pro Series 5th Wheel Trailer Hitch Change to a Slider for a 2003 GMC Sierra Short Bed
  • Yes, you can change over your 15K Pro Series 5th wheel hitch from a fixed to a slider. You will need to use the Pro Series Fifth Wheel Slider w/ Rollers, # RP30092. I have linked a video and instructions for you. This slider will provide 10 inches of travel. To make sure the slider will provide enough clearance for you to safely make tight turns without hitting the trailer and truck cab together, there is a simple formula you can use. Measure from the center of the hitch jaws where the kin
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  • Compatibility of TruXedo TonneauMate Truck Bed Toolbox with 2003 GMC Sierra 1500
  • According to my contact at Truxedo, their TonneauMate toolbox, part # TX1117416 is indeed compatible with your 2003 GMC Sierra, unless you have a flareside, stepside or composite bed. If your truck has the GM Cargo Management System, which is the factory installed tracks along the top edge of the bed side, you will also need a clamp kit, part # TX1117458.
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  • Towing Mirror with Maximum Extension for 2003 GMC Sierra 2500
  • The Longview Towing Mirror, part # CTM1500 would extend just a bit more farther than the CIPA # 10801 and 10802 you are currently using. If you look at the provided photo I provided, you can see that the CIPA product extends 5-1/2 inches beyond the edge of the factory mirror while the Longview # CTM1500 extends by 5-1/8 inches. I do not believe the 3/8 inch larger extension offered by the Longview mirror would make much difference to you. Even a Custom Extendable Towing Mirror like part # KS6
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  • Anderson Ultimate 5th wheel Connection Recommendation for a Flatbed with Recessed Ball
  • Actually there is an Andersen Ultimate 5th Wheel Connection available specifically designed to be used on vehicles with flat beds that have a recessed ball like what you have. You would want a part # AM3235. This product comes with a 4 inch extension to reach your ball.
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  • Firestone Air Spring Suspension for 2003 GMC Sierra 1500
  • For your 2003 GMC Sierra 1500, the correct Firestone Air Helper Springs would be part # F2320. In order for the springs to fit your truck, the minimum allowable distance between the inside of the tire and the outside of the frame member is 6 inches. Other than drilling mounting holes in the frame members, not modifications are required. You can look at the installation instructions I have linked you to for more information. The # F2250 you referenced will fit the 2500 and 3500 series only, an
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  • Tailgate Lift Assist System for a 2003 GMC Sierra 1500
  • For a lift assist, you can use Hopkins EasyLift, # 74211 and it takes up 80 percent of the weight of the tailgate. I have linked a video review of this system for you. Or for a Tailgate lowering system for a 2003 GMC Sierra, you would need part # DZ43100. I have included a link to the installation instructions for you to view.
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  • Tongue Weight Capacity when Using Titan Trailer Hitch Extension RP45292 with Weight Distribution
  • A weight distribution system is used to more evenly distribute the weight of the trailer to all axles of the trailer and tow vehicle. When using the extension, # RP45292, the tongue weight capacity is going to depend on the length the extension is cut to. If it is cut down to 24 inches, the tongue weight capacity 600 pounds. At the 34 inch length the capacity is 450 pounds. It does not sound like you have a weight distribution if you are using the extension and a ball mount and are connected
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  • Brake Controller Does Not Activate Trailer Brakes with Brake Pedal on 2003 GMC Sierra 3500
  • There are indeed 2 different brake controller wiring harnesses used between the 2002 and 2003 GMC Sierra. A 2002 would use # 3025-P. The 2003, like you have, uses a # 3015-P. The difference between these 2 harnesses is the way they are pinned out. On # 3025-P the red wire is located next to the white ground wire, and below the black power wire. On # 3015-P the red wire is located next to the blue wire. You will not necessarily need a completely different harness if yours is pinned out
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  • Can a Tonneau Cover be Installed on a 2003 GMC Sierra Short Bed with Over the Rail Bed Liner
  • The Access Tonneau Cover, # A22020219, will not fit with an over the rail drop in bed liner. You would need to remove the portion that goes over the rail (making it and under the rail bed liner) to get a tonneau cover to fit. The best option for a 2003 GMC Sierra with a 6-1/2 foot bed is the Craftec cover, # 251929. You will just need to trim the over the rail bed liner where the unit clamps to the truck as opposed to trimming large portions of it.
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  • Fifth Airborne Air Ride Coupler with Sidewinder for a Leland 7910 Pin Box
  • Since you have a Leland 7910 pin box on your trailer, you can use the 5th Airborne with Sidewinder Premium Fifth Wheel Air-Ride Coupler, # ST400-5AS02, that you have referenced. This model is rated for 19,500 pounds. We also have a 16,000 pound model, # ST400-5AS16K. These units do not come with hardware for mounting. You will need to provide your own hardware. The old hardware should not be used. Make sure to use the same size as the old hardware and that it is grade 5. The units do come
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  • Brake Controller Installation and Troubleshooting on a 2003 GMC Sierra 2500
  • If you have a factory 7-Way trailer connector on your 2003 GMC Sierra 2500 you should be able to use a brake controller adapter, like # 3015-P for Tekonsha brake controllers, to plug your brake controller into the factory brake controller port on your vehicle. The factory port is located in a electrical junction box that is located on the drivers side, below the dash, to the left of the brake pedal. You might want to also check to make sure the blue wire (power wire for 7-Way) and the red wi
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  • Will I Need to Drill Any Holes to Install a Roadmaster Base Plate Kit on a 2003 GMC Z71 Sierra 1500
  • This would be the correct base plate kit for your vehicle. I checked the installation instructions for the Roadmaster XL Base Plate Kit # 199-5 and you will not need to drill any holes into the frame of your 2003 GMC Z71 1500 Sierra. You will utilize existing holes in the frame of your vehicle to install this product. The Stowmaster Tow Bar is designed to work with XL base plates and should work well for you application. I attached an FAQ article on flat towing that you might find informat
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