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2003 - 2006 Chevrolet Silverado 1500 HD
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Always the correct part
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Always the correct part
We know our products
Quality Products
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Includes mounting hardware
Limited lifetime warranty
Includes mounting hardware & Plug & Play Harness
Finish: Blank
Installation Difficulty: Novice
Installation Time Exact (Minutes): 20
Experience highly responsive and smooth stops with the TriFlex NEXT brake controller. Equipped with a triple-axis, motion-sensing accelerometer, it ensures precise braking performance. The third axis dynamically adjusts power when navigating uphill or downhill terrains, further enhancing control. Enjoy the convenience of automatic leveling and calibration, eliminating the need for setup and providing peace of mind on the road. Built-in reverse-polarity and short-circuit protection add an extra layer of safety during towing. Stay informed about your tow vehicle's voltage and trailer disconnect status through the convenient indicators. The clean and user-friendly interface offers a full-text readout and troubleshooting capabilities, simplifying operation and maintenance. The TriFlex NEXT brake controller offers exceptional control over 2-8 trailer brakes at a time (1-4 axles). Its adjustable settings effortlessly adapt to your unique vehicle-trailer configuration. Compatible with low-volt, PWM, ABS, and cruise control, its slim profile combines functionality with a modern aesthetic. Monitor your brake settings at a glance using the LED display that showcases power adjustments in 0.5 increments. The display also provides full-text diagnostics for easy troubleshooting. Adjust the brightness to ensure optimal visibility during day or night towing. Fine-tune your towing experience with the TriFlex NEXT proportional brake controller. It offers fully adjustable power and ramp time, allowing you to customize the settings according to your specific needs. Choose from 10 gain settings and nine load settings to achieve precise control. The LED screen clearly displays the ramp-up progress, and the brightness can be adjusted to match daytime or nighttime towing conditions. With versatile mounting options, you can install the controller anywhere in your vehicle at any desired angle.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
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1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2003 - 2006 | Chevrolet Silverado 1500 HD | — |
Yes, the 2003-2006 Chevrolet Silverado 1500 HD CURT TriFlex NEXT Proportional Motion-Sensing Trailer Brake Controller for 1-4 Axles #51146 (Part #CURTBC1268) is designed to fit the 2003-2006 Chevrolet Silverado 1500 HD.
The 2003-2006 Chevrolet Silverado 1500 HD CURT TriFlex NEXT Proportional Motion-Sensing Trailer Brake Controller for 1-4 Axles #51146 (Part #CURTBC1268) fits the following vehicles: 2003-2006 Chevrolet Silverado 1500 HD. Always verify your specific year, make, and model before ordering.
The 2003-2006 Chevrolet Silverado 1500 HD CURT TriFlex NEXT Proportional Motion-Sensing Trailer Brake Controller for 1-4 Axles #51146 (Part #CURTBC1268) fits 2003-2006 Chevrolet Silverado 1500 HD models. The 2006 model year is the last year covered by this part number. For newer models, check for an updated version.
The 2003-2006 Chevrolet Silverado 1500 HD CURT TriFlex NEXT Proportional Motion-Sensing Trailer Brake Controller for 1-4 Axles #51146 (Part #CURTBC1268) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
Yes, the CURT brake control harness (51352 and 51353) is compatible with Chevrolet Silverado and Chevrolet Silverado Classic. However, the manual does not specify model years, so contact CURT Manufacturing at 1.877.287.8634 to confirm your specific year and configuration are covered.
Yes, the CURT brake control harness (51352 and 51353) is compatible with both GMC Sierra and GMC Sierra Classic models. The manual lists both as separate applications, indicating support for both standard and classic versions.
Yes, the CURT brake control harness (51352 and 51353) is compatible with Cadillac Escalade, including the EXT and ESV variants.
Yes, the CURT brake control harness (51352 and 51353) is compatible with Hummer H2.
The black electrical junction box is located under the dash, to the left of the steering column. The vehicle connection point is in the top row of the junction box, second from the left.
1. Locate the black electrical junction box under the dash, left of the steering column. 2. Remove the box cover. 3. Insert the connector on the CURT brake control harness into the vehicle connection point in the top row, second from the left. 4. Verify battery power is supplied using a circuit tester by carefully probing the connector. 5. Ensure no wires are touching. 6. If power is confirmed, proceed to connecting the black connector to the brake control unit's quick plug connector.
After inserting the connector into the vehicle connection point in the junction box, carefully probe the connector with a circuit tester to verify battery power (+) is supplied to the brake control harness. Make sure no wires are touching during this test.
The manual specifies a circuit tester is needed to verify battery power. Cable ties are provided with the harness for securing it. The manual does not list other required tools.
If the circuit tester shows no battery power at the connector, you will need to install a universal brake control wiring kit (#51500). This kit must be installed according to its own instruction manual. The factory harness will need to be modified: cut the battery wire and trailer brake wire leading to the factory connector, leaving enough room to use butt connectors to attach the wires from the universal kit. After installation, cap and/or tape the exposed ends of cut wires to prevent shorting.
Wire cutting is only required if your vehicle does not supply power to the factory connector and you need to install the universal brake control wiring kit (#51500). In that case, you must cut the battery wire and trailer brake wire leading to the factory connector, leaving enough room to attach butt connectors to the wires from the universal kit. If your vehicle supplies power to the factory connector, no cutting is needed.
Ensure no wires are touching when inserting the connector into the junction box. If you cut wires to install the universal brake control wiring kit, cap and/or tape the exposed ends of cut wires to prevent shorting. Secure the brake control harness with provided cable ties, avoiding any pinch points. All steps must be followed to ensure the harness functions properly.
Secure the brake control harness with the provided cable ties, avoiding any pinch points. This prevents the harness from moving or becoming damaged during vehicle operation.
After completing the installation, test for proper function by following the brake control unit instruction manual. Mount the unit as directed in the brake control user manual and perform the test procedures specified in that manual.
The CURT brake control harness includes the harness itself with connectors and cable ties for securing it. The manual does not provide a detailed parts list beyond these items.
The harness fits Cadillac Escalade (EXT/ESV), Chevrolet Avalanche/Silverado/Silverado Classic/Suburban/Tahoe, GMC Sierra/Sierra Classic/Yukon/Yukon Denali/Yukon XL/Yukon XL Denali, and Hummer H2. Contact CURT at 1.877.287.8634 to confirm your specific model year.
You need a circuit tester to verify battery power. Cable ties are provided with the harness. If your vehicle lacks factory power to the connector, you will also need the universal brake control wiring kit (#51500) and butt connectors.
No drilling is required. Wire cutting is only necessary if your vehicle does not supply power to the factory connector and you install the universal brake control wiring kit (#51500).
If the circuit tester shows no battery power, install the universal brake control wiring kit (#51500) per its instructions. You will need to cut and splice the battery and trailer brake wires using butt connectors, then cap/tape all exposed wire ends to prevent shorting.
Ensure no wires touch when inserting the connector. If cutting wires, cap and tape all exposed ends to prevent shorting. Secure the harness with cable ties, avoiding pinch points. Follow all steps in the manual to ensure proper function.
After installation, test for proper function using the brake control unit instruction manual. Mount the unit as directed and perform all test procedures specified in the brake control user manual.
The TriFlex™ NEXT (part number 51146) is a proportional brake controller that manages trailer braking in response to tow vehicle braking. It uses sensors to detect vehicle deceleration and applies proportional power to trailer brakes based on gain and load settings. It features a manual override control for independent trailer braking, an LED display showing output power (0.5 to 9.9 scale), and adjustable brightness. The controller mounts inside the tow vehicle cab and connects to the trailer via the vehicle's brake plug.
If your vehicle has a factory-equipped brake controller or integrated trailer brake control (ITBC), you must consult your vehicle's owner's manual for any necessary installation instructions before proceeding. Removal of factory-equipped brake controls may require a dealer to service the harness for it to function properly. Splice-in harnesses may void the warranty. Contact CURT product support at 877.287.8634 or check the CURT catalog for your specific vehicle application.
Three options are available: (1) CURT custom vehicle-specific harness (check CURT catalog for your vehicle), (2) CURT quick plug with pigtails (#51515 or #51516), or (3) CURT universal brake control wiring kit (#51500) for vehicles without a factory brake control plug. Most trucks and utility vehicles have a factory plug that allows quick installation. Check your vehicle owner's manual for plug availability and location. Removal of factory quick plugs can void the warranty.
The following tools are required: (1) drill, (2) 1/8" drill bit, (3) Phillips screwdriver, and (4) pry tool. These are used for drilling mounting holes through the adhesive pad, installing mounting screws, and removing anti-rattle foam from the vehicle plug.
The package includes: (1) main module with CURT quickplug, (2) mounting bracket, (3) mounting screws, (4) base plate adhesive pad, and (5) cable ties. Additional wiring components (harness, connectors, circuit breaker) must be sourced separately depending on your vehicle type.
Yes. Disconnect the tow vehicle's negative battery terminal from its battery post before beginning the installation process. This is a critical safety step to prevent electrical damage and ensure safe wiring connections.
The main module's positive wire (with 30-amp circuit breaker) and ground wire must be connected directly to the tow vehicle's battery using a minimum of 10-gauge stranded wire. The 30-amp auto-reset circuit breaker must be mounted as close to the battery as possible. Connecting to existing wiring or an alternate ground may damage the vehicle's circuits, lead to failure of the brake control module, loss of trailer brakes, or vehicle fire. Do not connect to existing wiring under any circumstances.
Use the following: (1) black wire (10-gauge) from battery positive to 30-amp circuit breaker 'AUX' side, then to brake controller black wire via 10/12-gauge butt connector; (2) white wire (10-gauge) from battery area to brake controller white wire via 10/12-gauge butt connector; (3) blue wire (10-gauge) from tow vehicle trailer plug 'BRAKE' terminal to brake controller blue wire via 10/12-gauge butt connector. All connections to the battery must use 10-gauge stranded wire minimum.
Route the harness into the dash area, making sure it is out of the way of any moving parts. Secure the harness with the provided cable ties. When passing wires through sheet metal, always use an existing grommet. If there is no grommet, install one or use silicone sealant to protect the wires from sharp edges. Check that foot controls are unobstructed by the harness.
Drilling is optional. The mounting bracket uses a double-sided adhesive pad for primary mounting. If you choose to add screw reinforcement (optional), use a 1/8" diameter drill bit to drill holes through the adhesive pad to mark the mounting surface. Verify that mounting screws will not interfere with anything on the back side of the dash before drilling. Tighten screws carefully to avoid stripping the holes.
1. Select a solid, easily accessible location behind the steering wheel. The mounting angle does not affect operation. 2. Hold the mounting bracket in position and mark hole locations. Verify screws will not interfere with the back side of the dash. 3. Peel one release liner from the double-sided adhesive pad and stick it to the bracket. 4. (Optional) Drill 1/8" holes through the adhesive pad to see marked locations. 5. Remove the second release liner and firmly press the mount to the dash. 6. (Optional) Install and tighten mounting screws carefully without over-tightening. 7. Slide the controller onto the mount until it locks into place; you will hear a clicking noise when correctly installed.
1. Determine the harness style needed (custom vehicle harness or universal splice-in). 2. Locate the vehicle plug, remove anti-rattle foam, remove dust cover, and connect the CURT harness. 3. Route the harness into the dash area, securing with cable ties, ensuring foot controls are unobstructed. 4. Plug the harness into the brake controller. Note: Some controllers start immediately; others require the vehicle to be in run position or running to power up. The display may remain blank until manual control, adjustment buttons, or brake pedal are used.
Mount the 30-amp auto-reset circuit breaker as close to the battery as possible. This is a critical safety requirement to protect the vehicle's electrical system and prevent damage to the brake controller.
Disconnect the electrical plug between the trailer and tow vehicle before testing a breakaway switch. Failure to disconnect may damage the brake control unit.
Avoid mounting the brake control module near a CB radio or other RF (radio frequency) transmitter, as this can interfere with controller operation.
1. Complete all electrical connections inside the vehicle. 2. Start the vehicle on a level surface to allow the controller to calibrate. 3. Plug the trailer electrical connector into the tow vehicle plug. 4. The brake controller will sense the trailer within 10-15 seconds of connection. 5. Upon connecting and applying brakes, the controller senses the trailer immediately. 6. Every vehicle start triggers a restart and calibration display. Once the display becomes blank/black, it remains so until manual control is applied, adjustment buttons are pressed, or the brake pedal is applied. 7. Make preliminary gain and load adjustments with the trailer connected and engine running to ensure proper charge voltage.
1. Locate a vacant area on a dry, level paved surface. 2. Starting with gain adjustment, drive forward at approximately 25 mph and apply vehicle brakes. If trailer braking is insufficient, adjust gain using the silver mode button and black rocker button. If trailer brakes lock up, decrease output using the lower black rocker button. Repeat until stops are firm, just short of trailer wheel lock-up. 3. Once gain is set, adjust load by driving at 25 mph and pressing the brake pedal. The vehicle and trailer should make smooth stops. If the stop is slow, increase load aggressiveness using the upper rocker button. If too aggressive, decrease using the lower rocker button. 4. Make several stops at various speeds and adjust load until stops are smooth and firm. Slight gain adjustment may also be needed. 5. Repeat this process for any weather, weight, or loading changes.
Make preliminary gain and load adjustments with the trailer connected and engine running to ensure proper charge voltage. Gain adjustments establish the maximum power available to trailer brakes. Load adjustments control trailer brake aggressiveness. These adjustments should only be made while stopped, with transmission in park or neutral, parking brake applied, foot off the brake pedal, and no manual override actuation. The screen will enter sleep mode 5 seconds after adjustments are made. Repeat adjustments for any weather, weight, or loading changes.
To recalibrate, turn off the vehicle and restart it, or disconnect and reconnect the connector between the controller and the vehicle. Be sure the controller is in its mounting location and on a flat, level surface when restoring connection. The controller uses components that detect movement and angles to power the trailer brakes, so proper positioning is essential. Calibration occurs automatically at vehicle startup and when the brake controller is connected to a power source.
Yes. The brake controller will retain the last settings applied upon restarting. Every time the vehicle starts, power is applied to the brake controller and it will restart, displaying the startup icon on the display. Once the display becomes blank/black, it remains so until manual control is applied, adjustment buttons are pressed, or the brake pedal is applied.
The 'Not Connected' indicator means the controller has recognized a trailer connection but the brakes are being applied with no trailer actually connected. This can also indicate the red wire is connected to the wrong side of the stoplight switch or to an incorrect wire. Check and repair the wiring connections according to the Wiring section of the manual.
If the display does not light up when the brake pedal or manual control is used, the problem is likely no power to the controller, no ground, reversed black and white wires, or a blown circuit breaker. Check and repair all connections according to the Wiring section of the manual. Verify the 30-amp circuit breaker is functioning and properly connected to the battery.
The 'Low Volt' indicator shows that the tow vehicle's system voltage is low. This can occur with or without the trailer connected. The brake controller is not receiving enough voltage to provide the trailer with the needed voltage at the current controller settings. Check the tow vehicle's battery and charging system. Service is needed to restore proper voltage.
When the 'Short' indicator appears during manual control use, the red wire is likely connected to the ground side of the stoplight switch or is shorted to ground. Check the brake control wiring carefully. The issue may require changing the switch setting. Refer to the Manual Control section of the manual for proper wiring configuration.
The 'Overload' indicator shows the brake control is in an overload or short-circuit condition. When appearing during brake pedal or manual override use, it indicates a short in the blue wire output circuit or trailer plug. Locate and correct the short in the wiring. If the indicator appears when the brake pedal is pressed with no trailer connected, the trailer brake wire may be grounded to the trailer and service is needed.
Multiple causes are possible: (1) Short or overload in trailer brakes—troubleshoot the trailer brake circuit according to the brake manufacturer's instructions. (2) Short to trailer brakes in wiring or brake assembly—check for shorts in wiring and each electric brake; you may see or hear sparking. (3) Electrical connection failed—check the connector for fit and blockages. (4) Loss of trailer connection—stop and check the trailer connector. (5) No connection between brake controller and trailer brakes (blue wire circuit)—confirm connection to trailer, confirm connector terminal positions, and check the trailer. Refer to the Troubleshooting Guide for detailed steps.
The 'Disconnected' indicator (flashing) means the trailer has been disconnected. If the indicator is on while the brake pedal is pushed, it means brakes are being applied with no trailer connected. Stop the vehicle and check the trailer connector. Ensure the trailer is properly connected to the tow vehicle plug.
The 'Reconnect' indicator means the trailer needs to be disconnected and reconnected to function correctly. Unplug the trailer connector from the tow vehicle plug and then reconnect it. This resets the controller's connection to the trailer.
The TriFlex™ NEXT works with most tow vehicles equipped with a factory brake control plug. Check your vehicle owner's manual for plug availability. If your vehicle has a factory brake controller or integrated trailer brake control (ITBC), consult the owner's manual for installation instructions. For vehicles without a factory plug, use the CURT universal brake control wiring kit (#51500). Contact CURT at 877.287.8634 for your specific vehicle application.
You need: drill, 1/8" drill bit, Phillips screwdriver, and pry tool. Additional wiring components (harness, connectors, 30-amp circuit breaker) depend on your vehicle type.
Yes, disconnect the negative battery terminal before installation. This is essential for safety and to prevent electrical damage.
No, drilling is optional. The bracket uses a double-sided adhesive pad for mounting. Drilling with a 1/8" bit is only needed if you choose to add screw reinforcement.
Use minimum 10-gauge stranded wire for both the positive (black) and ground (white) connections directly to the vehicle battery. The 30-amp circuit breaker must be mounted as close to the battery as possible. Never connect to existing wiring.
Connect the positive and ground wires directly to the vehicle battery using 10-gauge stranded wire with a 30-amp circuit breaker mounted as close to the battery as possible. Never connect to existing wiring or alternate grounds, as this can cause vehicle fire, loss of brakes, or controller failure.
After mounting, slide the controller onto the bracket until it locks into place; you will hear a clicking noise. The display should light up when the brake pedal or manual control is used. Complete initial setup on a level surface with the trailer connected and engine running, then perform a test drive at 25 mph to verify smooth, firm braking without wheel lock-up.
Symptom: No display illumination. Possible causes: (1) No power to controller, (2) no ground connection, (3) reversed black and white wires, or (4) blown 30-amp circuit breaker. Corrective action: Check and repair all connections according to the Wiring section. Verify the circuit breaker is functioning and properly connected to the battery. Ensure black and white wires are correctly connected to their respective battery terminals.
Symptom: 'Low Volt' indicator displayed. Cause: Tow vehicle's system voltage is low; the brake controller is not receiving enough voltage to provide proper trailer braking at the current settings. Corrective action: Check the tow vehicle's battery condition and charging system. Have the battery and alternator tested. Ensure all battery connections are clean and tight.
Symptom: 'Short' indicator appears during manual control use. Cause: Red wire is connected to the ground side of the stoplight switch or is shorted to ground. Corrective action: Check the brake control wiring carefully. Verify the red wire is connected to the correct side of the stoplight switch. The issue may require changing the switch setting. Refer to the Manual Control section for proper wiring configuration.
Symptom: 'Overload' indicator displayed during braking. Cause: Short in the blue wire output circuit or trailer plug. Corrective action: Locate and correct the short in the wiring. Inspect the blue wire from the controller to the trailer plug for damage or exposed conductors. Check the trailer plug connectors for corrosion or poor contact. If the indicator appears with no trailer connected, the trailer brake wire may be grounded to the trailer frame.
Symptom: 'Disconnected' indicator flashing. Cause: Trailer has been disconnected from the tow vehicle. Corrective action: Stop the vehicle and check the trailer connector. Ensure the trailer electrical connector is fully seated in the tow vehicle plug. Reconnect if necessary. If the indicator remains on while the brake pedal is pressed, it means brakes are being applied with no trailer connected.
Symptom: 'Reconnect' indicator displayed. Cause: Trailer needs to be disconnected and reconnected to function correctly. Corrective action: Unplug the trailer electrical connector from the tow vehicle plug completely, then reconnect it firmly. This resets the controller's connection to the trailer. The display should clear once the trailer is properly reconnected.
Symptom: 'Not Connected' indicator displayed. Cause: Red wire is connected to the wrong side of the stoplight switch or to an incorrect wire. Corrective action: Check and repair the wiring connections according to the Wiring section of the manual. Verify the red brake signal wire is connected to the correct terminal of the stoplight switch. Consult the wiring diagram on page 5 for proper routing.
Symptom: Display is blank/black with no response. Cause: Inadequate battery or ground wiring to the brake controller. Corrective action: Check the brake controller wiring, particularly the black (battery positive) and white (ground) connections. Verify both wires are 10-gauge stranded wire and connected directly to the vehicle battery. Check for loose connections, corrosion, or damaged wire insulation. Ensure the 30-amp circuit breaker is functioning.
Symptom: No trailer braking; 'Not Connected' indicator displayed. Cause: No connection between brake controller and trailer brakes (blue wire circuit). Corrective action: (1) Confirm the blue wire is connected from the controller to the trailer plug 'BRAKE' terminal. (2) Confirm connector terminal positions are correct. (3) Check the trailer brake system for proper operation. (4) Verify the trailer is properly connected to the tow vehicle. Inspect the blue wire for damage or loose connections.
Symptom: Trailer brakes function but error indicator is shown. Cause: Miswired trailer, wiring short, or burnt-out bulb. Corrective action: (1) Check all bulbs in the trailer lighting system for burnt-out bulbs. (2) Check for possible shorts in the wiring, particularly the blue output wire and red brake signal wire. (3) Inspect the trailer wiring for damage or exposed conductors. (4) Verify all connectors are properly seated and free of corrosion.
Symptom: No trailer braking; suspected short in brake system. Cause: Short or overload in trailer brakes, or short to trailer brakes in wiring or brake assembly. Corrective action: (1) Check for shorts in the wiring and in each electric brake. (2) You may see or hear the wiring sparking if there is a short. (3) Troubleshoot the trailer brake circuit according to the brake manufacturer's instructions. (4) Inspect each brake unit for internal shorts or damage. (5) Check the blue output wire from the controller to the trailer for damage or exposed conductors.
Symptom: No trailer braking; loose or poor connector fit. Cause: Electrical connection failed; connector blockage or poor fit. Corrective action: (1) Unplug the trailer connector from the tow vehicle plug. (2) Inspect both the male and female connector terminals for corrosion, debris, or damage. (3) Clean the connectors if necessary. (4) Check for any blockages inside the connector housing. (5) Firmly reconnect the trailer connector, ensuring it seats completely. (6) Test the brakes again.
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