Trailer Brake Control for 03‑07 GMC Sierra 1500 2500 HD Electric Trailer Brakes Module Box Controller 1‑2 Axle
Model: 74642 3015-10Brake Control Unit
Mounting hardware and bracket
Vehicle specific Plug and Play Wiring Adapter
Fits The Following Vehicles
2003 - 2006 GMC, Sierra 1500 HD, All Styles
2007 GMC, Sierra 1500 HD, (Classic)
2003 - 2006 GMC, Sierra 2500 HD, All Styles
2007 GMC, Sierra 2500 HD, (Classic)
Economical time-based brake control, generates an output signal that increases over a period of time (ramp cycle). It applies braking power at a fixed rate that is NOT proportional to the pressure applied to the brake pedal.
Brake Control Specs:
| Part Number | 74642 |
| Brand | Reese |
| Type | Timed Actuated |
| Axles | 1 to 2 axle trailers |
| Warranty | Lifetime 3 Year warranty |
| Features: | 1 to 2 axle trailers |
| Installation Instructions |  |
2-Plug Wiring Asapter Specs:
| Part Number | 3015 |
| Brand | Tekonsha |
| Warranty | 1 Year |
| Installation Instructions | |
Thank you for choosing Reese made by same people that brought you Tekonsha and Draw-Tite the most powerful manufacturers of electric trailer brake control systems. Manufactured by the same people that brought you Reese, Draw-Tite and Hidden Hitch all of our products come with standard lifetime warranty and support. Our brake controls easily install on your Car Truck Van and SUV. For custom applications on Ford F150 F250 F350 E Series Van Expedition Toyota Tundra Tacoma Chevy Silverado Tahoe GMC Sierra Nissan Titan Frontier please choose one of our 2-Plug wiring adapters recommended below. These adapters will simply plug into the back of the brake control and the other end plugs into a matching plug on your truck. There is no splicing or worry involved, a very easy process. We have adapters for other vehicles as well. The brake control itself always comes with a 1-plug adapter out of the box, which you can splice into any vehicle. Getting a 2plug adapter will only easy your installation and avoid any sort of splicing. All parts in our store are sold at a discount. If you have any questions please do not hesitate to give us a call at 702-374-8999. We will match or beat anyones price.
Partial list of fitment years: 03 04 05 06 07 2003 2004 2005 2006 2007
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Product Details
- Brand: Reese
- Model: 74642 3015-10
- Includes: Brakeman Compact Time-Delay Brake Controller for Trailers with 1-2 Axles, Trailer Brake Controller Custom Harness
Compatibility Chart
Description
Brake Control Unit
Mounting hardware and bracket
Vehicle specific Plug and Play Wiring Adapter
Fits The Following Vehicles
2003 - 2006 GMC, Sierra 1500 HD, All Styles
2007 GMC, Sierra 1500 HD, (Classic)
2003 - 2006 GMC, Sierra 2500 HD, All Styles
2007 GMC, Sierra 2500 HD, (Classic)
Economical time-based brake control, generates an output signal that increases over a period of time (ramp cycle). It applies braking power at a fixed rate that is NOT proportional to the pressure applied to the brake pedal.
Brake Control Specs:
| Part Number | 74642 |
| Brand | Reese |
| Type | Timed Actuated |
| Axles | 1 to 2 axle trailers |
| Warranty | Lifetime 3 Year warranty |
| Features: | 1 to 2 axle trailers |
| Installation Instructions | |
2-Plug Wiring Asapter Specs:
| Part Number | 3015 |
| Brand | Tekonsha |
| Warranty | 1 Year |
| Installation Instructions | |
Thank you for choosing Reese made by same people that brought you Tekonsha and Draw-Tite the most powerful manufacturers of electric trailer brake control systems. Manufactured by the same people that brought you Reese, Draw-Tite and Hidden Hitch all of our products come with standard lifetime warranty and support. Our brake controls easily install on your Car Truck Van and SUV. For custom applications on Ford F150 F250 F350 E Series Van Expedition Toyota Tundra Tacoma Chevy Silverado Tahoe GMC Sierra Nissan Titan Frontier please choose one of our 2-Plug wiring adapters recommended below. These adapters will simply plug into the back of the brake control and the other end plugs into a matching plug on your truck. There is no splicing or worry involved, a very easy process. We have adapters for other vehicles as well. The brake control itself always comes with a 1-plug adapter out of the box, which you can splice into any vehicle. Getting a 2plug adapter will only easy your installation and avoid any sort of splicing. All parts in our store are sold at a discount. If you have any questions please do not hesitate to give us a call at 702-374-8999. We will match or beat anyones price.
Partial list of fitment years: 03 04 05 06 07 2003 2004 2005 2006 2007
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Trailer Brake Control for 03-07 GMC Sierra 1500 2500 HD Electric Trailer Brakes Module Box Controller 1-2 Axle Install Notes
Installation Instructions for Electric Trailer Brake Control Wiring Adapter
Part Number: 301500
Tools Required:
- None
Step-by-Step Instructions:
Step 1: Locate the Vehicle’s Electric Junction Box
- Find the black Electric Junction Box inside the vehicle:
- Under the dashboard, left of the steering column, just above the carpet.
- Remove the cover of the Electric Junction Box.
- Locate the connection point for the electric trailer brakes in the top row, second slot from the left.
Step 2: Plug the Brake Control Adapter into the Vehicle Connector
- Plug the brake control adapter into the mating connection point inside the Electric Junction Box.
- Use a circuit tester to verify that battery (+) power is supplied to the adapter.
NOTE:
- Not all vehicles are pre-wired with complete power connections to the battery and/or wiring for electric trailer brakes.
- If power is already supplied, skip to Step 4.
Step 3: Add Power Supply (If Required)
For vehicles with no power supply:
-
Use an Electric Brake Control Wiring Kit and route all wires as described in the wiring kit instructions or as follows:
A. Vehicle Brake Control Feed Wire (Blue):
- Open the vehicle’s hood and locate the black Electrical Center Box on the driver’s side.
- Remove the cover to access the blue brake control feed wire.
- This step may require temporarily removing the vehicle’s support brace.
B. Vehicle Battery (+) Power Supply Wire (Red):
- Locate the red battery (+) power supply wire in the Electrical Center Box.
- Connect the wiring and ensure an in-line fuse or circuit breaker is installed.
- Reinstall the Electrical Center Box cover, lid, and support brace.
Step 4: Connect the Brake Controller
- Plug the brake control adapter into the vehicle’s brake control harness connector.
- Follow the brake control manufacturer’s instructions for wiring and mounting the unit.
Warnings:
- Complete the installation following the brake control manufacturer’s instructions.
- Mount the brake controller securely as directed.
- Perform all test procedures outlined in the brake controller manual.
- Do NOT overload the circuit:
- Maximum capacity: 4 axles / 8 brakes (24 amps)
- Always follow the vehicle manufacturer’s towing and load limits.
Wiring Overview:
- Blue Wire: Brake control feed wire (output to trailer brakes)
- Red Wire: Battery (+) power supply
- Ground: Connects brake controller to vehicle ground
- Stop Lamp Switch (Input): Vehicle braking signal to the brake controller
Final Notes:
- Periodically inspect the connections for tightness and wear.
- Ensure all wires are properly routed away from sharp edges, heat sources, and pinch points.
- Consult the vehicle owner’s manual for additional information regarding towing and electrical connections.
End of Instructions
Installation Instructions for Electric Trailer Brake Control Wiring Adapter
Part Number: 301500
Tools Required:
- None
Step-by-Step Instructions:
Step 1: Locate the Vehicle’s Electric Junction Box
- Find the black Electric Junction Box inside the vehicle:
- Under the dashboard, left of the steering column, just above the carpet.
- Remove the cover of the Electric Junction Box.
- Locate the connection point for the electric trailer brakes in the top row, second slot from the left.
Step 2: Plug the Brake Control Adapter into the Vehicle Connector
- Plug the brake control adapter into the mating connection point inside the Electric Junction Box.
- Use a circuit tester to verify that battery (+) power is supplied to the adapter.
NOTE:
- Not all vehicles are pre-wired with complete power connections to the battery and/or wiring for electric trailer brakes.
- If power is already supplied, skip to Step 4.
Step 3: Add Power Supply (If Required)
For vehicles with no power supply:
-
Use an Electric Brake Control Wiring Kit and route all wires as described in the wiring kit instructions or as follows:
A. Vehicle Brake Control Feed Wire (Blue):
- Open the vehicle’s hood and locate the black Electrical Center Box on the driver’s side.
- Remove the cover to access the blue brake control feed wire.
- This step may require temporarily removing the vehicle’s support brace.
B. Vehicle Battery (+) Power Supply Wire (Red):
- Locate the red battery (+) power supply wire in the Electrical Center Box.
- Connect the wiring and ensure an in-line fuse or circuit breaker is installed.
- Reinstall the Electrical Center Box cover, lid, and support brace.
Step 4: Connect the Brake Controller
- Plug the brake control adapter into the vehicle’s brake control harness connector.
- Follow the brake control manufacturer’s instructions for wiring and mounting the unit.
Warnings:
- Complete the installation following the brake control manufacturer’s instructions.
- Mount the brake controller securely as directed.
- Perform all test procedures outlined in the brake controller manual.
- Do NOT overload the circuit:
- Maximum capacity: 4 axles / 8 brakes (24 amps)
- Always follow the vehicle manufacturer’s towing and load limits.
Wiring Overview:
- Blue Wire: Brake control feed wire (output to trailer brakes)
- Red Wire: Battery (+) power supply
- Ground: Connects brake controller to vehicle ground
- Stop Lamp Switch (Input): Vehicle braking signal to the brake controller
Final Notes:
- Periodically inspect the connections for tightness and wear.
- Ensure all wires are properly routed away from sharp edges, heat sources, and pinch points.
- Consult the vehicle owner’s manual for additional information regarding towing and electrical connections.
Attention:
This is a summary of the installation procedure. For complete installation instructions, including diagrams and detailed information from the manufacturer, please download the full installation PDF.
For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
Installation Instructions for Electronic Brake Control (2 & 4 Brake Systems)
Product Information:
- Part Number: N74642
Tools Required:
- Drill with 1/8" drill bit
- Screwdriver or 1/4" Nut Driver
- Wire Cutter/Stripper
- Wire Crimping Tool
- Circuit Tester
Package Contents:
- Brake Control Unit
- Mounting Bracket
- Mounting Screws (#6 x 3/8") (Qty: 4)
- Wire Tap Connector
Mounting Instructions:
-
Select a Mounting Location:
- Choose a solid surface within easy reach of the driver.
- Ensure the area behind the mounting panel is clear before drilling.
-
Mark and Drill Holes:
- Hold the mounting bracket in position and mark the hole locations.
- Drill two 1/8" holes at the marked points.
-
Secure the Bracket:
- Attach the bracket using two self-tapping screws provided.
-
Install the Brake Control Unit:
- Slide the Brake Control into the bracket.
- Adjust to the desired position and secure it with the remaining screws.
Wiring Instructions:
- Black Wire: Connect to the 12V positive battery terminal using a 20A auto-reset circuit breaker.
- White Wire: Connect to a clean, bare metal ground on the vehicle chassis.
- Red Wire: Connect to the cold side of the stoplight switch (active only when the brake pedal is pressed).
- Blue Wire: Connect to the trailer brake wire at the 7-way trailer connector.
Setup and Adjustment:
-
Preliminary Settings:
- Set the Sync Control midway between "+" and "-".
- Set the Output Control to its lowest setting (fully to the right).
-
Test Braking Performance:
- Slowly roll forward and press the brake pedal.
- Adjust the Output Control to the left until the trailer brakes apply firmly.
- If trailer brakes lock up or jerk, adjust the Output Control slightly back to the right.
-
Fine-Tuning Sync Control:
- Adjust the Sync Control toward "+" for more aggressive braking or "-" for less aggressive braking.
- Test drive to ensure stops are smooth and firm.
Controls Overview:
- Output Control: Sets the maximum braking power delivered to the trailer brakes.
- Sync Control: Adjusts the delay/aggressiveness of trailer braking relative to vehicle braking.
- Manual Control: Located on the front-right of the unit; applies trailer brakes independently of the tow vehicle.
Troubleshooting Guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No trailer brakes | Poor wiring connection | Check Black and Blue wire connections. |
| Weak trailer braking | Output too low | Adjust the Output Control upward. |
| Brakes lock up | Output too high | Adjust the Output Control downward. |
| Delayed braking | Sync set too low | Increase Sync toward "+". |
| Overly aggressive braking | Sync set too high | Decrease Sync toward "-". |
| No stoplight response | Faulty Red wire connection | Verify stoplight switch connection. |
Safety Notes:
- Periodically inspect all wiring for damage and ensure proper connections.
- Do not reverse Black (Battery) and White (Ground) wire connections as it will damage the unit.
- Test the trailer brake control system before each trip to ensure proper operation.
Technical Support:
For technical support and assistance, our team of experts is available to help. You can reach our tech support by visiting www.trailerjacks.com or calling 877-869-6690.
Warning: Never exceed the manufacturer’s towing or load recommendations. Improper adjustment may result in braking failure or loss of control.
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