Reese Pilot Trailer Brake Control for 03‑06 Chevy Suburban 1500 2500 Electric Trailer Brakes Module Box Controller 1‑3 Axle
Model: 74378 3015-3Brake Control Unit
Mounting hardware and bracket
Vehicle specific Plug and Play Wiring Adapter
Fits The Following Vehicles
2003 - 2006 Chevrolet, Suburban 1500, All Styles
2003 - 2006 Chevrolet, Suburban 2500, All Styles
Brake Control Specs:
| Part Number | 74378 |
| Brand | Reese |
| Type | Timed Actuated |
| Axles | 1 to 3 axle trailers |
| Warranty | Limited Lifetime |
| Features: | Large easy to read dual digital display shows: Properly wired control Voltage output to brakes (vs. a percentage) Connection to trailer Protection against short circuit/loss of ground For use on any 12 volt negative ground system |
| Installation Instructions |  |
2-Plug Wiring Adapter 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 2003 2004 2005 2006
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Product Details
- Brand: Reese
- Model: 74378 3015-3
- Includes: Pilot Trailer Time-Delay Brake Controller for Trailers with 1-3 Axles, Trailer Brake Controller Custom Harness
Compatibility Chart
Brake Control Unit
Mounting hardware and bracket
Vehicle specific Plug and Play Wiring Adapter
Fits The Following Vehicles
2003 - 2006 Chevrolet, Suburban 1500, All Styles
2003 - 2006 Chevrolet, Suburban 2500, All Styles
Brake Control Specs:
| Part Number | 74378 |
| Brand | Reese |
| Type | Timed Actuated |
| Axles | 1 to 3 axle trailers |
| Warranty | Limited Lifetime |
| Features: | Large easy to read dual digital display shows: Properly wired control Voltage output to brakes (vs. a percentage) Connection to trailer Protection against short circuit/loss of ground For use on any 12 volt negative ground system |
| Installation Instructions | |
2-Plug Wiring Adapter 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 2003 2004 2005 2006
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Reese Pilot Trailer Brake Control for 03-06 Chevy Suburban 1500 2500 Electric Trailer Brakes Module Box Controller 1-3 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
Product Information:
- Model: Brake Control for 2 to 6 Brake Applications
- Part Number: N74378
Tools Required:
- Screwdriver
- Drill with 1/8" Drill Bit
- Wire Stripper/Cutter
- Crimping Tool
Components Included:
- Brake Control Unit
- Mounting Bracket
- Mounting Screws (#6 x 3/8") (Qty: 4)
Mounting Instructions:
-
Select Mounting Location:
- Choose a solid surface within easy reach of the driver.
- Ensure no wires or components are behind the mounting area.
-
Attach the Mounting Bracket:
- Place the bracket and mark the holes using the mounting bracket slots as a guide.
- Drill two 1/8" holes at the marked points.
- Secure the bracket with #6 x 3/8" screws.
-
Install the Brake Control:
- Slide the Brake Control into the bracket.
- Adjust to the desired position and secure it by tightening the screws.
Wiring Instructions:
- Black Wire: Connect to the 12V positive battery terminal using a 30A circuit breaker.
- White Wire: Connect to a clean, bare metal ground.
- Red Wire: Connect to the cold side of the stoplight switch (voltage present only when the brake pedal is pressed).
- Blue Wire: Connect to the trailer brake wire at the 7-way trailer connector.
Setting Power to Trailer Brakes:
- Connect the trailer to the tow vehicle.
- Locate the Manual Slide Knob and Power Knob on the Brake Control.
- Apply the Manual Slide Knob and turn the Power Knob until the display reads 4.0.
- Drive at 25 mph on a dry, level surface and apply the Manual Slide Knob:
- If brakes lock up: Reduce the power setting.
- If braking is insufficient: Increase the power setting.
- Repeat the test until braking is smooth, without wheel lock-up.
Adjusting Display Orientation:
To reverse the display from upside down to right side up:
- Disconnect the Black Wire (battery connection) from the tow vehicle.
- Wait 5 seconds.
- Reconnect the Black Wire.
- Do not press the brake pedal or Manual Slide Knob while reconnecting.
Important Notes:
- Always warm trailer brakes by driving 1/4 mile at 45 mph while applying a low brake level.
- Do not exceed power settings that lock up the trailer brakes. Wheel skidding can cause loss of vehicle control.
- Adjust power settings for different loads or road conditions.
Troubleshooting:
| Issue | Probable Cause | Solution |
|---|---|---|
| No display when connected to power | Poor connection (Black or White wires) | Check wiring connections and ground. |
| Trailer brakes are too aggressive | Power set too high | Reduce power using Power Knob. |
| Braking is weak or insufficient | Power set too low or poor connections | Increase power; check Blue wire. |
| Display shows "0.0" when activated | Poor trailer connection or wiring issue | Inspect trailer connector and wiring. |
Safety Notes:
- Disconnect the trailer plug before testing the breakaway switch. Failure to do so may damage the Brake Control.
- Regularly inspect trailer brakes and connections 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: Do not exceed the vehicle's Gross Combined Weight Rating (GCWR) as recommended by the manufacturer.
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