Installation Instructions for GMC Sierra/Chevrolet Silverado 2500 & 3500 HD Pickups
(Includes Regular, Crew, Extended, Dually, 2WD & 4WD - Long & Short Bed Models)

Part Numbers:

• 75707
• 87602
• 44653
• 75501

Tools Required:

• Wrenches: 13mm, 21mm, 22mm, 3/4”, 7/8”
• Drill Bits: None
• Additional Tools: Plastic cutting tool (short-bed trucks as needed)

Wiring Access Location:

• PU3

Step-by-Step Instructions:

General:

1. Lower Spare Tire:

   • For ease of installation, lower the spare tire and set aside.

2. Remove Existing Bolts:

   • Remove the existing 14mm bolts from the end of the truck’s frame rails. Return the bolts to the vehicle owner.
   • If the truck has an existing hitch, remove the bumper bolts as well.

Short-Bed Trucks:

3. Remove Heat Shield Bolt:

   • Remove the rearmost 8mm bolt securing the plastic heat shield to the passenger side frame.

4. Attach Bolt-On Brackets:

   • Attach the supplied bolt-on brackets to the hitch brackets. Torque the fasteners as specified below.

5. Sandwich Plastic Heat Shield:

   • Position the heat shield tab between the hitch and the frame on the passenger side. Trim the heat shield gusset if necessary to ensure it remains in place.

Long-Bed Trucks:

6. Discard Bolt-On Brackets:
   • Discard the bolt-on brackets or return them to the vehicle owner, as they are unnecessary for long-bed applications.

All Models:

7. Position Hitch:

   • Raise the hitch into position. Align the hitch slots with the weldnuts in the truck bumper and frame rails.

8. Install Fasteners:

   • Use the supplied M14 bolts and conical washers for the bumper weldnuts.
   • For forward attachments, insert carriage bolts and blocks through the access holes and down through the frame slots.

9. Torque Fasteners:

   • Torque 1/2”-13 GR5 bolts to 75 lb-ft (102 N·m).
   • Torque M14 x 2.0 CL10.9 bolts to 115 lb-ft (156 N·m).

10. Reinstall Spare Tire:

    • Reinstall the spare tire, ensuring it does not interfere with the hitch or fasteners.

Hardware List:

• (4) Hex Bolts, M14 x 2.0 x 45mm CL10.9
• (6) 1/2”-13 Hex Nuts
• (4) Conical Toothed Washers, 5/8” (black)
• (2) Carriage Bolts, 1/2”-13 x 2” GR5
• (2) Spacer Blocks, 1-1/2” x 2” (short-bed only)
• (10) Conical Toothed Washers, 1/2” (gold)

Safety Notes:

• Check the hitch frequently to ensure all fasteners and the ball are properly tightened.
• If the hitch is removed, plug all holes in the trunk pan or other body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Observe safety precautions when working beneath a vehicle, and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type and Weight Ratings:
  • Weight Distributing: Max Trailer Weight 12,000 lbs (5,448 kg), Max Tongue Weight 1,200 lbs (545 kg).
  • Weight Carrying (Ball Mount): Max Trailer Weight 8,000 lbs (3,632 kg), Max Tongue Weight 800 lbs (363 kg).
• Complies with safety specifications and requirements for connecting devices and towing systems of the State of New York, V.E.S.C. Regulation V-5, and SAE J684.

Installation Instructions for 7-Way Flat Pin Connector / 4-Flat Combo Adapter Harness

Part Numbers:

• 74682

Tools Required:

• Phillips Head Screwdriver
• Adjustable Wrench

Mounting Bracket Instructions:

1. Determine a suitable mounting point on the tow vehicle for the connector or use an existing mount. Ensure the trailer’s wire harness has sufficient length to reach this point.
2. Secure the mounting bracket on the rear of the tow vehicle or to the plate attached to the hitch cross tube using the self-tapping screws provided.
   • Caution: Do not drill into the hitch cross tube to avoid damage to the hitch or personal injury. Do not drill into any exposed surfaces. Refer to the hitch owner’s manual or instruction sheet for recommendations and limitations.

Socket Instructions:

1. Install the 7-way Blade Socket (connector) onto the mounting bracket using the screws and nuts provided.
2. Plug the OEM factory-equipped car-end socket harness into the 7-way Blade Car Socket.
3. Insert the 4-flat connector into the slot in the bracket.
4. Tighten all screws securely.

Safety Notes:

• All connections must be completed to ensure proper functionality. Test and verify the installation using a test light, circuit tester, or trailer.
• Warning: Overloading circuits can cause fires. DO NOT exceed the lower of the towing manufacturer’s rating or:
  • Max Right Turn, Left Turn, Stop, and Tail Light Circuits: 7.5 amps
  • Max (+) Battery, Reverse, and Electric Brake Circuits: 30 amps
• Consult the vehicle’s owner’s manual and instruction sheet for additional information. Additional fusing may be required.

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: Improper use or failure to follow instructions may result in property damage, serious injury, or death. Always consult your vehicle and trailer manuals for compatibility and installation guidelines.

Installation and Operation Instructions for the P3 Electronic Brake Control

Specifications:

• Supports 2, 4, 6, and 8 brake applications.
• Utilizes proportional braking with an inertial sensor.

Tools Required:

• Drill with a 1/8" bit.
• Screwdriver or nut driver.
• Wire crimp tool.
• Probe-type circuit tester.

Safety Notes:

1. Avoid mounting or activating RF-generating devices (e.g., cell phones) within 12 inches of the brake control.
2. Always adhere to the vehicle's Gross Combined Weight Rating (GCWR).
3. Do not use the Boost feature during icy or slippery road conditions.
4. Disconnect the trailer plug before testing a breakaway switch to prevent damage.

Hardware List:

• P3 Brake Control Unit.
• Mounting bracket.
• Wiring harness.
• #8 x 3/8" self-tapping screws.

Installation Instructions:

Mounting the Brake Control:

1. Traditional Bracket Mount:

   • Secure the bracket to a solid surface using the provided screws.
   • Attach the brake control unit and adjust to the desired angle.
   • Tighten screws securely.

2. Under Dash Pocket Mount:

   • Secure the small metal bracket with screws to a flat surface.
   • Attach the T-slot mount to the metal bracket and insert the brake control.

Wiring the Brake Control:

• Option 1: Use the included pigtail wiring harness for a generic installation.
• Option 2: Use an OEM-specific wiring harness compatible with the vehicle's tow package.
• Wire Functions:
  • Black: Positive power (+12V).
  • White: Vehicle ground.
  • Red: Cold side of brake pedal switch.
  • Blue: Trailer brakes output.

Setting Up the Control:

1. Connect the trailer to the vehicle.
2. Use the Menu/Options button to access the setup screen.
3. Select the brake type:
   • Electric: For electric brakes.
   • Hydraulic: For electric over hydraulic braking systems.
4. Adjust the power output to ensure effective braking without wheel lock-up.

Boost Feature:

• Provides enhanced braking sensitivity.
• Available in three levels:
  • B1: Light braking boost.
  • B2: Moderate braking boost.
  • B3: Aggressive braking boost.
• Recommended for heavier trailers or varying load conditions.

Reverse Mode:

• Cancel Boost and Hold features for 3 minutes by pressing and holding the Boost button for 5 seconds while holding the brake pedal.

Troubleshooting Guide:

Maintenance:

• Inspect connections and wiring regularly for damage or wear.
• Adjust trailer brakes after the first 200 miles of use and every 3,000 miles thereafter.
• Clean the brake control unit periodically to maintain optimal performance.

Warranty Information:

• Limited Lifetime Warranty:
  • Covers defects in materials and workmanship under normal use.
  • Excludes damage caused by misuse, improper installation, or external factors.
• Attention: For complete warranty instructions, 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.