Installation Instructions for Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada, and GMC Envoy

Part Numbers:

• 75079
• 44715
• 87478
• 78167 (U-Haul)

Wiring Access Location:

• SUV5

Tools Required:

• Wrenches: 7/8", 18mm

Step-by-Step Instructions:

For 1998 and Newer Models with Original Equipment Trailer Hitch:

1. Purchase left and right bumper brackets from a General Motors dealer (Part Numbers: 15719945 and 15719946).
2. Remove the original trailer hitch.
3. Install the purchased bumper brackets.

For 1998 and Newer Models Without Original Equipment Trailer Hitch:

1. Remove the forward bumper bolts (4) and return them to the vehicle owner.

Hitch Installation (All Models):

1. Raise the hitch into position.

2. Install three (3) 1/2"-13 x 1-3/4" carriage bolts, blocks, lock washers, and nuts on each side, as shown in the diagram.

3. Position the blocks as shown in the instructions.

4. Tighten All Fasteners:

   • Torque all 1/2"-13 Grade 5 fasteners to 75 lb-ft (102 N*m).

Torque Specifications:

• 1/2"-13 Grade 5 Fasteners: 75 lb-ft (102 N*m)

Hardware List:

• (6) Carriage Bolts, 1/2"-13 x 1-3/4" GR5
• (6) Blocks, 1/4" x 1-1/2" x 2"
• (6) Lock Washers, 1/2"
• (6) Hex Nuts, 1/2"-13

Safety Notes:

• Frequently inspect the hitch to ensure all fasteners and the ball are securely tightened.
• Replace any damaged hitch or ball immediately.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water or exhaust fumes from entering.
• Always wear safety glasses and observe proper safety precautions when working beneath the vehicle.
• Do not cut access or attachment holes with a torch.

Specifications:

• Weight Carrying (Ball Mount):
  • Max Gross Trailer Weight: 4,000 lb (1,816 kg)
  • Max Tongue Weight: 400 lb (182 kg)
• Weight Distributing:
  • Max Gross Trailer Weight: 6,000 lb (2,724 kg)
  • Max Tongue Weight: 600 lb (272 kg)

Additional Notes:

• Accessory Rating: Class C
• This product complies with V.E.S.C. Regulation V-5 and SAE J684 safety standards.

Installation Instructions for Chevrolet Blazer, GMC Jimmy, Oldsmobile Bravada, and GMC Envoy

Part Numbers:

• 75079
• 44715
• 87478
• 78167 (U-Haul)

Wiring Access Location:

• SUV5

Tools Required:

• Wrenches: 7/8", 18mm

Step-by-Step Instructions:

For 1998 and Newer Models with Original Equipment Trailer Hitch:

1. Purchase left and right bumper brackets from a dealership (Part Numbers: 15719945 and 15719946).
2. Remove the original trailer hitch.
3. Install the purchased bumper brackets.

For 1998 and Newer Models Without Original Equipment Trailer Hitch:

1. Remove the forward bumper bolts (4) and return them to the vehicle owner.

Hitch Installation (All Models):

1. Raise the hitch into position.

2. Install three (3) 1/2"-13 x 1-3/4" carriage bolts, blocks, lock washers, and nuts on each side, as shown in the diagram.

3. Position the blocks as shown in the instructions.

4. Tighten All Fasteners:

   • Torque all 1/2"-13 Grade 5 fasteners to 75 lb-ft (102 N*m).

Torque Specifications:

• 1/2"-13 Grade 5 Fasteners: 75 lb-ft (102 N*m)

Hardware List:

• (6) 1/2"-13 x 1-3/4" GR5 Carriage Bolts
• (6) 1/4" x 1-1/2" x 2" Blocks
• (6) 1/2" Lock Washers
• (6) 1/2"-13 Hex Nuts

Safety Notes:

• Frequently inspect the hitch to ensure all fasteners and the ball are securely tightened.
• Replace any damaged hitch or ball immediately.
• If the hitch is removed, plug all holes in the trunk pan or body panels to prevent water or exhaust fumes from entering.
• Always wear safety glasses and observe proper safety precautions when working beneath the vehicle.
• Do not cut access or attachment holes with a torch.

Specifications:

• Weight Carrying (Ball Mount):
  • Max Gross Trailer Weight: 4,000 lb (1,816 kg)
  • Max Tongue Weight: 400 lb (182 kg)
• Weight Distributing:
  • Max Gross Trailer Weight: 6,000 lb (2,724 kg)
  • Max Tongue Weight: 600 lb (272 kg)

Additional Notes:

• Accessory Rating: Class C
• This product complies with V.E.S.C. Regulation V-5 and SAE J684 safety standards.

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.

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.

Warranty:

The product comes with a standard warranty. For complete warranty instructions, please download the full installation PDF.

Installation Instructions for Trailer Light Wiring Kit

Part Number:

• 20252

Tools Required:

• Hot Air Gun or Appropriate Heat Source
• Wire Crimpers
• Drill (3/32” Drill Bit)
• Phillips Head Screwdriver
• Circuit Tester

Step-by-Step Instructions:

Step 1: Locate the Taillight Wiring Harness

1. Access the vehicle's taillight wiring harness.
2. Using the provided instructions, identify the appropriate wires for connection:
   • Green Wire: Right Turn & Stop
   • Yellow Wire: Left Turn & Stop
   • Brown Wire: Taillights
   • White Wire: Ground

Step 2: Make the Electrical Connections

1. Match the color-coded wires from the wiring kit to the corresponding vehicle wires.

   • Use a circuit tester to verify each wire's function before connecting.
   • CAUTION: Test one wire at a time to prevent damage to electronic components.

2. Connect the wires using the provided insulated butt connectors:

   • Strip the ends of each wire and seat them properly in the connector.
   • Use a crimping tool designed for insulated splices to secure the connections.

3. Heat the connectors:

   • Apply heat directly to the center of each splice using a hot air gun.
   • Work from the center outward until the tubing recovers and adhesive flows.
   • Allow the connections to cool before inspecting for integrity.

Step 3: Ground the System

1. Locate a grounding point near the wiring harness, such as the vehicle frame or cross member.
   • Do not drill into the vehicle floor or bed.
2. Clean the area to remove dirt, rust, or undercoating.
3. Drill a 3/32" hole at the grounding point and secure the white wire using the provided eyelet and screw.

Step 4: Verify the Installation

1. Test all connections using a circuit tester or trailer:
   • Verify the functionality of taillights, turn signals, and brake lights.
   • Ensure all connections are complete and secure.
2. If issues are identified, double-check the wiring and connections for errors.

Step 5: Store the 4-Flat Connector

• Store the 4-flat connector in the rear cargo area when not in use to protect it from damage and environmental exposure.

Warnings and Notes:

• WARNING: Overloading a circuit can cause fires. Do not exceed the following limits:
  • Stop/Turn Lights: 7.5 amps (1 per side)
  • Tail Lights: 7.5 amps
• WARNING: Always verify what is behind any surface before drilling to avoid vehicle damage or injury.
• NOTE: Trailer lighting that requires more than 7.5 amps per circuit must use a Trailer Light Power Converter.
• NOTE: If your trailer requires a plug other than the 4-flat, consult your dealer for optional 6-way or 7-way adapters.

Maintenance:

• Inspect the wiring harness periodically for damage, corrosion, or loose connections.
• Reapply heat to connectors if the adhesive seal weakens.

Specifications:

• Maximum Load:
  • Stop/Turn Lights: 7.5 amps (1 per side)
  • Tail Lights: 7.5 amps
• Recommended Grounding Hole Size: 3/32 inches

Installation Instructions for Trailer Light Wiring Kit

Part Number:

• 20252

Tools Required:

• Hot Air Gun or Appropriate Heat Source
• Wire Crimpers
• Drill (3/32” Drill Bit)
• Phillips Head Screwdriver
• Circuit Tester

Step-by-Step Instructions:

Step 1: Locate the Taillight Wiring Harness

1. Access the vehicle's taillight wiring harness.
2. Using the provided instructions, identify the appropriate wires for connection:
   • Green Wire: Right Turn & Stop
   • Yellow Wire: Left Turn & Stop
   • Brown Wire: Taillights
   • White Wire: Ground

Step 2: Make the Electrical Connections

1. Match the color-coded wires from the wiring kit to the corresponding vehicle wires.

   • Use a circuit tester to verify each wire's function before connecting.
   • CAUTION: Test one wire at a time to prevent damage to electronic components.

2. Connect the wires using the provided insulated butt connectors:

   • Strip the ends of each wire and seat them properly in the connector.
   • Use a crimping tool designed for insulated splices to secure the connections.

3. Heat the connectors:

   • Apply heat directly to the center of each splice using a hot air gun.
   • Work from the center outward until the tubing recovers and adhesive flows.
   • Allow the connections to cool before inspecting for integrity.

Step 3: Ground the System

1. Locate a grounding point near the wiring harness, such as the vehicle frame or cross member.
   • Do not drill into the vehicle floor or bed.
2. Clean the area to remove dirt, rust, or undercoating.
3. Drill a 3/32" hole at the grounding point and secure the white wire using the provided eyelet and screw.

Step 4: Verify the Installation

1. Test all connections using a circuit tester or trailer:
   • Verify the functionality of taillights, turn signals, and brake lights.
   • Ensure all connections are complete and secure.
2. If issues are identified, double-check the wiring and connections for errors.

Step 5: Store the 4-Flat Connector

• Store the 4-flat connector in the rear cargo area when not in use to protect it from damage and environmental exposure.

Warnings and Notes:

• WARNING: Overloading a circuit can cause fires. Do not exceed the following limits:
  • Stop/Turn Lights: 7.5 amps (1 per side)
  • Tail Lights: 7.5 amps
• WARNING: Always verify what is behind any surface before drilling to avoid vehicle damage or injury.
• NOTE: Trailer lighting that requires more than 7.5 amps per circuit must use a Trailer Light Power Converter.
• NOTE: If your trailer requires a plug other than the 4-flat, consult your dealer for optional 6-way or 7-way adapters.

Maintenance:

• Inspect the wiring harness periodically for damage, corrosion, or loose connections.
• Reapply heat to connectors if the adhesive seal weakens.

Specifications:

• Maximum Load:
  • Stop/Turn Lights: 7.5 amps (1 per side)
  • Tail Lights: 7.5 amps
• Recommended Grounding Hole Size: 3/32 inches

Warranty Information:

For complete warranty instructions, please download the full installation PDF.

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.

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.

Revision:

20252 Rev. A 2-6-07