Installation Instructions for Subaru Legacy and Outback
(All Models)

Part Numbers:

• 75673
• 44631
• 87568
• 75159 (U-Haul)

Tools Required:

• Tin Snips
• Spray Lubricant
• Wrenches: 10mm, 11/16”
• Drill Bits: 1-1/8” Hole Saw

Wiring Access Location:

• PC3

Step-by-Step Instructions:

1. Lower the Exhaust:

   • Temporarily lower the exhaust system by removing the two rubber isolators from the muffler hangers and one below the rear axle.
   • Note: Spray hangers with lubricant to ease removal. For dual exhaust systems, repeat on both sides.

2. Lower Heat Shields:

   • Temporarily lower the heat shields by removing four (4) M6 bolts.
   • Save the bolts for reinstallation.

3. Remove Rubber Plugs:

   • Remove the rubber plugs from the holes in the bottom of the frame.

4. Drill Access Hole:

   • Drill a 1-1/8” access hole in the bottom of the frame approximately 2” from the forward heat shield attachment point (see Figure 1).

5. Fishwire Carriage Bolts:

   • Fishwire a 7/16”-14 x 1.5” carriage bolt and a 1” x 2” spacer block through the access hole and down through the rearmost hole in the frame.
   • Repeat with a 1” x 3” spacer block for the forward hole.

6. Position the Hitch:

   • Raise the hitch into position, aligning the holes in the hitch with the carriage bolts. Be careful not to push bolts back into the frame.

7. Install Rear Fasteners:

   • Loosely install conical toothed washers and hex nuts onto the rearmost carriage bolts.

8. Install Forward Fasteners:

   • Place a flat washer between the forward carriage bolt and the hitch bracket.
   • Install conical toothed washers and hex nuts onto the forward carriage bolts.
   • Tighten all fasteners to the specified torque (50 lb-ft or 68 N·m).

9. Trim Heat Shields:

   • Trim the heat shields around the forward attachment bolt area to ensure they sit flat against the hitch bracket.

10. Reinstall Heat Shields:

    • Reattach the heat shields on top of the hitch brackets using the four (4) M6 bolts removed earlier.

11. Reinstall the Exhaust:

    • Raise the exhaust back into position and reattach the rubber isolators, including the one under the axle.

Hardware List:

• (4) Carriage Bolts, 7/16”-14 x 1.5”
• (2) Flat Washers, 7/16”
• (2) Spacer Blocks, 3/16” x 1” x 2”
• (2) Spacer Blocks, 1/4” x 1” x 3”
• (4) Conical Toothed Washers, 7/16”
• (4) Fish Wires, 7/16”
• (4) Hex Nuts, 7/16”-14

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 body panels to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Follow safety precautions when working beneath the vehicle, and wear eye protection.
• Do not cut access or attachment holes with a torch.

Specifications:

• Hitch Type and Weight Ratings:
  • Weight Distributing: Not for use with spring bars.
  • Weight Carrying (Ball Mount): Max Trailer Weight 4,000 lbs (1,814 kg), Max Tongue Weight 600 lbs (272 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 T-Connector Trailer Wiring Harness

Product Information:

• Part Number: N118511
• Application: Subaru Legacy

Tools Required:

• Trim Panel Remover
• 10mm Socket & Ratchet (or Wrench)
• Drill with 3/32” drill bit
• Test Probe

Step-by-Step Instructions:

1. Prepare the Vehicle:

   • Open the trunk.
   • Remove the threshold panel to access the trunk floor.
   • Partially detach the felt trunk liner on both sides to expose the taillight wiring harness.
   • Remove the access panels on both sides.

2. Locate the Taillight Wiring Harness:

   • On both the driver’s side and passenger’s side, locate the taillight wiring harness connectors.
   • Carefully disconnect the connectors, ensuring not to break the locking tabs.
   • Ensure all surfaces are clean and free of dirt or debris.

3. Install the T-Connector:

   • On the driver’s side, connect the T-Connector with the yellow wire between the vehicle’s taillight connectors.
   • Ensure the connectors are fully engaged and locked into place.
   • Route the T-Connector harness with the green wire across the threshold to the passenger side.
   • Connect the green wire T-Connector to the passenger-side taillight harness.

4. Ground the White Wire:

   • Locate a suitable grounding point near the driver-side wiring harness.
   • Use an existing ground stud or drill a 3/32” hole into clean, bare metal.
   • Secure the white wire using the provided eyelet and screw.

   Caution: Verify what is behind the surface before drilling to avoid damage or injury.

5. Connect the Power Wire:

   • Connect the red power wire from the T-Connector’s black module to the black 12-gauge power wire using the yellow butt connector.
   • Route the black power wire:
     • Through an existing grommet or along the thresholds to the engine compartment.
     • Avoid sharp edges, moving parts, or hot components such as the exhaust and fuel lines.

6. Install the Fuse Holder:

   • Cut the yellow fuse holder wire and attach the ring terminal to one end.
   • Secure the ring terminal to the vehicle’s positive battery terminal.
   • Use the yellow butt connector to attach the fuse holder to the black power wire.
   • Insert the provided 10-amp fuse into the fuse holder.

7. Reconnect the Battery:

   • Reconnect the vehicle’s negative battery terminal.
   • If applicable, temporarily remove the key from the ignition to reset the vehicle’s electrical system.

8. Test the Wiring System:

   • Use a test light or connect a trailer to verify functionality of:
     • Running Lights
     • Brake Lights
     • Left Turn Signal
     • Right Turn Signal

9. Mount the T-Connector Black Box:

   • Clean a flat surface on the driver-side floor area in the rear cargo space using rubbing alcohol and water.
   • Secure the T-Connector black box using the provided double-sided tape.

10. Secure the Wiring Harness:

    • Use the provided cable ties to secure the wiring harness, ensuring it does not pinch, rattle, or contact hot/moving components.
    • Reinstall the threshold panel, trunk liner, and access panels.

11. Store the 4-Flat Connector:

    • Place the 4-flat connector in the rear cargo area when not in use.

Specifications:

• Stop/Turn Lights: 2.1 amps per side
• Tail Lights: 5.6 amps maximum

Safety Notes:

• Verify all trailer lighting functions before towing.
• Avoid overloading circuits beyond the specified amperage ratings.
• Periodically inspect the wiring harness for damage, wear, or corrosion.

Warnings:

• Do not drill into areas without verifying what’s behind the surface.
• Avoid routing wires near hot pipes, sharp edges, or moving parts.
• Overloading circuits may result in fire or system failure.

Technical Support:
For further assistance, contact the manufacturer’s technical support team.

Note: Store the 4-flat connector in the rear cargo area when not in use to prevent damage.

Installation Instructions for 4-Way to 7-Way Adapter and Brake Control Wiring

Tools Required:

• Phillips Head Screwdriver
• Drill with 3/32" Drill Bit
• 10mm Socket & Ratchet or Wrench
• Wire Crimpers
• Wire Cutters
• Test Light or Multimeter
• Cable Ties

Part 1: Install the 4-Way to 7-Way Adapter

Step-by-Step Instructions:

1. Mount the Adapter:

   • Choose a suitable mounting point on the vehicle, typically near the hitch.
   • Use the provided bracket and screws to secure the adapter.

2. Connect the 4-Flat Plug:

   • Plug the 4-flat connector on the adapter into the existing 4-flat plug on the vehicle.
   • This connection enables tail lights, left turn, and right turn signals.

3. Ground the Adapter:

   • Locate a clean, solid grounding point near the adapter.
   • Drill a 3/32" hole if necessary and secure the white ground wire from the adapter using the provided screw and eyelet.

4. Leave Additional Wires Disconnected:

   • The following wires will remain disconnected until Part 2:
     • Black Wire: Power from the battery.
     • Blue Wire: Brake control output.
     • Yellow Wire: Reverse light (optional; leave disconnected unless needed).

5. Test Initial Connection:

   • Use a test light or trailer to verify functionality of the 4-way connections (tail lights, turn signals).

Part 2: Install Brake Control Wiring

Step-by-Step Instructions:

1. Mount Circuit Breakers:

   • Install two 30A circuit breakers on the firewall or another suitable location near the battery.
   • Use self-tapping screws to mount them securely.

2. Route Power Wires:

   • Connect the black 12-gauge wire from the 7-way adapter to the auxiliary side of one circuit breaker (this powers the 7-way socket).
   • Run a heavy-gauge wire from the battery's positive terminal to the battery side of this circuit breaker, using a ring terminal.
   • Run another heavy-gauge wire from the battery's positive terminal to the auxiliary side of the second circuit breaker (for the brake controller).

3. Install the Brake Controller:

   • Mount the brake controller under the dash on a firm surface.
   • Use the following connections:
     • Red Wire: Connect to the cold side of the brake switch (active only when the brake pedal is pressed).
     • Blue Wire: Connect to the blue wire on the 7-way adapter for trailer brakes.
     • White Wire: Connect to a solid ground point on the vehicle body.
     • Black Wire: Connect to the auxiliary side of the second 30A circuit breaker (provides power to the brake controller).

4. Optional: Connect Reverse Light Circuit:

   • If the trailer has a reverse light circuit, connect the yellow wire from the 7-way adapter to the vehicle’s reverse light circuit.

5. Reconnect the Battery:

   • Reattach the negative battery cable and ensure all connections are secure.
   • Insert the fuses into both circuit breakers.

6. Secure All Wires:

   • Use cable ties to secure all loose wires and prevent damage or rattling.

7. Test the System:

   • Verify functionality of all circuits (running lights, turn signals, brake lights, and brake controller output).
   • If applicable, test the reverse light circuit.

Notes:

• Most installations will only require connecting the black and blue wires from the 7-way adapter.
• Leave the yellow wire disconnected unless the trailer has a reverse light or surge brake lockout circuit.
• Always adhere to safety guidelines and verify all connections before use.

Warning: Incorrect wiring can cause damage to the vehicle or trailer. Test all connections carefully before use.

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.