Installation Instructions for T-One® T-Connector for BMW X2

Part Numbers:

• 118789

Tools Required:

• Trim Panel Remover
• 10mm Socket & Ratchet or 10mm Wrench
• Drill (3/32” Drill Bit)
• 1/4” Socket
• Wire Crimpers
• Wire Cutters
• Phillips Head Screwdriver
• Test Probe

Step-by-Step Instructions:

1. Remove the Taillight Assemblies:

   • Open the tailgate and carefully pry the black taillight trim cover using a trim panel remover to expose the two 10mm taillight fasteners on the driver’s side.
   • Remove the two 10mm screws on both driver and passenger sides.
   • Gently pull the taillights away from the vehicle, being cautious not to damage the alignment pins. Set the taillight housings aside.

2. Locate the Taillight Wiring Harness:

   • On both sides of the vehicle, locate the taillight wiring harness.
   • Disconnect the wiring connectors carefully, ensuring not to break the locking tabs. Ensure all connectors are clean and free of dirt.

3. Mount the T-One® Black Box:

   • Determine a suitable mounting point behind the rear bumper fascia on the driver’s side.
   • Mount the black box module using the provided double-sided tape.
   • Ensure the trailer wire harness has adequate length to reach this point.

   Warning: Mount the module with the epoxy side facing downward to prevent water accumulation.

4. Connect the Driver-Side T-Connector:

   • Route the T-Connector end with the yellow wires through the bumper and vehicle body into the driver-side taillight pocket.
   • Insert the T-Connector end with the yellow wire between the driver-side taillight socket and the vehicle wiring harness.

5. Route the Passenger-Side T-Connector:

   • Route the T-Connector end with the green wire underneath the bumper to the passenger side.
   • Insert the green wire end through the passenger-side opening and connect it between the taillight socket and the vehicle wiring harness.
   • Avoid hot pipes, heat shields, or areas that may pinch or damage the wires.

6. Ground the White Wire:

   • Locate a suitable grounding point near the connector, such as the vehicle frame or crossmember.
   • Clean the area of dirt and rustproofing.
   • Drill a 3/32” hole and secure the white wire using the provided eyelet and screw.

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

7. Route the Power Wire:

   • Locate the black 12-gauge power wire from the T-One® Connector box.
   • Attach the provided black wire and route it along the exterior frame or follow existing wiring to the vehicle’s battery.
   • Avoid areas that may pinch, cut, or break the wire.

8. Connect to the Vehicle Battery:

   • Disconnect the Negative (-) battery cable.
   • Remove the fuse from the yellow fuse holder and attach the ring terminal to the Positive (+) battery cable.
   • Connect the other end of the fuse holder to the black 12-gauge wire using the yellow butt connector.

   Warning: Follow all warnings and cautions printed on the tow vehicle’s battery.

9. Reconnect the Battery and Test:

   • Reconnect the Negative (-) battery cable.
   • Insert the 15-amp fuse into the fuse holder.
   • Test the installation using a test light or trailer.

10. Secure the Wiring Harness:

    • Use the provided cable ties to secure the harness, avoiding areas that may pinch, cut, or melt the wires.

11. Reassemble the Vehicle:

    • Replace all panels and components removed during installation, ensuring no wires are pinched or damaged.

12. Store the 4-Flat Connector:

    • Route the 4-flat harness underneath and to the center of the vehicle.
    • Mount the 4-flat end in an accessible location using a bracket or electrical box (not included).

Safety Notes:

• Overloading circuits can cause fires. Do not exceed stated product ratings or vehicle manufacturer specifications.
• Always wear safety glasses and follow all safety precautions during installation.

Manufacturer Notes:

• Refer to the vehicle owner’s manual and the instruction sheet for additional details.
• Store these instructions for future reference.

Installation Instructions for T-One® T-Connector for Various Vehicles

Part Numbers:

• 118789

Tools Required:

• Trim Panel Remover
• 10mm Socket & Ratchet or 10mm Wrench
• Drill (3/32” Drill Bit)
• 1/4” Socket
• Wire Crimpers
• Wire Cutters
• Phillips Head Screwdriver
• Test Probe

Step-by-Step Instructions:

1. Remove the Taillight Assemblies:

   • Open the tailgate and carefully pry the black taillight trim cover using a trim panel remover to expose the two 10mm taillight fasteners on the driver’s side.
   • Remove the two 10mm screws on both driver and passenger sides.
   • Gently pull the taillights away from the vehicle, being cautious not to damage the alignment pins. Set the taillight housings aside.

2. Locate the Taillight Wiring Harness:

   • On both sides of the vehicle, locate the taillight wiring harness.
   • Disconnect the wiring connectors carefully, ensuring not to break the locking tabs. Ensure all connectors are clean and free of dirt.

3. Mount the T-One® Black Box:

   • Determine a suitable mounting point behind the rear bumper fascia on the driver’s side.
   • Mount the black box module using the provided double-sided tape.
   • Ensure the trailer wire harness has adequate length to reach this point.

   Warning: Mount the module with the epoxy side facing downward to prevent water accumulation.

4. Connect the Driver-Side T-Connector:

   • Route the T-Connector end with the yellow wires through the bumper and vehicle body into the driver-side taillight pocket.
   • Insert the T-Connector end with the yellow wire between the driver-side taillight socket and the vehicle wiring harness.

5. Route the Passenger-Side T-Connector:

   • Route the T-Connector end with the green wire underneath the bumper to the passenger side.
   • Insert the green wire end through the passenger-side opening and connect it between the taillight socket and the vehicle wiring harness.
   • Avoid hot pipes, heat shields, or areas that may pinch or damage the wires.

6. Ground the White Wire:

   • Locate a suitable grounding point near the connector, such as the vehicle frame or crossmember.
   • Clean the area of dirt and rustproofing.
   • Drill a 3/32” hole and secure the white wire using the provided eyelet and screw.

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

7. Route the Power Wire:

   • Locate the black 12-gauge power wire from the T-One® Connector box.
   • Attach the provided black wire and route it along the exterior frame or follow existing wiring to the vehicle’s battery.
   • Avoid areas that may pinch, cut, or break the wire.

8. Connect to the Vehicle Battery:

   • Disconnect the Negative (-) battery cable.
   • Remove the fuse from the yellow fuse holder and attach the ring terminal to the Positive (+) battery cable.
   • Connect the other end of the fuse holder to the black 12-gauge wire using the yellow butt connector.

   Warning: Follow all warnings and cautions printed on the tow vehicle’s battery.

9. Reconnect the Battery and Test:

   • Reconnect the Negative (-) battery cable.
   • Insert the 15-amp fuse into the fuse holder.
   • Test the installation using a test light or trailer.

10. Secure the Wiring Harness:

    • Use the provided cable ties to secure the harness, avoiding areas that may pinch, cut, or melt the wires.

11. Reassemble the Vehicle:

    • Replace all panels and components removed during installation, ensuring no wires are pinched or damaged.

12. Store the 4-Flat Connector:

    • Route the 4-flat harness underneath and to the center of the vehicle.
    • Mount the 4-flat end in an accessible location using a bracket or electrical box (not included).

Safety Notes:

• Overloading circuits can cause fires. Do not exceed stated product ratings or vehicle manufacturer specifications.
• Always wear safety glasses and follow all safety precautions during installation.

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.

Manufacturer Notes:

• Refer to the vehicle owner’s manual and the instruction sheet for additional details.
• Store these instructions for future reference.

Warranty Information:

• 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.

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 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.

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 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.