Installation Instructions for 2021-Current Mercedes GLA250

Part Numbers:

• 76473
• 84473
• CQT76473

Tools Required:

• Ratchet
• Torque Wrench
• Safety Glasses
• Sockets: 8 mm, 10 mm, 16 mm, 3/4”
• Universal Joint
• Tin Snips
• Drill
• Drill Bit: 17/32”
• Marker

Step-by-Step Instructions:

1. Lower Exhaust:

   • Use a 10 mm socket to remove one bolt from the rearward driver-side exhaust hanger. Repeat on the passenger side.
   • Disconnect the exhaust sensor on the passenger side before lowering.
   • Use a 16 mm socket to remove two bolts from the mid-vehicle exhaust hanger. Set the hardware aside for reuse.

2. Remove and Trim Heat Shield:

   • Use an 8 mm socket to remove five screws from the underside of the vehicle (three near the center fascia and one per side near the exhaust).
   • Remove four nuts from the center of the heat shield and gently set it aside.
   • Use tin snips to trim the heat shield as shown in Figure 2. Reinstall the heat shield using four nuts and three screws removed earlier (remaining two screws are not reused).

3. Remove Frame Rail Hardware:

   • Use a T25 star driver to remove one screw from the driver-side frame rail. Repeat on the passenger side.

4. Drill Holes:

   • Raise the hitch into position and align with the two foremost attachment holes. Use a marker to mark the second rearmost hole center on both sides.
   • Lower the hitch and drill a 1/2” hole in the marked locations on both sides.

5. Install Hitch:

   • Use pull wires to feed carriage bolts and spacers into the frame rails through the foremost access hole.
   • Raise the hitch into position and align it with the drilled holes. Remove pull wires and loosely install the following hardware:
     • M8 bolts
     • Conical washers
     • Flat washers
     • Hex nuts

6. Tighten Fasteners:

   • Tighten all 1/2”-13 GR5 fasteners to 75 ft-lbs (102 Nm).
   • Tighten all M8 fasteners to 20 ft-lbs (27 Nm).

7. Reinstall Exhaust and Sensor:

   • Raise the exhaust back into position and reattach the sensor using the hardware removed earlier.

Hardware List:

• (4) Carriage Bolt 1/2”-13 x 1.75” GR5
• (4) Conical Washer 1/2”
• (4) Hex Nut 1/2”-13 GR5
• (2) Spacer 1/4” x 1.00” x 3.00”
• (2) Spacer 1/4” x 1.00” x 2.00”
• (4) Pull Wire 1/2”-13
• (4) M8 Hex Bolt
• (2) Flat Washer 3/8”

Safety Notes:

• Always wear safety glasses during installation.
• Ensure proper torque to keep the hitch securely mounted to the vehicle.
• Regularly check all fasteners and the hitch for proper tightness.
• Replace any damaged hitch or ball immediately.
• Do not cut or modify the hitch.

Specifications:

• Weight Carrying Capacity: 3,500 lbs (1,587 kg) trailer weight, 525 lbs (238 kg) tongue weight.
• Weight Distributing Capacity: Not applicable.
• Product complies with V.E.S.C. Regulation V-5 and SAE J684.

Additional Notes:

• Installation time for professional installers is approximately 90 minutes.
• For step-by-step photo instructions, scan the QR code provided in the manual or visit the website.

Installation Instructions for 2021-Current Mercedes GLA250

Part Numbers:

• 76473
• 84473
• CQT76473

Tools Required:

• Ratchet
• Torque Wrench
• Safety Glasses
• Sockets: 8 mm, 10 mm, 16 mm, 3/4”
• Universal Joint
• Tin Snips
• Drill
• Drill Bit: 17/32”
• Marker

Step-by-Step Instructions:

1. Lower Exhaust:

• Use a 10 mm socket to remove one bolt from the rearward driver-side exhaust hanger. Repeat on the passenger side.
• Disconnect the exhaust sensor on the passenger side before lowering.
• Use a 16 mm socket to remove two bolts from the mid-vehicle exhaust hanger. Set the hardware aside for reuse.

2. Remove and Trim Heat Shield:

• Use an 8 mm socket to remove five screws from the underside of the vehicle (three near the center fascia and one per side near the exhaust).
• Remove four nuts from the center of the heat shield and gently set it aside.
• Use tin snips to trim the heat shield as shown in Figure 2. Reinstall the heat shield using four nuts and three screws removed earlier (remaining two screws are not reused).

3. Remove Frame Rail Hardware:

• Use a T25 star driver to remove one screw from the driver-side frame rail. Repeat on the passenger side.

4. Drill Holes:

• Raise the hitch into position and align with the two foremost attachment holes. Use a marker to mark the second rearmost hole center on both sides.
• Lower the hitch and drill a 1/2” hole in the marked locations on both sides.

5. Install Hitch:

• Use pull wires to feed carriage bolts and spacers into the frame rails through the foremost access hole.
• Raise the hitch into position and align it with the drilled holes. Remove pull wires and loosely install the following hardware:
  • M8 bolts
  • Conical washers
  • Flat washers
  • Hex nuts

6. Tighten Fasteners:

• Tighten all 1/2”-13 GR5 fasteners to 75 ft-lbs (102 Nm).
• Tighten all M8 fasteners to 20 ft-lbs (27 Nm).

7. Reinstall Exhaust and Sensor:

• Raise the exhaust back into position and reattach the sensor using the hardware removed earlier.

Hardware List:

• (4) Carriage Bolt 1/2”-13 x 1.75” GR5
• (4) Conical Washer 1/2”
• (4) Hex Nut 1/2”-13 GR5
• (2) Spacer 1/4” x 1.00” x 3.00”
• (2) Spacer 1/4” x 1.00” x 2.00”
• (4) Pull Wire 1/2”-13
• (4) M8 Hex Bolt
• (2) Flat Washer 3/8”

Safety Notes:

• Always wear safety glasses during installation.
• Ensure proper torque to keep the hitch securely mounted to the vehicle.
• Regularly check all fasteners and the hitch for proper tightness.
• Replace any damaged hitch or ball immediately.
• Do not cut or modify the hitch.

Specifications:

• Weight Carrying Capacity: 3,500 lbs (1,587 kg) trailer weight, 525 lbs (238 kg) tongue weight.
• Weight Distributing Capacity: Not applicable.
• Product complies with V.E.S.C. Regulation V-5 and SAE J684.

Additional Notes:

• Installation time for professional installers is approximately 90 minutes.
• For step-by-step photo instructions, scan the QR code provided in the manual or visit the website.

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.

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.

Warranty Information:

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

Installation Instructions for Modulite® HD Protector Vehicle Wiring

Part Number:

• 119148

Tools Required:

• Phillips Head #2 Screwdriver
• Wire Cutters
• Wire Strippers/Wire Crimpers
• Tester or Volt Meter
• Socket & Ratchet Set
• Drill with 3/32” Drill Bit
• Double-Sided Tape

Step-by-Step Instructions:

Tow Vehicle Inputs - Determination:

1. Disconnect and isolate the vehicle's negative battery terminal.
   • Warning: Read and follow all warnings and instructions on the tow vehicle's battery.
2. Splice the tow harness input wires to the vehicle as determined.
   • Caution: Use appropriate gauge wire splices. Blue taps are for 16-18 gauge wires only.

Harness Installation:

1. Determine the mounting location of the module and secure it using the double-sided tape provided.
   • Warning: Mount the module with the epoxy side pointed towards the ground to prevent water buildup.
2. Locate a suitable grounding point near the module, such as an existing ground stud, or drill a 3/32” hole to secure the white wire using the provided eyelet and screw.
   • Caution: Verify what is behind any surface before drilling to avoid damage or personal injury.
3. Route the power wire to the vehicle’s positive battery terminal. Use the provided fuse holder, butt connector, and ring terminal to connect to the battery.
   • Do not insert the 15 amp fuse yet.
   • Caution: Ensure the module is connected to a constant power source and avoid routing the wire near hot pipes, heat shields, fuel tanks, or pinch points.

Completion:

1. Secure the harness with cable ties provided to prevent damage or rattling.
2. Reconnect the vehicle's negative battery cable.
3. Insert the 15 amp fuse into the fuse holder and close the cap.
4. Test the installation using a test light or trailer. Check each function independently and in combination.

Hardware List:

• 8 × Cable Ties, 8.5”
• 1 × 15 AMP Fuse
• 2 × Ring Terminals
• 1 × Fuse Holder
• 2 × Yellow Butt Connectors
• 1 × Self-Tapping Screw
• 4 × Blue Taps
• 1 × Spade Terminal

Wiring Outputs:

• White Wire: Ground
• Brown Wire: Tail
• Yellow Wire: Left Turn/Brake
• Green Wire: Right Turn/Brake
• Red Wire: Stop (for 3-wire systems only)

Safety Notes:

• Always read and follow all warnings and instructions included with the product and the vehicle's manual.
• Do not exceed the manufacturer’s towing capacity or the product’s amperage ratings.
• Wear safety glasses and use all necessary safety precautions during installation.

Troubleshooting Guide:

• 4-Flat Not Functioning: Ensure input wires are correctly installed and repeat testing after removing the 15 amp fuse for 10 seconds.
• No Power to 4-Flat: Check the chassis ground and ensure the module is properly connected to a constant power source.

Specifications:

• Installation Time: Approximately 45 minutes
• Compatibility: Does not work with multiplex vehicles (BM, BT, or BTT). Use part numbers 119190 or 119250 for these systems.

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.

For warranty information, please download the full installation PDF.