Installation Instructions for Cadillac CTS, CTS-V, and STS

Part Numbers:

• 77143
• 24767
• 60830

Wiring Access Location:

• 2003-2004 CTS: PC3
• 2005-2006 CTS & CTS-V: PC3, PC4
• 2005-2006 STS: PC3, PC4

Tools Required:

• Wrenches: 11/16"
• Drill Bits: 1/8", 1/2"
• Sealant

Specifications:

• Max Gross Trailer Weight: 2,000 lb. (908 kg)
• Max Tongue Weight: 200 lb. (90.8 kg)
• Note: Do not exceed the towing vehicle manufacturer’s rating.

Step-by-Step Instructions:

1. Lower Muffler(s):

   • Remove the two (2) rearmost exhaust hangers and one (1) forward exhaust hanger to lower the muffler(s).

2. Prepare the Trunk:

   • Inside the trunk, remove the spare tire cover.
   • Detach the plastic liner at the rear of the trunk by removing four (4) net tie-downs.
   • Remove the spare tire or storage bin for better access to the trunk floor. Use a screwdriver to release the retainer washer and pull the bin upwards.
   • Roll back the carpet and padding to expose the trunk pan.

3. Position Hitch:

   • Carefully raise the hitch into position to avoid scratching the fascia.
   • For dual exhaust models, raise one bracket between the trunk pan and exhaust, and slide the other bracket over the second exhaust.
   • Align the rear edge of the hitch brackets flush with the frame end panel.

4. Mark and Drill Holes:

   • Using the hitch as a template, mark and center punch two (2) holes on each side.
   • Lower the hitch and drill 1/8” pilot holes through the trunk pan. Adjust alignment if needed, then enlarge the holes to 1/2".

5. Install Plates and Bolts:

   • Place the mounting plates over the drilled holes inside the trunk.
   • Insert carriage bolts through the plates and trunk pan. Trim the carpet padding underneath if needed for the plate to sit flat.
   • Important: Seal all drilled holes to prevent exhaust fumes from entering the trunk.

6. Attach Hitch:

   • Raise the hitch into position and secure it using lock washers and hex nuts on the carriage bolts.
   • Torque all 7/16"-14 GR5 fasteners to 50 Lb.-Ft. (68 N*M).

7. Reassemble Trunk Components:

   • Roll the carpet and padding back into place.
   • Reinstall the spare tire or storage bin and retainer washer (use a deep socket for this step).
   • Reattach the spare tire cover and the plastic liner.

8. Reinstall Exhaust:

   • Reattach all exhaust hangers removed earlier.

Hardware List:

• (4) Carriage Bolts: 7/16"-14 x 1.5"
• (4) Lock Washers: 7/16"
• (2) Plates
• (4) Hex Nuts: 7/16"-14

Safety Notes:

• Regularly inspect all fasteners and the hitch ball to ensure proper tightening.
• If the hitch is removed, plug any holes in the trunk pan to prevent water and exhaust fumes from entering.
• Replace any damaged hitch or ball immediately.
• Always observe safety precautions and wear eye protection when working beneath the vehicle.
• Do not use a torch to cut access or attachment holes.

Drawbar:

• Drawbar Kit: 3594
• Important: The drawbar must be used in the rise position only.

Compliance:

• This product complies with SAE J684, V.E.S.C. Regulation V-5, and safety requirements of the State of New York.

Additional Notes:

• Check the hitch frequently to ensure all fasteners remain tight.

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.