Power Meets Intelligence.

Introducing the STEDI™ 4x Connector DT-4 Plug & Play SMART Harness™, the next evolution in driving light wiring systems. Engineered for high-current, dual-relay applications, this heavy-duty harness enables seamless control of up to four lights with integrated Daytime Running Light (DRL) functionality—all without cutting, soldering, or guesswork.

⚡ Unmatched Power & Reliability

Built from the ground up with 10AWG heavy-duty cable and dual 80A relays, the SMART Harness™ delivers uncompromising performance under load. With a 75A total capacity and dual 45A fuse protection, it’s ready to handle the most demanding auxiliary lighting systems with ease.

🔌 Plug & Play Smart Switching

Our advanced Smart Harness™ technology automatically detects positive and negative switching systems, making it a universal solution for vehicles including Toyota, Ford Ranger, and Mazda BT-50—no polarity testing required.

Simply plug in and the harness configures itself for perfect operation, every time.

💡 Designed for the Modern Lighting Ecosystem

Each harness includes four DT-4 Deutsch connectors (20A rated) with 2.0m of cable per connector, enabling clean, waterproof connections for DRL-enabled driving lights. Whether you’re upgrading existing gear or wiring a new setup, this harness ensures a professional, durable installation.

🔩 Key Features

• Supports up to 4 auxiliary lights simultaneously

• 2 × 80A relays for robust current handling

• Automatic polarity detection (positive or negative switch)

• Built-in DRL mode compatibility

• Dual 45A fuse protection for maximum safety

• 10AWG heavy-duty conductors for high load performance

• Plug & Play quick connect system—no splicing or soldering

• UV-rated insulation for durability in all environments

🛠 Technical Specifications

📦 What’s Included

• 1 × 4-way Output DT-4 SMART Harness™

• 2 × 80A Relays

• 2 × 45A Fuses

• 1 × 0.78" Dime Switch (red illumination)

• 1 × Cable Tie Set

• 1 × Wiring Diagram