STDYSUN 12V LED Work Light Wiring Harness Kit — 3.5m 14AWG, 40A Relay & Switch for Dual Light Bars

STDYSUN remote wiring harness kit connects two 12V LED work or driving lights to a dashboard switch with a 40A relay and a 3.5m 14AWG main cable for safe, reliable power delivery.

This plug-and-play wiring kit is built to manage dual LED light bars or fog lamps without altering your vehicle's original wiring. It bundles a keyed on/off switch, heavy-duty 40A relay and blade fuse, and appropriately gauged 14AWG and 16AWG conductors in a single loom so installers get a tidy, protected run from battery to lights. Materials include copper conductors, durable PVC insulation and a universal connector to speed up fitting on cars, trucks and off-road rigs.

How does this harness simplify installation?

The kit arrives pre-assembled so you avoid splicing multiple wires or sourcing separate relays and fuses. A single battery-positive lead and a ground make the main power connection straightforward, while the included plug-in switch controls the relay remotely. The 3.5 meter length allows flexible routing through engine bays and cabin firewalls.

• Pre-wired loom with universal plug for fast connection
• 3.5 m (≈11.48 ft) main cable to reach most battery positions
• Included switch mounts inside the cabin without cutting factory circuits
• Blade fuse and 40A relay protect lights and wiring

What light setups and power limits are supported?

This harness is designed to operate two LED lamps together and supports combined loads up to 300W on a 12V system (about 25A for each lamp when evenly split). For single-lamp operation keep each fixture under 150W. If your vehicle uses 24V electricals, swap to a matching 24V relay before use.

• Designed for 12V systems; relay replacement required for 24V vehicles
• Maximum recommended combined wattage: 300W (12V)
• Safe single-lamp limit: ≤150W
• Relay rating: 40A blade type with protective fuse included

How durable and safe is the wiring harness?

Materials focus on corrosion resistance and heat tolerance: copper conductors inside PVC sheathing and a molded connector help keep moisture and abrasion out. The relay and fuse arrangement isolates high current from the cabin switch, reducing heat buildup at the dash and protecting the vehicle's factory wiring. Rated components and correct wire gauges ensure reliable long-term operation when installed per instructions.

• Main conductor: 14AWG (2 mm² equivalent) for high-current feed
• Accessory wires: 16AWG for switch and control circuits
• Highest working temperature rated to 85°C for typical automotive environments
• Includes safety blade fuse and instruction manual for proper wiring

Who is this for? Installers, DIYers and vehicle owners fitting aftermarket LED bars, fog lights or work lamps who want a compact, safe wiring solution without modifying factory harnesses. It suits cars, trucks, ATVs and off-road builds that run 12V electrical systems and need a tidy, relay-protected feed with a cabin-mounted switch. If you operate at 24V, plan to replace the relay with a 24V-rated unit and follow the included wiring guidance for safe performance.