NJSBYL 6‑Pin Leer Truck Cap Wiring Harness — 77in TAG Fuse Box Plug, Powers 3rd Brake Light & Dome/Locks

The NJSBYL 6-pin wiring harness provides a plug-and-play power connection for Leer camper shells, supplying circuits for the third brake light, interior dome light, lock/unlock functions and auxiliary trailer lighting.

Designed specifically for Leer pickup toppers that use a TAG fuse box, this single harness replaces tangled DIY wiring with an integrated 6-conductor cable engineered for reliable electrical performance. At 197 cm (77 inches) long and built from durable, heat-resistant materials, it gives you enough reach to route cleanly around the truck cab while keeping each function on its own dedicated conductor. Installation requires no cutting of factory panels — the socket plugs into the bottom of the existing fuse box for a tidy connection.

How does this harness power multiple components at once?

The harness groups six individual wires so each component has an independent circuit, preventing interference and simplifying troubleshooting. It connects directly into the TAG fuse box on compatible Leer toppers, routing power and signal lines to the accessory locations at the rear and inside the shell.

• Six separate conductors — one per function for clear wiring paths
• Dedicated wires for 3rd brake light, dome light, locks, unlocks and auxiliary lights
• Compatible with the Leer TAG fuse box for seamless integration

How difficult is installation for a DIYer?

Installation is intentionally straightforward: find the TAG fuse box on the camper shell and plug the harness socket into the connector at the fuse box bottom. No cutting, soldering, or major panel removal is necessary, making it suitable for most owners with basic tools and a flashlight.

• Plug-and-play connector designed for the fuse box socket location
• No destructive modifications to the topper or truck finish
• Clear alignment and length to reach typical component locations

What are the build and durability features?

The cable assembly uses materials chosen for electrical conductivity and long-term heat tolerance to stand up to automotive conditions. The 77-inch length gives installers flexibility in routing and mounting while maintaining secure connections and reducing strain on terminals.

• 197 cm (77 in) total length for flexible routing options
• Heat-resistant insulation and reliable conductor materials
• Pre-terminated connector designed to match the Leer TAG fuse box

Will this harness support trailer lights and accessory loads?

Yes — one of the conductors is intended to feed auxiliary trailer lighting or other low-to-moderate draw accessories, while remaining wires handle the topper-specific functions. For heavy-draw trailer systems or aftermarket amplifiers, verify circuit ratings and add relays or fusing as required.

• Auxiliary conductor suitable for common trailer light loads
• Use of proper fuses recommended; harness works with the TAG fuse box setup
• For higher current needs, install relays or additional fused circuits

Who is this for: The NJSBYL 6-pin Leer truck cap wiring harness is aimed at Leer topper owners who want a neat, factory-compatible way to power interior lights, the third brake lamp, lock/unlock actuators and auxiliary lighting without extensive rewiring. It’s ideal for DIY installers, fleet technicians, and pickup owners who prefer a reliable, OEM-friendly electrical solution that preserves the appearance of the truck and camper shell.