Goopool 7-Pin Trailer Wiring Harness for 1999-2001 Ford F-250/F-350/F-450/F-550 — Direct-Fit OEM Replacement, Plug-and-Play

The Goopool 7-pin trailer wiring harness is a direct-fit, OEM-quality electrical plug designed to restore full 7-way trailer connectivity on 1999–2001 Ford F‑250, F‑350, F‑450 and F‑550 Super Duty trucks.

Built from durable materials and tested to meet or exceed OEM standards, this Goopool harness replaces part number 55243 and gives your truck a complete 7-way blade socket for taillights, brake lights, turn signals, reverse lights, electric trailer brakes and auxiliary power. It installs quickly without cutting or splicing and includes one 7-pin plug harness ready to connect to the vehicle side. Ideal for reinstating towing capability after wear, damage or an incompatible connector, this harness brings reliable electrical performance back to your truck’s towing system.

How does this harness restore trailer wiring on my Super Duty?

The Goopool harness provides a factory-style 7-pin blade socket that mates with standard trailer plugs, reestablishing all seven circuits required for modern trailers. It routes vehicle-side connections to full trailer functionality so lights and brakes operate as intended.

• Restores seven circuits: running lights, brake lights, left/right turn signals, reverse, electric brake, auxiliary power.
• Replaces OEM part 55243 for a direct fit on listed models.
• Designed for factory mounting locations and electrical compatibility.

Is installation difficult and will I need to modify my truck?

Installation is intended to be straightforward: this is a plug-and-play unit that connects to existing vehicle harnesses with no cutting, splicing or tapping required. The harness fits the factory opening for a 7-way blade socket, so most owners can complete the swap with basic hand tools.

• Plug-and-play design — no wire splicing.
• Includes one 7-pin trailer wiring plug harness ready to mount.
• Typical installation time: 15–45 minutes depending on truck access and mounting hardware.

What quality and compatibility assurances come with this Goopool harness?

Manufactured from premium materials and tested to meet or exceed OEM quality standards, this harness is built to withstand road vibration and weather exposure typical of towing applications. It replaces the factory part number 55243 and is specifically matched to 1999–2001 Ford Super Duty electrical systems.

• Constructed with durable connectors and corrosion-resistant contacts.
• Tested and certified for fit and function against OEM benchmarks.
• Covered by seller support for replacement if quality issues arise.

What exactly does the harness provide for trailer functionality?

The harness supplies a full 7-way blade socket on the truck, enabling trailers to use lighting, braking and auxiliary power features without separate adapters. It centralizes all trailer signals into the standard 7-pin connector used by most medium-duty trailers and RVs.

• Enables taillights, brake lights and turn signals.
• Provides electric trailer brake circuit and reverse light feed.
• Includes an auxiliary power wire for 12V accessory power to trailers.

Who is this for: Owners of 1999–2001 Ford F‑250, F‑350, F‑450 or F‑550 Super Duty trucks who need a reliable, OEM-fit 7-pin trailer wiring socket—whether replacing a damaged connector, upgrading from a 4-way, or restoring towing functions after repairs. It’s a practical, affordable option for DIY mechanics, fleet maintenance teams, and towing enthusiasts who want a durable, tested harness with straightforward installation and full 7-way trailer compatibility.