Wiring Kit for GMC Sierra IV – 7-pin & 13-pin Options

With a vehicle-specific wiring kit for the GMC Sierra IV, you get a reliable, regulation-compliant connection between your vehicle and trailers, bike racks or powered accessories. Our kits are matched to model year, trim and vehicle electronics so lighting, signalling and comfort features work correctly.

Technical features & highlights

Available in either 7-pin or 13-pin versions depending on functionality desired (e.g. permanent power, charge line, trailer reverse lights).
Durable, weather-resistant connectors to protect against moisture, corrosion, and environmental stress.
Optimized cable lengths and mounting points to reduce strain and ensure clean installation.
Compatible with installed driver assistance or comfort systems (rear camera, sensors); in some trims, coding or activation is required.

7-pin vs. 13-pin – which should you choose?

The 7-pin kit is suitable if you only need basic lighting and signal functions like turn indicators, tail lights and brake lights. The 13-pin variant adds features like reverse lighting for trailers, permanent power feed or charge line – ideal for towing with additional electrical load.

Installation & technical guidance

Follow the included instructions carefully – check all connectors, fuses and mounting locations.
Route cables neatly; protect them from abrasion, heat, and water; seal all connector joints.
Mount the socket so it is protected from splash and road debris.
Check for necessary coding or activation when your Sierra is equipped with advanced features.

Why choose Weltmann-KFZ-Teile?

Wiring kits specifically designed for GMC Sierra IV – precise fit and consistent performance.
High-quality materials built to withstand tough environmental conditions.
Reliable stock, fast delivery and expert support especially for special or heavy-duty towing use.

FAQ – Wiring Kit for GMC Sierra IV

Do I need a 13-pin wiring kit?

Yes, if you plan to use features such as trailer reverse lighting, permanent power or a charge line. If you only require lighting and signalling, a 7-pin set is usually enough.

Is coding or activation necessary?

Depends on your trim and factory-installed features. Vehicles with sensors, cameras or advanced electronics may require a module activation or coding.

Can I install the wiring kit myself?

Yes, with proper tools and careful work. Weatherproof connectors, correct fuse sizes and tidy cable routing are essential. If unsure, hiring a specialist is advised.

Will installation affect my warranty?

No – if you use certified, vehicle-specific components and install correctly, your manufacturer warranty will typically remain valid.

Which connector type do I need?

The choice between 7-pin or 13-pin depends on your usage. If you need power, reverse lighting or additional functions for your trailer, go with 13-pin; otherwise 7-pin may be sufficient.

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