Our wiring kits for the Volkswagen Golf IV (Hatchback/Estate) deliver a road-legal trailer-lighting setup. Choose vehicle-specific plug-and-play looms with model-matched connectors or universal kits for special use cases. The result is reliable light functions for trailers, bike racks and light caravans.

7-pin vs 13-pin – choose the right interface

7-pin: Core lighting (indicators, brake/tail). Suits most cargo trailers and many racks.
13-pin: Adds reverse light plus permanent live (Pin 9)/charging line (Pin 10) – recommended for caravans and powered accessories.

Pro tip: If you want headroom for the future, go 13-pin and use adapters when needed.

Golf Mk4 electrics & integration

No full modern CAN-trailer logic like newer models – connections are typically made at the rear lamps; coding is rarely needed.
Bypass relay/module protects factory wiring and offloads switches/relays.
Rear-fog cut-off* can be supported to prevent glare when towing.
PDC logic* (if fitted) and LED retrofit lamps* are considered depending on the kit.

*Feature set depends on the chosen kit and vehicle equipment; see product pages.

Installation notes

Looms follow OEM-like routes and include clear instructions. Ensure a sealed grommet pass-through, protected ground points and a fused permanent live feed (for 13-pin). Confident DIYers can handle the job; otherwise, use a professional workshop.

Why buy from weltmann-KFZteile?

Certified brand quality (E-mark).
Complete kits incl. mounting parts – tailored to Golf IV hatch & estate.
Clear guidance on 7/13-pin, bypass modules, permanent live & cut-off functions.
Fast shipping and expert support.

Conclusion

The right wiring kit for your Volkswagen Golf IV ensures compliant lighting and a durable, clean integration – ideal for daily use and classic-driver projects.

Frequently Asked Questions (FAQ)

Is 7-pin enough or do I need 13-pin?
For basic trailers, 7-pin is sufficient. Choose 13-pin for a reverse light and for consumers powered via permanent/charging lines (caravans).

Do I need ECU coding on the Mk4?
In most cases no. The Mk4 typically connects at the rear lamps without modern CAN trailer recognition. Check each product page for specifics.

What does the bypass relay/module do?
It protects the vehicle’s wiring, reduces load on switches/relays and keeps trailer lighting stable.

How do I supply permanent live (13-pin)?
Run a fused feed from the battery with suitable gauge, routed and protected properly. Many kits include the wiring, fuse and a relay.

Do I need a rear-fog cut-off on the tow car?
Some looms support rear-fog deactivation on the vehicle to avoid glare while towing. See the item details.

Can I install the kit myself?
Yes, if you’re comfortable with electrics. Ensure a sealed pass-through, solid grounds and correct fusing; otherwise, use a professional installer.

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Wiring Kits for Volkswagen Golf IV (Mk4, 1J) – dependable retrofit, tidy hookup