Our wiring kits for the Volkswagen Golf III (Mk3) give you a road-legal trailer lighting setup with either vehicle-specific looms and clear instructions or universal kits. Designed for the Golf’s non-CAN architecture, they’re ideal for small trailers, bike carriers and light caravans.

7-pin or 13-pin – which fits the Mk3 best?

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

Pro tip: Choose 13-pin if you want future flexibility and use adapters when needed.

Golf Mk3 electrics: straightforward & durable

No CAN-bus, usually no coding required – connections are made at the rear lamps.
Bypass relay/module protects the car’s wiring and reduces load on switches and the flasher unit.
Rear-fog cut-off* can be supported to avoid glare when towing.
Ground points and cable gauge must be executed properly; protect all joints against corrosion.

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

Installation notes

Looms follow OEM-like routes and come with clear instructions. Ensure a sealed grommet pass-through, tidy grounds and a fused permanent live feed (13-pin). Skilled 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 the Golf III.
Practical guidance on 7/13-pin, bypass relay, permanent live & rear-fog cut-off.
Fast shipping and expert support.

Conclusion

The right wiring kit for your Volkswagen Golf III delivers compliant lighting and a robust, long-lasting connection – perfect for daily use and classic-car adventures.

Frequently Asked Questions (FAQ)

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

Do I need ECU coding on the Golf Mk3?
No in most cases. The Mk3 has no CAN-bus; wiring connects directly at the rear lamps.

Why use a bypass relay/module?
It offloads the car’s switches and flasher, protects original wiring and keeps trailer lighting stable.

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

Do I need a rear-fog cut-off on the car?
Some kits support rear-fog deactivation on the tow car to prevent glare when towing. Check the product page.

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 III – classic car, simple & reliable hookup