This harness converts 10-pin halogen wiring on MK4 / PQ34 platform vehicles to a 12-pin interface to support OEM Bi-Xenon headlight units. It allows for retrofitting Bi-Xenon headlights where 12-pin Xenon connections are required.
 
Key Features
Adapts factory 10-pin halogen wiring to 12-pin Bi-Xenon headlight connection
Retains primary lighting functions: low beam, high beam, DRL / parking lamps
Uses OEM-match connectors and appropriate wire gauge
Clean, plug-and-play installation (no splicing required)
Designed with durable sleeving and strain relief for reliability
 
Fitment & Compatibility
Intended for MK4 / PQ34 Volkswagen / Jetta / Golf / platform using halogen 10-pin wiring
Only for retrofits to OEM 12-pin Bi-Xenon headlight units
If uncertain about compatibility, send photos of your headlight connector or your VIN, and I’ll verify before you order
 
Why Use This Harness
Aftermarket Bi-Xenon or OEM legacy Bi-Xenon headlights often require a 12-pin input.  MK4 halogen models use 10-pin wiring, which won’t match. This harness fills that gap, letting you use 12-pin Xenon heads without cutting or mismatching your factory loom.