Instructions to Wire a 4-Way Trailer Connector on a 3 Wire System for a 2007 Volkswagen GTI

Question:

Do you have any information on what type of wire system a 2007 vw gti mkv has? Is it 2 wire or 3 wire. Do you have a wire diagram of what wire is what so I can properly wire the hitch harness. Thank

asked by: Kevin C

Expert Reply:

The 2007 V-dub GTI has a 3 wire system and requires an upgraded, circuit protected modulite to protect the vehicles sensitive wiring. You would use Tekonsha Wiring, # 119250KIT. I have included a link to the instruction below, but there are some supplemental instructions you will need for your specific vehicle which I have included here and as a link below.

Tail Light and Brake Functions:
With a test light, probe the wires behind the vehicles taillight until you locate the wire that contains both the tail and brake functions at 12 volt. Attach the Red (Stop) wire from the 119250 unit to wire pointed out below.

Note: Two wires provide taillight and brake functions:

DO NOT USE the wire where you get pulses of the tail function: (A) Turn - 12V, (B) Brake - 12V, and (C) Taillight - PWM.

USE (A) Brake - 12V and (B) Tail Lights - 12V.

Ground the Brown (Tail Light) and White wires from 119250 (as mentioned in the 119250 instructions for the Mercedes; Step 9, 3-wire system, part c).

Turn Light Functions: Isolated turn signals cannot be found at rear of vehicle, so both the Yellow wire (Left Turn) and Green wire (Right Turn) must be run to the front of the vehicle, along with the Black wire (Battery +). Connections for turn signals must be found at the headlight assemblies.