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Essentially, it is a 4-way wire that connects and provides lighting to the tow vehicle. This type of trailer wire is commonly referred to as the 4 core trailer wire. Unfortunately, most people often choose the wrong type of wire because they know little about four-wire trailer wiring. Once you ascertain the problem, you have to ensure that you don’t escalate the situation by choosing the wrong wire. If you own a trailer or any other type of automobile, you certainly understand all the challenges associated with diagnosing wiring problems. Nowadays, trailer wiring is without a doubt the most vilified facet of trailer mechanics. So the design team looks clean on this one, if you have the towing package and no connector, it is a defect.4 Wire Trailer Wire: Fundamentals And Expert Guidelines On Wiring A TrailerĪ 4 wire trailer wire is an integral part of any trailer’s electrical structure especially, the braking and safety systems. All of them show a similar setup with a brake controller connector. R I checked the schematics for 2007, 2007 Tourareg 2, and 2008 Touareg 2. You should use the heavier wire from the 000 979 302 kit, but you really only need it to terminal 2.
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Is this likely? No, you would have to have a fault in the brake controller that allowed high current, but not high enough to blow the fuse. In other words, the fuse should blow before the wire melts. Why? Wires should be sized to carry all the current available until the fuse blows. It should not be connected to a 2.5mm2 wire. The Red/Yellow wire with power is sized at 4mm2. The schematic shows the wire gauge in mm2. R Whoever said the 000 979 228 wires recommend by Tekonsha are too small was technically right. The ZVW 808 004 kit probably solves this by some resistors to ground to draw more current. R The LED problems looks like the J345 controller just being confused by the trailer LEDs low current. R Since the anti-sway control (if there) would work by sending a signal down the brake signal before you apply the brakes, for the anti-sway control to work one needs to have some level of “boost” set on the controller to send something to the trailer when there is no deceleration. The brake controllers were made by both Hella and Westfalia so this might explain why some have this problem and some don’t R There was no good reason I can see for CAN or other low level signals to be on the brake signal line. R The brake controller sees the real current to the trailer brakes, there is nothing in the way so what the brake controller measures is real R A system like MaxBrake that takes it’s signal from measuring brake line pressure could not get the anti-sway control function If this happened, you would see the brake controller light up without hitting the brakes. R If the Towing Control Module has an anti-sway function, it would send a brake signal to the Brake controller when sway is detected by the stability control module. This schematic has a number of implications: Note there are more pages to this which show more inputs and outputs into the Towing Control Module. The brake controller output is delivered directly over to the 7-pin connector. First, you can see that the brake signal to the brake controller comes from the Towing Control Module (J345). The areas outlined in dashes are where the 7-pin trailer connection and brake controller get added.
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Attached is the schematic for the 2006 Touareg trailer wiring. Don’t read any further if you would prefer to leave the Touareg’s trailer braking control as a mysterious puzzle.