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My beetle has a tow hitch attached to the front suspension and it's wired to be towed as a trailer. I'm suspicious that this has impacted the wiring. One of the issues is that when I push on the brakes, the speedometer illuminator light comes comes on as does the lights on the front fenders. The other wierd thing is that one of the tail lights (and brake lights) is brighter than the other one.
In the process of thinking about this, I wanted to know what the connections are on a trailer plug (the wiring that goes from the towing vehicle to the trailer to make the trailer's lights work). I did some searching to find the wiring diagram for a trailer plug. I knew about 4-pin plugs, but apparently there are also 6 and 7 pin plugs. I didn't find one page that had good diagrams of all the different types, but I found a few pages that cover all of them.