Thread: Pictures of Trailer Hitch and Spare Tire Storage Area
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      11-26-2008, 11:09 PM   #14
chuck92103
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Drives: 2011 535i
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Quote:
Originally Posted by xDrive50i View Post
I've seen both types, but on different types of trailers.
Yeah I read up. The basic 4 pin is for small trailers. The 7 pin is for additional running lights and e-brake.
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