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Sorry, missed your point about the 'control box by the battery'. Why do you believe you have the OEM hitch? Take a look at the .pdf of the installation instructions early in the long DIY trailer hitch installation thread. Compare your hitch, and the 'control box,' to that in the instruction sheet. That will give a start to troubleshooting your setup.
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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.
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