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It's a 7-way trailer & RV plug. Here's the layout: (From the vehicle side) (From the trailer side) Note: Images used from this website. ... no affiliation.


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I had the same isue. Than it hit me. BMW utilizes a smart battery unit device on the positive terminal. It's this device I think contain a relay off sum sort and gets timed out after set interval. I just moved my Oterminal to behind it, and voila... Prob solved Hope that helps guys


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