Got it, I thought you were talking about a different part of the car, in my case, I have a diesel truck, I hook it up to the x, and that way I get a constant 13.8, even if I go for an hour, beats the expensive charger. the question is, what if the dis/sss version I have is older, and I don't have the latest upgrades???
thanks again!

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2012
E70
3.0 Diesel
18K miles