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Mine is a 2014 F02 750li. I checked just now, started it up and got steady 15.1 volts at the underhood terminals. Let it finish warming up to check the oil level, and then got 14.97V steady. My terminal is barely warm to the touch - I can press a finger to it indefinitely. Sorry you're dealing with this. It seems like it has to be a high resistance spot in the current path at or very near the terminal. You've checked the terminal itself, so wondering if one or the other cable could be going bad. But the fact you're seeing 15V at the jumper terminal makes it unlikely there's much voltage drop between alternator and this terminal. So maybe it's the cable on the other side of terminal from alternator connection. It would help if I had a wiring diagram, but I don't. Sorry.
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