I should mention that was with my new car e70. Still it should work I don't know why it didn't. I do have to set the jump pack to boost mode to supply power when battery is lower than 11v and thought i had.

I think the main battery positive is a pass through to the main supply at the back. I'm wondering if there's s disconnect at the positive battery terminal. I just remember being very surprised i couldn't figure out the logic at all.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)