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      06-04-2017, 11:16 AM   #4
ncnmra
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Canada
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Drives: 2006 M Roadster
Join Date: Jul 2012
Location: Canada

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I generally agree but there is one thing I don't understand. In the moment, I tried boosting the car at both the battery and also under the hood. With the battery disconnected, I couldn't even get the booster to power the electrics (completely dead).

I tried again this AM when I went to check that the car made it to the shop. Same thing, tryinf both a booster and a known good battery, I couldn't get any life out of the car (i.e.: door locks) with the negative of the battery in the trunk disconnected. However when I reconnected the trunk battery, I could operate the doors. What am I missing? Shouldn't I be able to boost the car with the battery completely removed? I thought if I apply a good battery to the positive post and the chassis, it should work, but I got NOTHING.
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