SOURCE: I have a 1988 BMW
I usually jack up the car and use a pair of jumper cables. Connect the red cable to the starter lead that the battery cable attaches to and the black cable to any good body ground. Connect the other ends of the jumper cables to a good hot battery. Use jack stands for saftey reasons. Be careful and good luck. It always works for me.
SOURCE: Locked out
Connect jumper cables to the starter connection which should be visible under the car, hot to the bolted battery cable connection, negative to any ground. Connect the other end to a battery after you have crawled out from under the car. Also consider; my BMW had the battery in the trunk, which should open with a key.
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I have a 92 735i, the battery is now dead and i am only able to get into the trunk. I have tried turning the key to disengage the doble locking but have had no luck. I need to know how I can enter my vehicle and replace the battery with out breaking a windo0w. I was told a locksmith cant access it either due to the double locking being engaged
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