The correct way to jump start any vehicle with battery under hood is connect the positive+ lead from doner battery to the positive terminal on cars battery then connect the negative- lead from doner battery to a convenient earth connection on the engine itself (NOT THE BATTERY ) then try starting? if doner is another car then start doner car and keep slight revs 1500 ? while flat battery car is started ? then disconnect leads from cars in reverse order ie earth/negative lead 1st so not to cause spark from battery hope this helps?
Red is postivie,black is negative, make sure where you are jumping it from is the same, make sure the other vehicle is running
SOURCE: 1998 bmw 740il will not start even with new a battery
If you checked all the fuses try putting the car in neutral sometimes the shifter gets misadjusted and wont start till the car is completely in park.If not check for a lose wire to the starter.If the car has an after market alarm you will have to turn it off before starting there should be a little buuton under the drivers dash or kick panel.GOOD LUCK
SOURCE: 1998 bmw 740il will not start
check battery cables.make sure they are not loose are or corroded.if battery cables okay.problem could be faulty starter - electronic immobilizer control - ignition switch + check its fuse first.if you disconnect battery cables besure to turn off radio so you wont lose code.
SOURCE: i HAVE A 1997 BMW 740IL CAR WONT START JUST MAKES
If the battery is good , then you need a new starter.
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