Open the X5 hood. Locate the positive towards the back on the driver side. It is cover with a black + cap. Locate the negative on the body (look for a nut tied to the chassis)
connect the jump wire to the first car. Connect the negative wire to X5, then the positive red clip to the positive. Start the first car (if the battery of X5 is really dead, let the first car run for about 5-10mins. Then start the X5. Remove the jump wire in reverse order. Remove positive first, the negative.
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The BMW owner manual usually gives you this information, but lacking that here is what mine says: Since my BMW's battery is located in the trunk it is not easily accessible. There is a Positive red (+) terminal under a small plastic cover in the engine compartment. Connect one end of the jumper cable to that terminal. Connect the other end directly to a bolt located on the actual engine. This is the Negative (-). It will be located close to the positive terminal. Connect the jumper cable to the other car making sure to connect positive to positive and negative to negative.
Jump it, it will either start or it wont
When you jump start, at first there is only a little charge, and that charge has to go to all electronic features in your car, like the lights, radio, dash
clean the battery terminals with baking soda and water. them jump it
NO! i don't know for sure but you might kill them it's just really stupid if your that desperate just keep doing CPR
The problem could be a number of things. One is that the new battery you installed is faulty and you would need a new battery. i would have a professional check your battery, starting and charging components on your car and make sure they are within spec. If they are all good then I would check for a battery draw on the car. This can be an extremely difficult and expensive problem to find; Suggest having certified BMW service done at this point. Make sure you have all aftermarket electrical stuff disconnected: no aftermarket radio, buzz detectors, nothing, not even anything in your cigarette lighter.