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Re: positive battery cable
You must make sure the connection is clean and tight. Chip away any corrosion, which can sometimes be hard and crusty. Make sure the cable is not frayed or a significant amount of individual strands of copper broken at the terminal connector.
Make sure your alternator is working and you are not running your car on the battery. Measure the voltage while the car is running, it should be around 14 volts.
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The battery for your car is located in the trunk. There are jumper terminals located under the hood in the front of your car. There is a Red (+) terminal that is under a little black cover on the passenger side of the engine bay near the firewall. Right near that is a silver/gray bolt that is bolted to the frame of the car. This is the negative terminal.
Make sure both cars are and all accessories are off: 1) Connect the Postive cable to the dead battery 2) Connect the Positive cable to the good (BMW) terminal 3) Connect the Negative cable to the good (BMW) terminal 4) Connect the Negative cable to the dead battery 5) Start the BMW. (if you have 2 people then gently rev the engine) 6) Start the dead car. 7) Let both cars idle for a while before disconnecting any cables 8) Remove in the opposite order.
I just did this yesterday for an M3...
pull the stereo out of the dash far enough to read the serial number... call the dealership and they will look it up free of charge and give you the code... write it on the radoi for future reference...
most new BMW's the fuse block is located behind the glove box. There should be a pair of twist plastic fastners at the back of the glove box, twist and remove the plate and you should find the fuse box and fuse locater list.
You need to perform a static discharge on the vehicle. Remove both cables from the battery and touch the two cable ends together(you may need a jumper wire) for a few minutes. Reconnect the cables to the battery and check it out.