How to connect jumper cables to bmw

Where do you ground jumper cables on a BMW?

Attach the red jumper cables first. Start by clamping one red cable to the positive side of the battery that won’t start. Then attach the other red clamp to the positive side of the working battery. Next, clamp one black cable to the negative side of the working battery.

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What is the correct order to attach jumper cables?

Now that both models are in position, here’s how to jumpstart a BMW: Remove the covering from both batteries and identify the positive and negative terminals on each. Attach the first red clamp to your BMW vehicle’s red (positive/+) terminal. Hook up the second red clamp to the positive terminal on the working battery.

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Can you use jump leads on a BMW?

Never connect the black cable to the negative (?) terminal on your dead battery. This is very dangerous, could result in a possible explosion. Make sure you follow the instructions in your owner’s manual when jumpstarting your vehicle.

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Where is the negative terminal in a BMW?

During cold start, the first battery is used to power the starter (smaller 50mah battery) while the larger battery heats up the e-CAT and all else electronics.

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Why do BMWS have two batteries?

When you reverse the polarity of the jumper cables, you create a drastic increase in the amount of electrical current that runs through them. As a result, the cables may melt or even catch fire.

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What happens when you hook up jumper cables wrong?

?Positive first, then negative. When disconnecting the cables from the old battery, disconnect the negative first, then the positive. Connect the new battery in the reverse order, positive then negative.?

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Where is the positive and negative on a BMW?

The negative () cable is the ground cable; it is always connected to the frame or body metal and can safely be disconnected first with no chance of causing sparks. By the same token, always reconnect the positive cable before connecting the negative cable.

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