Jump starting a car means using the battery from another running vehicle to power a vehicle with a dead battery. Jump starting a BMW 530i is simple even though the battery is located under the rear passenger seat. BMW equips its vehicles with an auxiliary post connected to the battery and located next to the engine. This post can also be used for jump starting with a booster box.
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Things you need
- Booster box (optional)
- Jump leads
Open the bonnet to access the engine compartment. Locate the auxiliary post for the battery to the right side of the engine. The post will be designated by a "+" symbol.
Pull the cap off the post by hand. This will expose the positive terminal. The negative nut will be located on top of the strut housing. This is a special nut that acts as a ground for the jump leads.
Park the secondary vehicle in front of the BMW. The secondary vehicle can also be parked alongside the driver's side of the vehicle. This will ensure the jump leads will reach from the secondary car to the BMW. Leave the secondary vehicle running. Turn off the headlights, air conditioning and radio on both vehicles.
Open the bonnet to access the secondary vehicle's engine compartment. Locate the battery or auxiliary positive terminal on the secondary vehicle.
Clamp the positive cable onto the positive terminal on the secondary car. Do not let the black clamp touch the red one. This will cause an arc and could be dangerous. Clamp the black cable onto the negative terminal on the battery.
Repeat the process in Step 5 on the BMW. Ensure the red cable goes onto the post on the auxiliary positive terminal. Clamp the black cable onto the nut on the strut housing. This will complete the circuit and allow electrical power to charge the BMW battery.
Attempt to start the BMW. Once the BMW starts, then allow it to idle. If the car does not start up right away, wait for the vehicle to charge from the secondary vehicle for five minutes then attempt to start the car again.
Remove the jump leads from the BMW. Do not allow them to touch. Carefully remove the jump leads from the secondary vehicle. Place the cap over the auxiliary positive terminal and close the bonnet on both cars. Allow the BMW to idle for a few minutes to let the alternator charge the battery.
Shut the car down and allow it to sit for an hour. Attempt to start it to ensure the battery is holding the charge.
Tips and warnings
- Replacement of the battery will involve removal of the back seat. Always use the auxiliary terminals for easy access.
- The same process applies, whether using a booster or battery box.
- Never allow the red and black cables to touch as this will cause an arc. Never let the red cable touch any metal components while the other ends of the cables are connected to the battery. This will also cause an electrical arc.
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