Parts Catalog Accessories Catalog Tech Info Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
 >  >
Battery Connection Notes and Replacement
 
Bookmark and Share

Pelican Technical Article:

Battery Connection Notes and Replacement

Nick Czerula

Time:

1 hour1 hr

Tab:

$150

Talent:

**

Tools:

Set of sockets (10mm, 13mm could vary)

Applicable Models:

BMW Z3 (1996-02)

Parts Required:

Battery, battery vent hose

Hot Tip:

Wear eye and hand protection.

Performance Gain:

Car will start well.

Complementary Modification:

Replace battery vent hose
Your BMW Z3 is equipped with a 6-cell, 12-volt lead acid battery. Each cell consists of lead plates in a lattice that is immersed in sulphuric acid (the electrolyte). The chemical reaction between lead and sulphuric acid produces a nominal 2 volts per cell; the six-cells together provide the approximately 12 volts required to operate electrical and electronic components in the vehicle. After the battery is used to start the engine, the alternator (powered via the engine accessory belt) takes over electrical generation and also replenishes the charge that the battery used in starting the engine.

During operation and also during recharging, the chemical reactions in the battery produce heat, which causes the electrolyte (sulphuric acid) to evaporate. The cells in many older batteries are equipped with plastic caps that allow the evaporated electrolyte to escape. If the level of electrolyte drops below the tops of the lead plates the plates can become damaged; also the heat in the battery begins to build excessively at that point. If your battery has removable cell caps, be sure to remove them periodically and inspect the electrolyte level. If the electrolyte is at the same level as the tops of the lead plates, add clean distilled water to the battery.

Most modern lead-acid batteries are sealed so that the evaporated electrolyte cannot escape. However, a charging battery also produces hydrogen. This is discharged from the top of the battery using a small vent tube. Make sure the vent tube is not blocked or damaged and keep in mind that open flames or sparks around a charging battery are a potential source of battery explosion. 

Heat, chemical reactions and electrical charges can cause battery connections to become covered with corrosive and insulating deposits. Any time you remove the battery terminals from the battery, be prepared to clean the metal surfaces with a metal brush. A solution of baking soda and water will neutralize acid deposits and clean the top of the battery and the battery compartment.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches. 

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you are working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Do not work on your vehicle if you feel the task is beyond your ability. 

Vehicle models change and evolve, as they grow older, so the vehicle shown in our illustrations may vary slightly from yours. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

The battery in BMW Z3 models is located in the right side of trunk, under the carpet (green arrow).
Figure 1

The battery in BMW Z3 models is located in the right side of trunk, under the carpet (green arrow). When replacing your battery be sure to use a high quality unit. Replacing the battery can be done in a short amount of time. Read battery connection notes before disconnecting battery. Before disconnecting your battery, remove key from vehicle and store in a safe place and note radio presets. When battery is reconnected or loses its charge the following items may need attention (depending on vehicle equipment): You may have to reset your clock, enter radio presets, initialize power windows and initialize the sunroof.

Charging battery:
You can connect a battery charger directly to the battery or under the hood at the positive (+) and negative (-) grounding point junction.
Figure 2

You can connect a battery charger directly to the battery or under the hood at the positive (+) and negative (-) grounding point junction. The battery junctions are located at right front strut tower. Red Arrow points to battery positive (+). Blue Arrow points to battery negative (-). However, I suggest removing battery from vehicle when charging. This will avoid filling your trunk with gases the battery emits during charging. Follow the manufacturerÂÂÂ's instructions on setting and using the battery charger. Jump Starting vehicle: A vehicle with a discharged battery can be jump started using a good battery or a good battery in another vehicle. When jump starting: Be sure to work in a well ventilated area, batteries can produce an explosive gas. Wear gloves and eye protection and if battery acid comes in contact with your skin, immediately flush with water and seek medical assistance. Move both vehicles close together but do not allow them to touch. Turn ignition OFF in both vehicles.

Unclip and remove positive (+) terminal cover.
Figure 3

Unclip and remove positive (+) terminal cover. (green arrow).

Connect one end of positive jumper cable to positive (+) battery terminal of vehicle with good battery.
Figure 4

Connect one end of positive jumper cable to positive (+) battery terminal of vehicle with good battery. Connect other end of positive jumper cable to positive (+) junction terminal (red arrow) vehicle with discharged battery. You will have to flip open lid on positive (+) junction connection. Connect one end of negative (-) cable to negative (-) battery terminal of vehicle with good battery. Connect other end of negative (-) jumper cable to negative (-) junction terminal (blue arrow) of vehicle with discharged battery. Start engine on vehicle with good battery. Allow to idle, then raise engine to 2000 RPM. Next, start engine of vehicle with discharged battery. Once vehicle with discharged battery starts, shut OFF any electrical accessories, radio, HVAC blower, etc. Carefully disconnect jumper cable in the reverse order you connected them. Allow vehicle with dead battery to idle to recharge the battery.

Replacing battery:
Working in trunk, lift carpet and remove from the trunk by pulling it straight out.
Figure 5

Working in trunk, lift carpet and remove from the trunk by pulling it straight out.

Pull the negative terminal protective cover off the terminal (green arrow).
Figure 6

Pull the negative terminal protective cover off the terminal (green arrow). Then loosen the 10mm nut on the negative (-) battery cable (yellow arrow). Remove the negative cable and place out of the way in a place where it cannot come in contact with the negative terminal while replacing the battery.

Loosen the 10mm battery hold down fastener (green arrow), then remove the battery hold down.
Figure 7

Loosen the 10mm battery hold down fastener (green arrow), then remove the battery hold down.

Pull the positive terminal protective cover off the terminal (green arrow).
Figure 8

Pull the positive terminal protective cover off the terminal (green arrow). Then loosen the 10mm nut on the positive (+) battery cable (yellow arrow). Remove the positive cable and place out of the way in a place where it cannot come in contact with the battery terminal while replacing the battery. Disconnect battery vent hose and lay aside.

Lift battery up and remove from trunk.
Figure 9

Lift battery up and remove from trunk. Be careful and make sure you have a good grip, the battery is quite heavy. Clean battery compartment thoroughly. Clean corrosion from battery cable ends if present.

Before installing new battery, check that battery vent line is not pinched, in good condition and properly routed.
Figure 10

Before installing new battery, check that battery vent line is not pinched, in good condition and properly routed. The vent line (yellow arrow) for the vehicle shown here is too short and will not reach the vent (green arrow) on this battery. An extender kit may be needed to properly vent the battery. Install battery in compartment, attach vent line. Connect positive (+) cable and install cover. Next connect negative (-) cable and install cover. Install battery hold down bracket. Then reinstall trunk carpet.

Bookmark and Share
Comments and Suggestions:
joseph Comments: Hello, My mame is José from Brasil and I intend to buy a BMW Z3 1996. I like this car very much. I was surprised when I saw the battery in the front side of the car, near the motor in the right side where usualy there is an empty space. Acording to the actual owner, this car was made in Germany specialy for the USA. Is it true or not?
April 15, 2016
  Followup from the Pelican Staff: I don't know, I would assume it isn't stock. Check the trunk for a sign of the battery housing and cables. - Nick at Pelican Parts  

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Privacy Statement]
 [Contact Us] [About Us] [Shipping] [Map to our Location] [Careers]

Copyright © Pelican Parts Inc.

Page last updated: Fri 12/9/2016 02:06:49 AM