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Battery Connection Notes and Replacement
 
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Pelican Technical Article:

Battery Connection Notes and Replacement

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0 to $200

Talent:

*

Tools:

13mm, 10mm wrench

Applicable Models:

BMW E10 2002 Coupe/Conv (1967-76)
BMW E10 2002tii Coupe (1971-74)
BMW E21 320i Coupe (1977-83)

Parts Required:

Battery

Hot Tip:

Store any aftermarket radio codes you may need

Performance Gain:

Car starts

Complementary Modification:

Change air filter

The battery for the BMW 2002 is located in the front left corner of the engine bay. When replacing your battery make sure to use a high quality unit; they tend to last longer than the cheaper ones. Replacing the battery is easy and can usually be done in less than 30 minutes. This is a great job to start your DIY journey. Working safely with your battery is an important aspect of fixing things yourself.

Before disconnecting your battery, remove the key from the vehicle and store it in a safe place. Note any radio presets. When a battery is reconnected or loses its charge you may have to reset your stereo and clock (if equipped).

The battery for the BMW 2002 is located in the front left corner of the engine bay (red arrow).
Figure 1

The battery for the BMW 2002 is located in the front left corner of the engine bay (red arrow).

If you need to jumpstart your vehicle you do need to directly connect the jumper cable to the battery.
Figure 2

If you need to jumpstart your vehicle you do need to directly connect the jumper cable to the battery. When jumpstarting: Be sure to work in a well-ventilated area. Batteries can produce an explosive gas. Wear gloves and eye protection. If battery acid comes in contact with your skin, immediately flush the area with water and seek medical assistance. Move both vehicles close together but do not allow them to touch. Turn the ignition OFF in both vehicles. Connect one end of the positive jumper cable to the positive (+) battery terminal of the vehicle with the good battery. Slide back the protective cover (if equipped) and connect the other end of the positive jumper cable to the positive (+) junction terminal (red arrow). Connect one end of the negative (-) cable to the negative (-) battery terminal of the vehicle with the good battery. Connect the other end of the negative (-) jumper cable to a known good ground on the chassis (yellow arrow). Start the engine on the vehicle with the good battery. Allow it to idle and then raise the engine to 2000 RPM. Next, start the engine of the vehicle with the discharged battery. Once the vehicle with the discharged battery starts, shut OFF any electrical accessories, radio, HVAC blower, etc. Carefully disconnect the jumper cable in the reverse order that you connected them. Allow the vehicle with the dead battery to idle to recharge the battery.

If you are replacing the battery there are three areas you will need to work on: the ground strap (red arrow), the positive strap (yellow arrow) and the bracket that holds the battery in place (green arrow).
Figure 3

If you are replacing the battery there are three areas you will need to work on: the ground strap (red arrow), the positive strap (yellow arrow) and the bracket that holds the battery in place (green arrow).

The battery is grounded in two places from the battery, to the chassis (red arrow) and to the engine block up under the intake manifold (yellow arrow).
Figure 4

The battery is grounded in two places from the battery, to the chassis (red arrow) and to the engine block up under the intake manifold (yellow arrow).

If you are removing the battery or want to disconnect it to make it safe to work on the electronics like the starter or alternator, use a 13mm wrench and remove the ground strap from the negative post on the battery (red arrow).
Figure 5

If you are removing the battery or want to disconnect it to make it safe to work on the electronics like the starter or alternator, use a 13mm wrench and remove the ground strap from the negative post on the battery (red arrow). Always set the strap in a position that it cannot accidentally come in contact with the negative post while working.

Next, remove the positive strap from the positive post on the battery with a 13mm wrench (red arrow) and set it aside.
Figure 6

Next, remove the positive strap from the positive post on the battery with a 13mm wrench (red arrow) and set it aside.

If your battery has a drain tube disconnect the drain hose from it (red arrow).
Figure 7

If your battery has a drain tube disconnect the drain hose from it (red arrow). Note how the positive strap terminal is wrapped in electrical tape. We did this because our project car happens to be the Clarion Build's BMW 2002, and I did not want the metal end scratching anything in the engine bay. This is also a good idea if you have a capacitor in your stereo system that will discharge from the positive cable if it comes in contact with metal.

There is a bracket on the bottom of the battery tray that holds the battery down (red arrow).
Figure 8

There is a bracket on the bottom of the battery tray that holds the battery down (red arrow). Use a 10mm wrench and remove the long hold down bolt.

Remove the bolt and bracket from the vehicle.
Figure 9

Remove the bolt and bracket from the vehicle. Carefully lift the battery from the engine compartment making sure to hold it upright and level. The battery is heavy, and if you have any concerns about lifting it get a friend to help.

Before installing the new battery make sure to the check the condition of the tray (red arrow).
Figure 10

Before installing the new battery make sure to the check the condition of the tray (red arrow). If the tray has any acid damage, use some baking soda to neutralize it. Better yet remove it, clean it and repaint it. Installation is the reverse of removal.

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Page last updated: Sat 12/3/2016 02:58:44 AM