Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz 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

Steve Vernon

Time:

30 minutes30 mins

Tab:

$0 to $200

Talent:

*

Tools:

13mm socket and extension, 10mm wrench

Applicable Models:

Mercedes-Benz W204 (2008-15)

Parts Required:

Battery

Hot Tip:

Store any aftermarket radio codes you may need

Performance Gain:

Car starts

Complementary Modification:

Change cabin air filter

The battery in the Mercedes W204 is located in the rear right hand side of the engine compartment by the A-pillar and window base and is covered by a plastic air box. 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 and note any radio presets. When a 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.

The battery in the Mercedes W204 is located in the rear right hand side of the engine compartment by the A-pillar and window base and is covered by a plastic air box (red arrow).
Figure 1

The battery in the Mercedes W204 is located in the rear right hand side of the engine compartment by the A-pillar and window base and is covered by a plastic air box (red arrow).

There are three main areas regarding the battery, the battery and cover (red arrow), the power distribution box (yellow arrow) and the ground post for jump-starting (green arrow).
Figure 2

There are three main areas regarding the battery, the battery and cover (red arrow), the power distribution box (yellow arrow) and the ground post for jump-starting (green arrow).

If you need to jump-start your vehicle you do need to directly connect the jumper cable to the battery.
Figure 3

If you need to jump-start your vehicle you do need to directly connect the jumper cable to the battery. When jump-starting: 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 and connect the other end of the positive jumper cable to the positive (+) junction terminal (yellow 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 the negative (-) junction post beside the coolant reservoir (red 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.

The main distribution of power is at the junction or distribution box.
Figure 4

The main distribution of power is at the junction or distribution box. To access this you need to remove the cover by pushing in the four plastic clips and lifting the cover off. The yellow arrow indicates the cover for the positive jump-start terminal.

With the cover off you can see how the power is split and distributed elsewhere in the vehicle (red arrow).
Figure 5

With the cover off you can see how the power is split and distributed elsewhere in the vehicle (red arrow). If you need to perform any work on the box or replace any of the distribution cables make sure to disconnect the battery first.

There are three clips that hold the air box cover on protecting the battery.
Figure 6

There are three clips that hold the air box cover on protecting the battery. Use your hands and unclip the clips and lift the box off.

With the cover off you can see the positive (yellow arrow) and negative (red arrow) posts on the battery.
Figure 7

With the cover off you can see the positive (yellow arrow) and negative (red arrow) posts on the battery. When working on a battery always disconnect the negative post first and place it out of the way somewhere where it cannot accidentally make contact with the post again. Use a 10mm wrench and disconnect the negative post and then the positive.

With both terminals disconnected (negative first) use a 13mm socket with a long extension and remove the two bolts holding the battery hold down in place (red arrows).
Figure 8

With both terminals disconnected (negative first) use a 13mm socket with a long extension and remove the two bolts holding the battery hold down in place (red arrows).

Remove the bolts and the hold down plate from the tray.
Figure 9

Remove the bolts and the hold down plate from the tray.

Carefully lift the battery straight up and out.
Figure 10

Carefully lift the battery straight up and out. It is very heavy so have a strong friend help if needed. Always clean and inspect the battery tray area. If there has been leaked battery acid or rust has started you need to take care of this right away, before you install a new battery. Installation is the reverse of removal.

Bookmark and Share

  Search our site:    

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

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Mon 12/5/2016 03:05:55 AM