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Battery Connection Notes and Replacement
 
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Pelican Technical Article:

Battery Connection Notes and Replacement

Steve Vernon

Time:

1 hour1 hr

Tab:

$100

Talent:

*

Tools:

10mm, 13mm socket and extension

Applicable Models:

VW GTI (2006-09)

Parts Required:

Battery

Hot Tip:

Wear eye and hand protection.

Performance Gain:

Car will start well.

Complementary Modification:

Purchase extra emergency fuses

Batteries in modern cars and an integral part of not only the engine management system but also heavily involved in both the computers and security systems. Having a properly charged and maintained battery is crucial to the operation of the vehicle. Unlike older cars where the main power lead of the battery would go directly to the fuse box and starter modern cars have moved to including main or heavy load fuses in the battery area. This also makes trouble shooting easier and more efficient. You should check your fuses first if you are having electrical problems.

The next item to check is the voltage at the battery. Before performing any tests of your alternator, charge and test your battery. If the battery is faulty, your alternator tests will not be accurate. This should read a little more than 12 volts with the engine off. Next check the voltage of your charging system under load, the voltage should be within 13.2: 14.5 volts d/c. To load, have engine running at idle, turn on headlights and HVAC blower motor. Never disconnect a battery cable while engine is running to test alternator, you may cause damage to alternator or other electrical components from the surge in amperage. If your battery appears to be leaking, then your voltage regulator has probably failed.

The battery will usually only leak acid if it has been overcharged at a much higher voltage. If the voltage measured at the battery is more than 14.5 volts when the engine is running, then the regulator is probably bad. If your battery has boiled over and has acid overflowing out the top, make sure that you clean up any spilled acid immediately. Dousing the area with a water and baking soda solution should help considerably to neutralize the acid, and prevent it from eating away at the metal.

As important as the positive side of the battery is to supplying the correct voltage the negative or grounds are an integral part of the system. There are main grounds found in all of the cars systems and sub systems and a bad ground in any of them can cause problems. When checking for electrical problems the grounds and ground straps are a great place to start. NEVER disconnect your ground strap with the engine running; you can severely damage electrical systems in your car,

Before disconnecting your battery, remove key from vehicle and store in a safe place and note radio presets. You may have to reset your clock, enter radio presets, initialize power windows, initialize the sunroof and normalize the steering angle sensor. Once your battery has been replaced, you will have to register the new battery with the vehicle computer system. This tells the DME the age and health of battery to ensure proper charging.

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 then to touch. Turn ignition OFF in both vehicles.

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. 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 (red arrow, picture 3) of vehicle with discharged battery if the main battery ground strap is in good working order.

Start engine on vehicle with a good battery. Allow to idle, then raise engine to 2000 RPM. Next, start engine of vehicle with discharged battery. Once vehicle with discharged vehicle starts, shut OFF any electrical accessories, radio, HVAC blower, etc. Carefully disconnect jumper cable in the reverse order you connected them in. Allow vehicle with dead battery to idle to recharge the battery.

Long term storage and trickle charge:

If you are going to long term trickle charge your battery it is a good idea to remove it from the car.

The battery and cover are located on the left side of the engine compartment (red arrow), the main fuse, relay and distribution box is located beside it (yellow arrow).
Figure 1

The battery and cover are located on the left side of the engine compartment (red arrow), the main fuse, relay and distribution box is located beside it (yellow arrow).

To remove the battery cover, push in on the tab at the front top of the cover (red arrow).
Figure 2

To remove the battery cover, push in on the tab at the front top of the cover (red arrow).

To remove the fuse and relay cover, slide the two clips (red arrows) towards the front of the car and pull the cover up and off.
Figure 3

To remove the fuse and relay cover, slide the two clips (red arrows) towards the front of the car and pull the cover up and off.

With the relay and fuse cover off you can see the main fuse and relay panel (yellow arrow).
Figure 4

With the relay and fuse cover off you can see the main fuse and relay panel (yellow arrow). To remove the front battery cover, push in on the two tabs (red arrows) located at the base of the cover.

Remove the ground strap from the battery terminal (red arrow) and set it in a manner that it can not accidentally make contact with the battery while you are working.
Figure 5

Remove the ground strap from the battery terminal (red arrow) and set it in a manner that it can not accidentally make contact with the battery while you are working. Do not disconnect the battery ground strap from the vehicle (yellow arrow) unless replacing strap or cleaning ground contact.

To remove the battery, remove the 13mm bolt and clamping plate at the base of the battery (red arrow).
Figure 6

To remove the battery, remove the 13mm bolt and clamping plate at the base of the battery (red arrow).

Make sure you place the plate and bolt (red arrow) in a safe place as you will need to reinstall it when replacing the battery.
Figure 7

Make sure you place the plate and bolt (red arrow) in a safe place as you will need to reinstall it when replacing the battery.

To remove the battery tray, remove the three 13mm bolts (red arrows, one already removed).
Figure 8

To remove the battery tray, remove the three 13mm bolts (red arrows, one already removed).

Slide the tray out from the engine compartment.
Figure 9

Slide the tray out from the engine compartment. With the tray gone you will have access to perform functions like replacing your motor mounts. Installation is the reverse of removal.

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Page last updated: Fri 12/9/2016 02:36:03 AM