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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:

$140

Talent:

**

Tools:

13mm socket and extension

Applicable Models:

VW Golf (1999-05)

Parts Required:

Battery

Hot Tip:

Wear eye and hand protection.

Performance Gain:

Car will start better.

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 the 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 (yellow arrow picture 3) 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.

Replacing battery:

The battery has two covers. The larger cover covers the top and sides of the battery. It has two circular plastic push button retaining clips built into the lid; one on each side. Push these in and pull the cover straight up and off the battery.

Disconnect the negative or ground strap and place it somewhere where it cannot come back in contact with the battery.

Disconnect the power strap from the main positive lead going to the fuse panel on the top of the battery.

Under the main cover is the cover for the fuse panel on top of the battery. Squeeze in the two tabs and swing the cover towards the front of the car. Underneath the cover you will see the fuses for the Generator, Interior relay, Coolant Fan and Control Module, Fuel Pump relay and the Secondary Air injector relay. The three smaller fuses are for the Coolant fan, ABS system and the ABS hydraulic Pump. Squeeze in the two plastic clips on each side and swing the fuse panel up and back. Separate the fuse panel from the plastic mount it sits on and tie it back up out of the way.

Remove the main positive cable from the battery.

Remove the 13mm nut and plate on the lower front of the battery that holds the battery in position.

Lift the battery from the car. Use care here as the battery is very heavy and you do not want to drop it or even have it tilt over on its side. With the battery removed unclip the two plastic clips on the plastic surround at the rear of the battery tray.

Remove the tray and unclip the panel that holds the lines for the top fuse box. You know have a clear battery tray area. Clean up any spilled acid to damage to the area.

Installation is the reverse of removal.

The battery has two covers.
Figure 1

The battery has two covers. The larger cover covers the top and sides of the battery (red arrow) with a smaller cover on the fuse box mounted on the battery (yellow arrow).

It has two circular plastic push buttons retaining clips built into the lid; one on each side (yellow arrow, one shown).
Figure 2

It has two circular plastic push buttons retaining clips built into the lid; one on each side (yellow arrow, one shown). Push these in and pull the cover straight up and off the battery.

The battery has a cable attached to each of the two terminals on it.
Figure 3

The battery has a cable attached to each of the two terminals on it. The Positive (yellow arrow) and the Negative or ground cable (red arrow)

Disconnect the negative or ground strap and place it somewhere where it cannot come back in contact with the battery.
Figure 4

Disconnect the negative or ground strap and place it somewhere where it cannot come back in contact with the battery.

Disconnect the power strap from the main positive lead going to the fuse panel on the top of the battery.
Figure 5

Disconnect the power strap from the main positive lead going to the fuse panel on the top of the battery.

Under the main cover is the cover for the fuse panel on top of the battery.
Figure 6

Under the main cover is the cover for the fuse panel on top of the battery. Squeeze in the two tabs (yellow arrows) and swing the cover towards the front of the car.

Underneath the cover you will see the fuses for the Generator (yellow arrow), Interior relay (red arrow), Coolant Fan and Control Module (green arrow), Fuel Pump relay (purple arrow) and the Secondary Air injector relay (blue arrow).
Figure 7

Underneath the cover you will see the fuses for the Generator (yellow arrow), Interior relay (red arrow), Coolant Fan and Control Module (green arrow), Fuel Pump relay (purple arrow) and the Secondary Air injector relay (blue arrow). The three smaller fuses are for the Coolant fan, ABS system and the ABS hydraulic Pump.

Squeeze in the two plastic clips on each side (yellow arrows) and swing the fuse panel up and back.
Figure 8

Squeeze in the two plastic clips on each side (yellow arrows) and swing the fuse panel up and back.

Separate the fuse panel from the plastic mount (red arrow) it sits on and tie it back up out of the way.
Figure 9

Separate the fuse panel from the plastic mount (red arrow) it sits on and tie it back up out of the way.

Remove the main positive cable from the battery.
Figure 10

Remove the main positive cable from the battery.

Remove the 13mm nut and plate (red arrow) on the lower front of the battery that holds the battery in position.
Figure 11

Remove the 13mm nut and plate (red arrow) on the lower front of the battery that holds the battery in position.

Lift the battery from the car.
Figure 12

Lift the battery from the car. Use care here as the battery is very heavy and you do not want to drop it or even have it tilt over on its side. With the battery removed unclip the two plastic clips (yellow arrows) on the plastic surround at the rear of the battery tray

Remove the tray and unclip the panel that holds the lines for the top fuse box (yellow arrow).
Figure 13

Remove the tray and unclip the panel that holds the lines for the top fuse box (yellow arrow). You now have a clear battery tray area. Clean up any spilled acid to damage to the area.

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Page last updated: Mon 12/5/2016 02:33:26 AM