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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:

$10 to $200

Talent:

*

Tools:

13mm wrench

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

New battery

Hot Tip:

Wipe down the inside of the battery tray

Performance Gain:

Car starts

Complementary Modification:

Change cabin air filter

The battery in Porsche 944 is located in the rear right hand side of the engine compartment by the A-pillar and window base. When replacing your battery be 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 on and working safely with your battery is important aspect of fixing things yourself.

Before disconnecting your battery, remove the key from the vehicle and store 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 Porsche 944 is located in the rear right hand side of the engine compartment by the A-pillar and window base.
Figure 1

The battery in Porsche 944 is located in the rear right hand side of the engine compartment by the A-pillar and window base. There was cover for the battery that came with the cars but most of those are long gone.

Do NOT let your battery get to the condition of the one that came in our project car.
Figure 2

Do NOT let your battery get to the condition of the one that came in our project car. The battery was missing the tie down bracket (green arrow) and had eight power leads (red arrow) and three grounds (yellow arrow) attached to it. To remove the battery remove the 13mm nut on the tie down bracket and remove the bracket, then loosen the 13mm nut on the ground cable first (yellow arrow) and remove the cable form the post, then remove the positive cable and remove the battery from the car. Use care as the battery is very heavy and do not let the cables contact the posts while moving it.

With the battery removed clean up the area around the battery tray.
Figure 3

With the battery removed clean up the area around the battery tray. If there is any corrosion or spilled battery acid make sure to take care of it right away. The red arrow indicates the stud the battery tie down bracket and bolt attach to.

Check the ground strap where it mounts to the chassis (red arrow).
Figure 4

Check the ground strap where it mounts to the chassis (red arrow). This area should be free of rust and corrosion and have good metal to metal contact. Clean this area well and apply a little dielectric grease when reinstalling the ground strap. Bad connection between the ground strap and chassis can be a major cause of electrical issues with a vehicle; do not overlook this area.

Check the straps for corrosion (red arrow) and clean or replace as needed.
Figure 5

Check the straps for corrosion (red arrow) and clean or replace as needed.

Install the battery in the compartment; connect the positive (+) cable (yellow arrow).
Figure 6

Install the battery in the compartment; connect the positive (+) cable (yellow arrow). Next, connect the negative (-) cable (red arrow). Install the battery bracket and tighten it down until it is snug.

Battery Charging:
When charging a battery you can connect a battery charger directly to the battery or under the hood at the positive (+) (yellow arrow) and negative (-) (red arrow) grounding point junction.
Figure 7

When charging a battery you can connect a battery charger directly to the battery or under the hood at the positive (+) (yellow arrow) and negative (-) (red arrow) grounding point junction. However, I suggest removing the battery from the vehicle when charging. This will avoid filling your engine bay with gases the battery emits during charging. Follow the manufacturer's instructions on setting and using the battery charger.

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 the area with water and seek medical assistance. Move both vehicles close together but do not allow then to touch. Turn ignition OFF in both vehicles. If there are covers on the batteries begin by removing them so that you can get access to the terminals. Connect one end of positive jumper cable to positive (+) battery terminal of the vehicle with the good battery. Connect the other end of the positive jumper cable to positive (+) junction terminal (yellow arrow) vehicle with the discharged battery. Connect one end of the negative (-) cable to the negative (-) battery terminal of vehicle with good battery. Connect the other end of the negative (-) jumper cable to the negative (-) junction terminal (red arrow) of the vehicle with the discharged battery.

Start the engine on vehicle with good battery. Allow it to idle and then raise the 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 the jumper cable in the reverse order that you connected them. Allow vehicle with dead battery to idle to recharge the battery.

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