Battery Checking and
To prevent short circuit, the battery must be disconnected prior to working on the electrical system. First remove the ground wire. When re-installing attach the positive wire first.
Never run the engine with the battery disconnected as this immediately results in the destruction of the alternator. This applies also to cars which were later equipped with a main battery switch.
Good engine starting depends on good condition of the battery. Therefore, check its condition regularly. The battery is located in the right corner of the engine compartment, behind the splash wall.
Prior to charging with a quick-charger, disconnect the battery to prevent destruction of the alternator.
The battery capacity decreases, of course, with low outdoor temperatures. Furthermore, higher strain is imposed on the battery during the winter: rear window heating, frequent use of additional lights, blower, windshield wipers, etc. Therefore, special attention should be paid, particularly when driving in city traffic or during shorter trips, to switching off all electrical equipment not absolutely necessary.
Checking electrolyte level
Unscrew all plugs. With the car standing level, the electrolyte level in each cell should reach the filling mark. If the level must be corrected, use distilled water (no acid). Do not fill in more than necessary. In summer and in hot countries, frequent checking of the electrolyte level is advisable.
Checking specific gravity of electrolyte
With a well attended battery, the state of charge can be determined by the specific gravity of the electrolyte. The specific gravity is indicated in g/cm3 and measured with a gravity meter (aerometer).
Testing battery voltage
We recommend that the battery voltage be tested by an authorized dealer who has the proper equipment.
Battery terminals must be clean. Protect them with an acid-binding special grease and check the electrode terminals for tight fitting.
Check the cell caps for tight fitting; the vent caps must not be plugged by dirt or dust. Spilled electrolyte must be rinsed off at once from clothes or metal, using a solution of soda.
Explosion hazard! Do not expose the battery to an open frame or right.
Even if you do not drive your Porsche over a longer period of time, the battery will discharge. To maintain its usability, the battery must be charged every 6 weeks because a discharged battery is liable to suffer from permanent damages. When checking, also check the electrolyte level and replenish if necessary.