Re: Wiring Harness for a 1951 Packard 200 Deluxe

Posted by Owen_Dyneto On 2011/1/10 19:27:50

Another very meaningful way to testing a battery is to check the specific gravity of the sulfuric acid with a battery hydrometer. A reading of 1.275 in all cells indicates a sound, fully charged battery. Any cell that refuses to rise to this level with repeated charging has sulfated and is probably NG.

The sulfuric acid is about 18%, enough to warrant care, safety goggles imperative and gloves recommended.