15-26 ELECTRICAL SYSTEM
Look for sediment [A] and white sulfation [B] inside the
cells on the bottom of the plates.
See the Battery Troubleshooting Guide in Battery Test
If the specific gravity is below 1.200, the battery needs to
The specific gravity of the electrolyte varies with
changes in temperature, so the specific gravity reading
must be corrected for the temperature of the electrolyte.
Celsius: Add 0.007 points to reading for each 10°C
above 20°C or subtract 0.007 points for each 10°C be-
Fahrenheit: Add 0.004 points to reading for each 10°F
above 68°F or subtract 0.004 points for each 10°F be-
If the specific gravity of any of the cells is more than 0.050
away from any other reading, the battery will probably not
accept a charge. It is generally best to replace a battery
in this condition.
If the specific gravity of all the cells is 1.230 or more, the
battery is fully charged.
Battery Initial Charging
Before being placed in service, a new battery should be
given an initial charging.
Cut off the sealed end of the battery vent hose and re-
move the filler caps.
Fill each cell to the upper level line on the battery case
with fresh electrolyte at a temperature of 30°C (86°F) or
less. Let the battery stand for about 30 minutes before