Whittaker 299, Owner'S Manual

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4.1.2 CONTINUED
The engine alternator is the normal source for battery charging.
Functioning through a voltage regulator the current output is
automatically adjusted to the needs of the battery and the
demand on the system. The rate of battery charging or
discharging is indicated on the Battery Condition Indicator. If
the amp light on the engine instrument panel is on or the amp
meter indicates a discharge condition with the engine running
and all accessories off, then the alternator circuit is not
functioning properly.
4.1.3
BATTERY MAINTENANCE
When charging, the lead-acid storage battery converts electrical
energy to chemical energy. This energy is stored and released
when needed by discharging, i.e. converting the chemical energy
back into electrical energy. A potential for electrical energy
is set up between the positive and negative battery plates which
are interconnected by an electrolyte of sulfuric acid and water.
The nature of this electrolyte corresponds to the state of
battery charge in such a manner that when discharged the
electrolyte is mainly water. Since the density or specific
gravity of water and sulfuric acid are different, a measure of
the specific gravity obtained by a hydrometer gives an accurate
indication of the state of charge. Therefore, it is recommended
that specific gravity measurements be made periodically. As a
general guide the normal range for full charge is between 1.220
and 1.280. For maximum battery life the following care is
recommended. First, maintain a constant level of charge
(checking with the hydrometer) rather than allowing it to run
down repeatedly with the need for excessive recharges. This can
be accomplished by normal operation or the use of a battery
charger if the battery will remain idle for extended periods.
Maintain the electrolyte above the plates by adding water to
replace that which has been lost through evaporation. Keep the
battery clean, particularly the terminals. After scraping
corroded areas away from the terminals and battery posts, wipe
them clean with a baking soda water solution. After reconnecting
terminals protect them with a light layer of grease or gasket
compound such as "Permatex".
The batteries are located under the forward end of the quarter
berth, and can be serviced by lifting the access hatch in this
berth.
4.2 OPERATION OF 12 VOLT D.C. ELECTRICAL SYSTEM
Accessory loads may be selected as desired by indexing the
appropriate panel breakers to ON" so current may flow from the