FOUR WINDS INTERNATIONAL 2007 Presidio, Owner'S Manual, Page: 117 / 173

PRESIDIO
• Repeat the process for each individual cell. The specific gravity reading should not
have a difference of more that 30 "points" (.030) between the lowest and highest
reading or 10 "points" (.010) below the battery manufacturer's recommended
temperature value with the battery fully charged. If so, try and equalize the battery by
following the battery manufacturer's procedures. If equalizing does not help, replace
the battery. You can determine the battery's state-of-charge by taking the average of
the temperature compensated cell readings.
• Thoroughly rinse the hydrometer with water after using it.
3. Keep the battery clean. Corroded terminals make poor contact and do not allow the
chassis alternator or the converter to bring the battery up to full charge.
Battery sulfation occurs when the battery has been standing in a discharged condition
over a long period of time, or when the battery has been operated continually in a state
of partial discharge. Use a baking soda solution to neutralize the acid accumulations on
the battery top. Do not allow the soda solution to enter the battery. Make sure the vent
caps are secure. Flush with water. Thoroughly dry all cables and terminals, reinstall,
and use a plastic ignition spray to protect the terminals.
4. Check the outside condition of the battery. Look for cracks in the case or vent plugs.
If the case is cracked, the battery must be replaced. If the vent plugs are cracked, they
must be replaced.
5. Watch for overcharging. Three ways to spot overcharging are:
• Active material on the vent cap (heavy deposit of black lead-like material on the
underside of the vent cap).
• Excessive use of water.
• By testing voltage regulator output.
6. Make sure the battery hold downs and carrier are kept clean and free of corrosion.
When removing a battery, disconnect the battery ground terminal first. When installing a
battery, always connect the grounded terminal last. When a battery needs to be replaced, make
sure to replace it with a battery of the same characteristics as the original equipment. Consult
your dealer for advice on battery replacement.
NOTE: The coach battery disconnect must be in the ON position in order to charge the
batteries.
NOTE: Deep cycle batteries require a slow charge, resulting in charge times which may exceed
18 hours. When charging the deep cycle batteries, use shore power and allow the inverter to
charge the batteries to a full charge.
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ELECTRICAL SYSTEMS