12-Volt Dc (Direct Current) System; Batteries, Chassis And Auxiliary - Jayco Greyhawk Owner's Manual

12-Volt DC (Direct Current) System

NOTE: The motorhome master battery switch MUST be on before any 12-volt device will
operate.
Included in your load center is a converter which transforms 120-volt AC energy into 12-volt DC
energy to supply your motorhome. When 120-volt AC power is supplied to the power center through
the main circuit breaker in "ON" position, the converter will produce 12-volt DC power to the
motorhome as long as the auxiliary battery is properly connected.
Electric components are sensitive to heat and a converter will produce heat. Ventilation is required
for proper operation. Also, a fan is built into the converter to assist air movement and temperature
control. If normal ventilation is obstructed and the fan is not able to control the temperature, a
protective "Thermal Breaker" will trip the 120-volt AC power to the converter. After the converter
cools down, the breaker will reset automatically and 12-volt DC power will be restored through the
converter.
Replaceable fuses are used to protect the 12-volt DC components. If fuses continue to blow, it is an
indictation that a circuit is overloaded or there is a "shorted circuit." Contact your Independent
Jayco dealer for assistance.
A separate 12-volt fuse panel supplies power to your chassis. Consult the chassis manual for
assistance.
When 120-volt AC power is supplied to the converter through a direct connection at the campsite,
the converter will supply 12-volt DC power to the auxiliary battery automatically.
The auxiliary battery will also receive a charge from the alternator when the engine is running.

Batteries, Chassis and Auxiliary

Each motorhome chassis is built with a battery to provide energy to start the engine and supply
energy for other components in the chassis. This battery is located under the hood. Ford Motor Co.
uses a "Motorcraft" battery, serviced and warranted by Ford.
An auxiliary battery is included in each motorhome for storage power when 120-volt energy is not
available. When drawing energy from storage battery, remember there is limited power available
until the battery needs to be recharged. This auxiliary battery is located in the "house portion" of
your motorhome. All auxiliary batteries require an "in-line" fuse or a 12-volt breaker placed within
18" of battery for your protection.
Maintenance is a normal requirement on all batteries for maximum performance.
1. Keep all terminals clean and tight.
2. Keep the battery filled with water as cells without water cannot hold a charge of energy. A
battery used in daily operation will consume water.
3. The charging system must be in good operating condition to maintain your battery.
Preparation of battery(ies) for winter storage must be carefully considered, especially the auxiliary
battery. Components attached to either battery will discharge the battery in one to three months.
Discharged batteries are subject to freezing, breaking and permanent damage. If you are storing your
motorhome for an extended period, it is important to charge the battery(ies) every thirty days to
maintain a charged condition at 1.265 specific gravity. Disconnect and/or remove the battery to
prevent minor amp draw. If removed, store the battery in a cool, dry place and maintain charge. The
positive cable must be protected from contacting metal surfaces.
56 Type C Owner's Manual