Unity Motorhome
Electrical System Operation
1-56
12 Volt DC system
IMPORTANT
A 15 Amp fuse, located in position #10 of the fuse
panel under the driver’s seat, protects the 12 volt DC
charging system. See the chassis operator’s manual
for further details.
Chassis Battery
The chassis battery operates the starter, the vehicle
accessories, and all the controls found on the vehicle
chassis instrument console, such as the auto heater
fans, exterior lights, the horn, speed control, windshield
wipers, etc.
It is recommended that the chassis battery cables be
disconnected when parking the Motorhome for an
extended period of time. See the chassis manual for
chassis battery quick disconnect location.
IMPORTANT
Disconnecting battery cables from the chassis battery
can clear the engine/transmission logic modules.
These modules will re-calibrate themselves once the
vehicle is reconnected and the engine started.
Coach Batteries 12 Volt DC
The coach batteries supply power to all the 12 volt DC
lights and equipment in the living area of your Motorhome,
including the roof vent, refrigerator (when operating in
12 volt DC mode,) 120 volt AC generator starter, water
pump, furnace fan, interior lights, holding tank, water
level gauges, etc.
Coach Battery Condition Meter
Depress the switch (2) and hold to show the battery
voltage level in the system monitor LED display (3)
Battery Maintenance
Automotive batteries are reservoirs of 12 volt DC
electrical energy. Whenever energy is removed from
the battery it has to be replaced in order for the battery
to continue functioning. This energy is restored by the
engine alternator whenever the engine is running or by
the RV converter.
1
2
3
Problems
Two conditions can destroy the function of a battery. One
is called sulphating in which a layer of sulphate crystals
collect on the lead plates inside the battery. This can
happen when a battery is not used for a long period of
time (30 days or more) especially during warm weather.
This situation requires replacement of the battery. The
second is freezing. A battery must be kept at almost full
charge to prevent the liquid electrolyte inside the battery
from freezing.
The 12 volt DC power voltage system in your Motorhome consists of two separate but connected battery systems:
Chassis battery
- (1) located under driver’s side cab floor (not shown).
Coach batteries
- (2) located below a lift-up panel in the coach doorway.
Summary of Contents for 2013 Unity
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Page 10: ...Unity Motorhome Introduction 1 10...
Page 90: ...Unity Motorhome Notes 1 90 Notes...
