120-volt AUTOMATIC SWITCH OVER BOX
The switch over box automatically switches the
110 volt feed to the Energy Management System
Module from shoreline to generator and back as
your choose which way to power the motorhome.
You simply decide whether to plug into a 120-volt
shoreline or start the generator and the box will
do the rest. If the generator is accidentally started
while plugged into shoreline the box will sense the generator incoming power,
contact points inside the box will switch cutting the shoreline connection, and
establishing the generator connection. This protects the system from a pos-
sible overload from dual power sources.
Generator/City Power
A. To Energy Management System module main breaker
B. From generator
C. From shoreline
1. When plugged into shoreline power, the current path is from C to A.
2. When you start your generator, the points switch and the power flow is
from B to A. Stopping the generator releases the points back to shoreline
feed.
3. If you’re plugged into shoreline and you start the generator, the points still
switch since the generator has the priority, so the current flow is still B to A.
12-VOLT SYSTEM
IMPORTANT NOTE: MAKE SURE TO READ AND UNDERSTAND ALL ELEC-
TRICAL COMPONENT OWNER’S MANUALS PROVIDED IN THE OWNER’S
PACKET BEFORE OPERATING THE MOTORHOME. Observe all operating
instructions and warnings as well as all recommended maintenance sched-
ules and procedures.
The major portion of electrical power in your Airstream is 12-volt. The 12-volt
current powers just about every thing except for the roof air conditioner, water
heater, 110 volt receptacles, and microwave oven. Even some of these appli-
ances have electronic boards powered by 12 volt.
All 12-volt current is routed to a 12 volt pass-through power stud mounted on
the battery box. The power stud is the hub of the 12 volt system. It ties together
the inverter/charger, house battery, and battery separator.
Power from the stud goes to a buss bar with four breaker positions holding
three Type 2 thermal breakers. The thermal breakers feed the rear lounge motor,
A
B
C
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