Airstream 2013 Classic Owner's Manual page 94

ELECTRICAL
Only qualified service centers and technicians should troubleshoot and repair
electrical systems.
Electronic Battery Disconnect Switch (Front Bed Model Only)
The disconnect switch is used to separate the battery from the 12-volt
distribution panel and converter charging system. It is an electronic version of
the manual "Kill" switch.
When the disconnect switch is turned to "use" (on) and the trailer is plugged
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into a 110-volt shoreline, the 12-volt distribution panel will receive power from
the converter as the battery is charged through the converter charging system.
If the trailer is not plugged into a 110-volt shoreline, the battery will supply
12-volts to the trailer and no charging to the battery is available since the
converter is not receiving 110-volt power.
When the disconnect switch is turned to "store" (off) and the trailer is plugged
into a 110-volt shoreline, the 12-volt distribution panel will still receive power
from the converter, but the battery is disconnected from the system. The bat-
tery will not be drained with the switch in the "store" position. The converter
will not charge the battery with the switch in the "store" position either.
The charge in the 12-volt batteries is replenished when towing from the tow
vehicle alternator through the 7-way cord. This charge will go to the battery
no matter which position the Battery Disconnect Switch is in.
BATTERY
The battery (batteries) are located inside battery boxes in the trailer A-frame.
A normal battery can discharge by itself in 30 to 40 days when not in use,
therefore, IT IS NECESSARY TO PERIODICALLY CHECK THE BATTERY AND
CHARGE IT AS IS NECESSARY.
When being towed, the 12-volt battery in your trailer is receiving a constant
charge from the car's generator or alternator through the seven-way connector.
Your tow vehicle's voltage regulator controls the charge rate. It is important to
keep the seven-way connector clean. One method is to use "Spra-Kleen".
Whenever possible use the automatic built in converter system for charging.
The charging circuit automatically controls the current, reducing it as the
battery increases in charge.
At service stations make certain they give your battery a slow charge because
quick charges will drastically shorten the life of the battery, as will allowing
repeated complete discharges.
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