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(12.0 + 3.0) 15.0 amps per hour. This does not include any 12-volt lights, or any other 12-
volt component. If the furnace and refrigerator in this example operated constantly, a 75
amp-hour battery would become fully discharged in 5 hours.
The auxiliary battery should be installed in parallel with the battery in your tow vehicle.
When the 7-way trailer plug is connected, both batteries power the RV. Do not allow it to
discharge your tow vehicle battery below the level required to start the engine. To prevent
this from occurring, disconnect the 7-way trailer plug or install a battery isolator. When the
tow vehicle engine is operating with the RV connected, the tow vehicle charging system will
charge both batteries.
Replacement and Maintenance
Some equipment in your RV will draw small amounts of current even when turned OFF. To
prevent the auxiliary battery from being discharged when your RV is not connected to shore
line power, disconnect the auxiliary battery negative cable at the battery. During storage, it is
important to check the voltage monthly and recharge the auxiliary battery as needed. If you
remove the auxiliary battery from your RV, store it in a dry, cool area per the manufacturer's
instructions.
When it is time to replace the auxiliary battery, Group 27 or Group 31 true deep cycle
batteries are recommended to increase run time of electrical components while dry
camping (operating solely on battery power).
Do not reverse the positive and negative battery cables (doing so will blow the reverse polar-
ity fuse(s) that protect the converter).
For more information
Please contact the battery manufacturer for additional information on the auxiliary batteries.
Battery Isolator For Your Tow Vehicle (customer supplied)
You may want to consider the installation of a battery isolator on your tow vehicle as a
convenience feature:
It receives current from the tow vehicle alternator and controls distribution of
energy to both the RV auxiliary battery and the tow vehicle battery.
It serves as a check valve to prevent energy from being drawn from your tow ve-
hicle chassis battery (so you can start your tow vehicle engine).
Your dealer can assist you with the selection, purchase and installation.
Battery Disconnect Switch (if so equipped)
The Battery Disconnect switch is typically located in an enclosed
exterior compartment. The style of the disconnect switch may
vary per model. This switch does not shut off all power, but only
shuts off the 12VDC power to the main 12V fuse panel, and the
interior of the vehicle. Batteries can still be trickle charged by the
converter, and there will still be power to some devices.
Rotating Dial Disconnect Switch
When this switch is ON, there will be a green area showing a
"1" along the top of the switch. To turn the switch OFF, turn it
counter-clockwise until you see the red area along the left side of
the switch showing a "0" (zero).
Lever Type Disconnect Switch
To operate this switch, turn the lever counter-clockwise to turn
off all 12VDC power to the fuse panel in the RV. The lever can
be removed and is equipped with a lanyard to keep the key from
getting lost.
Section 6: Electrical System
Battery Disconnect
Switches
(switch appearance
may vary by model)
95
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