Battery Isolation Manager - THOR Class C Series Owner's Manual

C H A S S I S
5
Typical battery isolation manager. This device
is usually located in the battery compartment of
the motorhome.
54
If the alternator is not keeping pace with the draw on your motorhome's electrical system while
driving down the road, it means it is working in a negative mode: more power is being used
than the alternator is putting out. This means that you are taking power out of the batteries. If
you draw too much power from your batteries there may not be enough power left to start the
motorhome or run any of the 12 volts DC appliances when you stop for a break or for the night.
The alternator will charge at a higher rate right after the motorhome has been started,
replacing the power used to start the vehicle, but the charging should quickly go back to
"normal" and hold its own even when you turn on lights or appliances.
If the alternator shows a discharge while the motor is running, turn OFF appliances and lights
to see if a charge comes on or if the alternator indicates "neutral". Then apply a drain on the
system to see if a discharge returns. If a discharge persists, contact your dealer.
When stopped at a campsite that allows you use of the shoreline, the 120 volts AC electrical
system will recharge your auxiliary battery. Under heavy usage in warm weather, check the
fluid level of those batteries that require attention to fluids quite often. Low battery fluid level
is very harmful to the battery's longevity.

Battery Isolation Manager

Unless you intend to run the vehicle engine, keep the ignition switch in the OFF
position. Doing so will:
1. Reduce the risk of unnecessary chassis battery drain.
2. Allow the Battery Isolation Manager to connect the chassis battery to the house
battery charging system.
When the motorhome engine is not running, the chassis and house battery(ies) are electrically
isolated by the use of a battery isolation manager. This controller prevents house power
consumption from discharging the chassis battery while the motorhome is parked.
CAUTION
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