Operator`s manual

MAINTENANCE AND LUBRICATION
468
If the battery voltage continues to drop and the second level is
reached, the LED blinks at a different rate than the first level. All
remaining sleeper circuits and designated cab circuits will be disabled.
In the second level, pressing the fan speed switch will
override both levels of battery protection, enabling all
circuits that were off.
The clock display will also be turned off, by 5 minute
interval times. This time starts after any key is pressed
and is restarted during any key press.
When the batteries are charged, either through the vehicle alternator or
a connected battery charger, the monitor will automatically restore
power to the disconnected circuits.
Unless the batteries are held at an elevated voltage for several hours,
they will only develop a “surface” charge. That charge will quickly go
away and the system will retrip.
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