Kussmaul Electronics 091-139-2-12 - Manual (Page 3)

SYSTEM OPERATION
The system receives its power from the ignition switch. With the switch “OFF” all the power
is removed from the system and the solenoid is deenergized.
As soon as the operator turns the ignition “ON”, the system is powered and detects the voltage
of the main and auxiliary batteries. If the auxiliary battery voltage is 12.4 volts or greater,
(indicating sufficient charge) cranking the engine will cause the paralleling solenoid to be
energized. A 10-second timer will maintain the paralleling solenoid if the engine doesn’t start
immediately and must be cranked a second time. When the engine starts the alternator output
raises the battery voltage. This increase in voltage is detected and the paralleling solenoid is
held energized charging both batteries.
If when the engine is started the auxiliary battery voltage is below 12.0 volts the paralleling
solenoid is not energized while cranking. As soon as the engine starts, the alternator raises
the main battery voltage and the solenoid is energized charging both batteries.
Upon engine shutdown the ignition switch is placed in the “OFF” position. Power is removed
from the Auto Isolator and the solenoid is deenergized.