131 Eisenhower Lane North
Lombard IL 60148
630 268 0010 / 1 800 251 2408
www.intellitec.com
Intellitec
P/N 53-00696-241 Rev. B 032105
REVERSE BATTERY PROTECTED BATTERY GUARD
INSTALLATION & SERVICE MANUAL
2
HOW IT WORKS
The Reverse Battery Protected Battery Guard is used as a main battery disconnect for both the 24 volt and the 12
volt batteries in a dual battery system or the 24 volt battery in a single battery system. It also provides battery run-
down protection and protection from reverse battery installation. The system consists of a control module, one or
two latching relays, and a dash-mounted switch. The system provides a number of features, including Master
Disconnect, battery run-down protection and reverse battery protection.
The Master Disconnect feature allows the driver to disconnect both the 24 volt and 12 volt batteries at the same
time, from the dash-mount switch. This can be done with the ignition on or off. To switch off the batteries, the driver
presses and momentarily holds the Master Disconnect switch in OFF position. If the ignition is on, the system will
interrupt the power to the ignition system prior to disconnecting the batteries. When the batteries are connected,
the indicator on the dash-mount switch will be illuminated. If the batteries are disconnected, the indicator will be
flashing. To reconnect the batteries, the driver presses and momentarily holds the switch in the ON position.
If the ignition is off, the system constantly monitors the batteries for drain by measuring the voltage of the batteries.
If the voltage falls below 24.0 volts for more than 4 minutes, the system will disconnect the batteries to prevent
further discharge. The
indicator light, will begin to blink two minutes prior to disconnecting, to alert
the driver of the impending shut-down.
If the battery cables are removed, the unit senses the sudden drop in voltage and opens the disconnect relays.
When the batteries are re-connected, the relays are open and the batteries must be connected in the correct
polarity before the system will close the relays, thereby preventing the application of reverse polarity to the vehicle's
electrical system.
There is an input to the module that allows the indicator light to be extinguished for dark running operation. When
this input is high, the indicator will be off.
The module is potted and contains no user serviceable components. The electronics in the module control the
latching solenoids to perform the functions described above.
The Latching Relays (Intellitec Part # 00-00507-024) operate by the momentary application of voltage to the coil
terminals. When the voltage is in one polarity, the relay is pulled in and latched. When the voltage is applied in the
opposite direction, the relay is un-latched. The control electronics in the module perform the application of the
power to the relays.
Master Disconnect
Battery Run-Down Protection
Reverse Battery Protection
Indicator Light Extinguishing
The Module
Latching Relay
Master Switch
