INTRODUCTION
The Model 091-139-2-12 AUTO ISOLATOR I system is a lossless isolator
replacement for the conventional diode isolator. Designed to be installed in a
vehicle with one or more Main batteries that must be isolated from one or more
auxiliary batteries. The system consists of a voltage detector and controller
Model 091-139-CONT-12 and a separate 200-ampere rated solenoid, Model
091-139-SOL-12HO for switching the batteries. In addition to maintaining battery
isolation the AUTO ISOLATOR I may parallel the batteries on engine starting if
the auxiliary battery has sufficient charge to assist in the cranking. A block
diagram of the system appears in figure 1.
AL
T
E
R
N
A
T
O
R
MAIN
BATTERY
AUXILIARY
BATTERY
PARALLELING
SOLENOID
STARTER
SOLENOID
STARTER
PUSH BUTTON
MAIN
BATTERY
VOLTAGE
DETECTOR
AUX.
BATTERY
VOLTAGE
DETECTOR
STARTER
ISOLATOR
SOLENOID
DRIVER
PO
W
E
R
IGNITION
SWITCH
TIMER
Figure 1
Block Diagram
MAIN BATTERY SENSE
AUXILIARY BATTERY SENSE
