(2) To keep the battery from discharging during the inoperational
periods of the vehicle, another switch was required. So another relay, called a
line switch, was incorporated as part of the regulator (foldout 1). The line
switch relay is operated by the ignition switch, so when the ignition is turned OFF
the battery is disconnected from the generator through the normally open switch
(3) Through the years the line switch relay has assumed many different
The most common of these names are listed below.
(a) Cutout relay.
(b) Reverse current relay.
(c) Load relay.
(e) Line switch relay.
e. Depending upon the application, the sensing relay for regulating the
field current is of special design. Many regulators contained a current
OS 010, 5-P5