Lesson 1/Learning Event 1
FIGURE 7. VOLTAGE REGULATOR CIRCUIT.
This unit operates much like the current regulator, except that it senses voltage instead of current
and limits the generator's voltage to a safe value. This protects the battery and other electrical
components from a voltage high enough to damage them.
Direct Current Charging System Inspection
An ammeter or battery indicator is connected between the generator regulator and the battery and
is mounted on the instrument panel of a vehicle. This gives us a way of checking the action of the
generator. Current flowing from the generator through the ammeter to the battery, when the
engine is running, will cause the ammeter pointer to move in a positive or charge direction. If the
engine is not running but the lights are on, the pointer will move in a negative or discharge
direction. Use of the ammeter to check the generating system can be of great help to both the
operator and the repairman. Any indication of a constant high charge or discharge should be taken
care of at once.