© 2020 Pierce Manufacturing Inc. All Rights Reserved. General Operation / 5-13
OPERATION
5-5. Electrical
5-5.1 Alternator
All alternators in Pierce Custom Chassis are of the self-energizing type. Start-up of the alternator is delayed until the
engine oil pressure reaches operating levels. This design avoids the situation where the alternator attempts to make
up for the heavy battery drain caused by starter operation. This reduces the cranking torque required and protects
the voltage regulator from overload. It is therefore normal for the voltmeter to register a lower value for several
seconds during and following the starting procedure until the engine oil pressure rises sufficiently to activate the
alternator.
5-5.2 Ammeter (Optional)
The ammeter displays the amount of current being supplied to the battery by the alternator or the rate of discharge
from the battery with the engine running. A slight charge to the battery will be indicated even with the batteries fully
charged.
Always observe proper polarity when making connections to the electrical system. Improper
connection of batteries, jumper cables, and charging systems can cause damage to the electrical
system or to the alternator.
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