Test batteries for
weak cells.
Replace alternator.
Connect voltmeter between alternator 24-volt terminal and ground terminal.
Take reading with cab power ON and engine running.
POSSIBLE CAUSES
Belt loose or broken; No input to alternator terminals; Damaged alternator;
Corroded or loose battery connection; Battery is damaged.
CHECKS
Check fan drive belt and alternator belt for correct tension.
(See engine manual for belt specifications.)
Ok
Not Ok
Zero Volts DC
27.2 Volts DC or more
20.8 Volts DC or less
Tighten fan drive belt/alternator
belt. Replace belt if worn.
Repair wiring or
connections.
Problem 4
Engine runs, but battery is not charging.
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