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26-SI ALTERNATOR
1G/287 4/96
PAGE
8. Recheck voltage at insulated battery terminal. Voltage
should be higher than previous reading, but below 15
volts on 12-volt system (31 volts on 24 volt system).
- If reading is lower than previous reading (Step 6), refer
to section on No Output.
- If reading is higher than 15 volts on 12-volt system (31
volts on 24-volt system), refer to section on High
Voltage Output.
9. Turn carbon pile load on and adjust to obtain maximum
alternator output on ammeter. Record maximum output.
With alternator still running at maximum output, check
and record voltage drop in ground circuit between
alternator housing and grounded battery terminal. Then
check voltage drop from output terminal to battery
positive. Turn carbon pile load off.
Maximum ampere output should be within 15 amps of
output rating stamped on alternator identification plate,
or as listed in Specifications section of this manual.
Voltage drop should be 0.25 volts or less for each
voltage drop test on 12-volt system (0.5 volts or less on
24-volt system).
- If ground circuit voltage drop is over 0.25 volts on 12
volt system (0.5 volts on 24-volt system), clean and
tighten all ground circuit connections. If this does not
correct excessive voltage drop, check ground circuit
cables for improper sizing or high resistance conditions.
Correct as necessary.
- If within 15 amps of rating, alternator is good. Look
elsewhere for cause of problem.
- If more than 15 amps below rating, repair or replace
alternator.
Figure 9. Rated Output Check
26-5017
CLAMP-ON
AMMETER
CARBON
PILE
BATTERY
F5
F9
F6,F8
VOLTMETER
A
V
ALTERNATOR
7