Operation and maintenance manual

QSB4.5 and QSB6.7 Alternator
Section A - Adjustment, Repair, and Replacement Page A-5
Connect a carbon-pile load (battery/alternator tester)
across the batteries in one of the battery boxes.
Clamp an induction pickup-type ampere-hour meter
around the battery cable; or use the digital multimeter,
Part Number 3164488 or 3164489, with the clamp-on
current probe, Part Number 3164490.
WARNING
Batteries can emit explosive gases. To reduce the
possibility of personal injury, always ventilate the
compartment before servicing the batteries. To
reduce the possibility of arcing, remove the negative
(-) battery cable first and attach the negative (-)
battery cable last.
WARNING
Acid is extremely dangerous and can damage the
machinery and can also cause serious burns. Always
provide a tank of strong soda water as a neutralizing
agent when servicing the batteries. Wear goggles and
protective clothing to reduce the possibility of serious
personal injury.
Disconnect any cables that lead to any other battery
boxes in the circuit, negative (-) cables first.
Operate the engine at high idle; and measure the
alternator voltage output to the batteries with digital
multimeter, Part Number 3164488 or 3164489. Refer to
the OEM specifications.
Operate the engine at high idle and adjust the carbon-pile
load-testing equipment to apply the maximum rated
amperage load to the alternator. Refer to the OEM
specifications.
NOTE: The alternator maximum rated amperage output is
normally stamped or labeled on the alternator.
Measure the alternator amperage output. Refer to the
OEM specifications.
If the alternator output (amps) is not within 10 percent of
rated output, repair or replace the alternator. Refer to the
OEM service manual for repair procedures.