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Alternator Test
1. ANALYZING CHARGING SYSTEM DATA: After you press the
NEXT
soft key to begin the
alternator test, the EXP will immediately begin testing for alternator voltage.
2. TURN ALL VEHICLE LOADS OFF, IDLE ENGINE: Turn off vehicle loads (blowers, interior
light, radio, etc.) and idle the engine. Press the
NEXT
soft key to continue.
NOTE:
If necessary the analyzer will ask if you are testing a diesel engine. It will
resume testing after you make your selection.
. REV ENGINE WITH LOADS OFF FOR 5 SECONDS: Rev the engine with the loads off.
Gradually increase the rpm until the analyzer tells you to HOLD the rev level as the bar on
the display crosses the rpm target line.
NOTE:
Some 8-cylinder and older vehicles idle at a high level after starting, allowing the
analyzer to detect the rev automatically.
4. ACQUIRING DATA....HOLD ENGINE RPM: Continue to hold the rpm while the EXP takes
system measurements.
5. ENGINE REV DETECTED, IDLE ENGINE: The EXP has detected the rev. Press the
NEXT
soft key to continue.
6. TESTING ALTERNATOR AT IDLE, LOADS OFF: The analyzer will next test the engine
at idle for comparison to other readings, and then test the diode ripple. Excessive ripple
usually means one or more diodes have failed in the alternator or there is stator damage.
7. TURN HIGH BEAMS AND BLOWER MOTOR ON, IDLE ENGINE: After a few seconds, the
EXP will ask you to turn on the accessory loads. It will determine if the charging system is
able to provide enough current for the demands of the electrical system.
IMPORTANT:
Turn on the high-beam headlights, the blower to high and the rear defogger.
Don’t use cyclical loads such as air conditioning or windshield wipers.
8. TESTING ALTERNATOR AT IDLE, LOADS ON: The analyzer will determine if the charging
system is able to provide sufficient current for the demands of the vehicle’s electrical
system.
9. REV ENGINE WITH LOADS ON FOR 5 SECONDS: The EXP will test the charging system
with the loads on and prompt you to rev the engine. Gradually increase the rev until the
analyzer tells you to HOLD the rev level as the bar on the display crosses the rpm target
line.
10. ACQUIRING DATA....HOLD ENGINE RPM: Continue to hold the rpm while the EXP takes
system measurements.
Chapter 6: System Test
Summary of Contents for intellect EXP-1000
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