Charging System Test; Charging System Test Results - Midtronics EXP-1002 Instruction Manual

EXP-1002

Charging System Test

3. ANALYZING CHARGING SYSTEM DATA: After you press
NEXT to begin the alternator test, the tester will immedi-
ately begin testing for alternator voltage.
4. TURN ALL VEHICLE LOADS OFF, IDLE ENGINE: Turn off ve-
hicle loads (blowers, interior light, radio, etc.) and idle the
engine. Press NEXT 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.
5. 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.
6. ACQUIRING DATA....HOLD ENGINE RPM: Continue to hold
the rpm while the tester takes system measurements.
7. ENGINE REV DETECTED, IDLE ENGINE: The tester has de-
tected the rev. Press NEXT to continue.
8. 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 alter-
nator or there is stator damage.
9. TURN HIGH BEAMS AND BLOWER MOTOR ON, IDLE EN-
GINE: After a few seconds, the tester will ask you to turn on
the accessory loads. It will determine if the charging sys-
tem 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 wind-
shield wipers.
10. 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 electri-
cal system.
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11. REV ENGINE WITH LOADS ON FOR 5 SECONDS: The tes-
ter 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.
12. ACQUIRING DATA....HOLD ENGINE RPM: Continue to hold
the rpm while the tester takes system measurements.
13. ENGINE REV DETECTED, IDLE ENGINE: The tester has de-
tected the rev. Press NEXT to continue.
14. ANALYZING CHARGING SYSTEM DATA: The tester is com-
pleting its final analysis of the charging system data.
15. TURN OFF LOADS AND ENGINE: Press NEXT to display the
results.

Charging System Test Results

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Chapter 3: System Test
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