Matco Tools MBT1015 - Testing with Electrical Load at 2,000 RPM

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MBT1015 rev-C User’s Manual Versio18.08
4. Press key will show the results of the test (Fig.52):
5. If either minimum or maximum charging volts are not within the voltage range
limits then it will display one of the screen as below (Fig.49 & 50) and it will
prompt you to check the charging system for the fault.
6. Just press key if you need to printout the results.
Testing with electrical load at 2,000 RPM
As more electrical accessories, such as lights, rear demister, heater, car stereos,
etc. were used; the electro-motive force decreases and this will allow more
amperage from the alternator to flow into the battery to compensate for the added
load. This test is to check the alternator’s behavior during loading.
Fig.52
Fig.53 Fig.54
Results: Good
At 3,000 rpm,
No load Test:
Average Charging
Volts: 14.2V
[Enter] to Load Test.
Results: Low charge
At 3,000 rpm,
No load Test:
Min. >13.3V: 13.2V
Check for loose belt
and the alternator.
[Enter] to Load
Results:High charge
At 3,000 rpm,
No load Test:
Max. <1
5.0V: 15.6V
Check alternator
and the regulator.
[Enter] to Load