Checking the voltage drop at the positive andnegative alternatorterminals
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Checking the voltage drop at the positive and
negative alternator
terminals
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1.
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Connector a voltmeter across
the battery's positive terminal and
terminal B+ on the alternator (insulated side).
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2.
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Run the engine at 2500 rpm and apply an electrical load to the
alternator by switching on all the lights, for instance.
Read off the instrument.
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3.
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Connect a voltmeter across the battery's negative terminal and terminal
B- (ground) on the alternator.
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4.
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Run the engine at 2500 rpm and apply an electrical load to the
alternator by switching on all the lights, for instance.
Read off the instrument.
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5.
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The readings in points 2 and 4 should not exceed 0.5 V. If a higher reading is
obtained, check the relevant
circuit for shorting/continuity.
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