Memorial Super Moderator
Join Date: Jul 2009
Location: Sunshine Coast,Queensland, Australia
Drives: 2005 Kia Cerato LD [2L petrol] manual, 1986 Nissan Pulsar hatch
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Checking an alternator with a multimeter.
Checking an alternator. Start with a fully charged battery.
1. Switch on all lights for 5 minutes to reduce the charge in the battery and apply a load to the circuit.
2. Start the engine and bring revs to around 2500. An amp reading across the battery terminals should be around 75% of the alternators rated output.
3. Switch off all lights and run the engine at 1500-2000 revs until the indicated charge is below 10 amps. A volt reading should now be between 14 and 15 volts.
If the voltage reading is above 15 or below 14 the alternators voltage regulator is faulty.
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Last edited by pulsar86; 03-11-2010 at 04:02 PM.