Fixing things and the future of society.

Sunday, December 4, 2022

Test an alternator

Camry owner: 1997 CE V6 4 door. New battery, New alternator. Voltage at battery reading 11.5V, fuses good but there’s no voltage coming out of alternator. It is brand new, would that just be a faulty alternator or is there something else I can test?

Intelligent tinkering: First just make sure you haven't disconnected the alternator to test it, because, sorry, but it sounds like you have. The stock alternator needs a field coil charge to work, so you test it connected as normal with the engine idling. It should be 13.5 to 14 or so volts across the battery terminals. (This is not true for a permanent magnet alternator, usually found in ambulances and food trucks, 12V generators as in an old VW, or dynamos found in old tractors and whatnot. Those will make power without field charge.)

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