How to test amprage on an Alternator - Chevy Nova Forum
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Old 7th-March-2011, 10:35 PM   #1
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How to test amprage on an Alternator

Can someone explain to me how to test output amprage on an alternator?thanks bm
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Old 7th-March-2011, 10:44 PM   #2
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Hook up an ammeter to your battery while running. Check at idle as well as elevated rpm (enough to excite the alternator, usually 1,500 or more)
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Old 8th-March-2011, 02:55 AM   #3
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You will also need a way to create a load on the system, or you will just see the draw from whatever electrical devices are currently running. Be careful how long you test it at max draw they can burn up pretty fast
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Old 8th-March-2011, 04:56 PM   #4
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Find a good auto electric shop. We have one here in West Palm Beach that has a killer alternator test bench. Not the simple Advance auto or Autozone kind.

I had alternator problems and took it to them and they identified the diode trio, told me how to change it, and sold me the part for $5!

They then ran it up again and showed me my 140 amp 12si only puts out 105 amps.
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Old 8th-March-2011, 05:18 PM   #5
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If you're looking for a serious high amperage alternator, Irragi alternators was what was preferred when I was doing serious, multi-thousand watt audio installs. When folks need more amperage for their audio system than most house holds use in a week it gets insane!
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