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What are specs for volt meter that's fast enough to read our alternator DC volts

Junkman
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Junkman

Junkman

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I need to buy a better volt meter because my alternator is going out and I want t measure AC voltage on the replacement before leaving the store.  I don't want to spend the money on a Fluke and am looking at an innova 3340. Will this work?

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Mopar1973Man

Mopar1973Man

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As long as the meter can read variable frequency AC as well as AC voltage in the millivolt range. Typically a good alternator is 10 to 30 mV AC 

 

Marginal is 50 to 90 mV AC. (This range is hard to define some truck have issues as low as 50 mV and some tolerate as high as 90 mV rather well depends on mods and accessories.)

 

Fail is 100 mV AC.

Edited by Mopar1973Man
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