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Re: which AMMETER is correct???
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Posted by captaink on April 29, 2005 at 06:56:15 from (66.115.214.56):
In Reply to: which AMMETER is correct??? posted by farmall john on April 27, 2005 at 04:59:31:
To answer your question, how many amps does your charging system put out? If you are running a 12-volt alternator, you can get them to put out more than either the 30 or 60 amp ammeter will show. Under normal circumstances, a 30 will work just fine. As far as the Volt/Ammeter discussion goes, both are useful devices however neither alone will tell the whole story of an electrical system. The volt meter will tell you how many volts are in the system. If the charging device is in good working order it will show around 14 volts (+ or � a bit) while the engine is running and then settle back to around 12 to 12.5 when it stops. If there is a 3 amp drain in the system, the voltage will not drop enough on a volt meter to be noticed. Likewise, if the voltage regulator is starting to get bad, the ammeter may set on 0 or up an amp or two looking normal but the charging device may be putting out less than 12 volts. To get the complete story on a charging system you need both ammeter and voltmeter. However, the ammeter is the more common and in my opinion the more useful of the two in day to day operations.
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