Re: tach needle bouncing with tach filter already installed
No, no indication on ammeter - if connected by OEM design.
Ammeters are generally hooked in series with the charge line showing the usage/charging of the battery and not the alternator output, ie, BATT stud.
Battery is another parallel circuit with the vehicle's electrical system.
Once alt is working, alt supplies power to all circuits and recharges battery.
Once alt has too low of RPM or more demand than alt can supply, and then battery supplies power.
So, ammeter shows current activity of the battery - unless an ammeter has been installed on BATT stud, then it will show alt activity.
Voltmeter measures electrical system pressure - volts - at any one point of the electrical system.
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