A fully charged battery should be around 13 to 13.2 volts.
An undercharged battery is below 12.3 volts.
A battery that shows around 11 volts or less is effectively dead.
To check charging voltage, start the engine and warm it up.
Connect the voltmeter across the battery posts.
With the headlight high-beam on, rev the engine to 5000 RPM and measure the charging voltage. The charging voltage should be around 13.5 to 14.5 volts, but less than 15.5 volts.
For the battery current leakage test, with the ignition switch OFF, disconnect the negative battery cable, and connect the meter to the negative battery post and negative cable end.
Set the meter to measure Amps, start at the high scale and work downwards.
The maximum current leakage should be .1mA max.
If greater than .1mA, you may have a short somewhere.
For the stator windings, disconnect the 3-pole connector from the alternator to the regulator/rectifier unit.
With the meter set to measure resistance (ohm/horse shoe symbol) (with ignition OFF), measure the resistance between the three pins. The resistance should be .2 to .5 ohms for each coil.
If less than .2 ohms, you may have a shorted winding.
Measure from each pin to ground. There should be no continuity.
If there is, you have a short in a stator winding.
Last edited by SubSailor; 10-24-2010 at 11:14 PM.