Ok, you failed to tell me what year and model we're talking about here so my information will be more generalized.
First, test the output of you charging system at the battery. The battery must be fully charged for this test. Make sure all connections are tight and clean. You'll need a DVOM (digital volt ohm meter) to do the test. Connect the red meter lead to the positive post, the black lead to the negative post. Put the meter function switch in "DC VOLTS< 20 Volts or greater scale. Start the engine and bring it to a high idle. You should read 14.5-15.0 volts at the battery.
To test the stator, follow the wires from the regulator down to the engne case and where the connector where they plug in. Unplug the connector and inspect the metal contacts inside the engine case or connector on the stator side. Set you meter function switch to AC VOLTS> 25 Volts or greater. Start the engine and bring it to a high idle. Touch each metal contact in the engine side of the connector with a test meter lead. You should read 25 volt AC or better.
If the stator test good, replace your regulator. make sure the ground is good on the regulator.
Good Luck
Steve
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