The generator usually shows little to no charge at slow idle. The battery will be supplying power.
Some negative chassis regulators get used on positive chassis equipment and suffer shorter life.
It's important to get the cutout and voltage regulator set correctly. The cutout needs just enough tension to ensure it opens when the trator is shut off.
The voltage needs to be set with a voltmeter and a fully charged battery. Setting the regulator via the ammeter like most old timers did caused the battery to be chronically under or over charged.
As previously stated every connection must be clean and tight. Contact through a newly painted regulator to a newly painted generator is iffy.
Fluxuating current can be from dirty,stuck brushes/holders or a dirty/out of round commutator with high mica.
12V is often a bandaid fix that covers the symptoms but not the causes.
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