Never- - - - -EVER- - - -use a file or sandpaper on voltage regulator points. They contact each other with a slight wiping action, and the scratches left by a file or any sort of abrasive will cause them to stick. They are also pure silver, and very soft. Use a clean piece of stiff paper like a business card or an index card to burnish any oxidation off the points and check the setting of the point spring tension with the engine running at a fast idle and a known fully-charged battery with a specific gravity reading of at least 1.260 on all the cells. The battery terminal voltage should be at least 13.8, with a maximum voltage of 14.7. Once the metal cover is reinstalled after adjusting the voltage setting, the voltage will drop approximately 0.2 V due to better magnetic conduction of the metal cover.
JKerry
