Also, check for any corrosion between the voltage regulator and the alternator housing. This is something that caused my alternator to not charge. The corrosion I found was on the regulator, where it grounds to the alternator chassis. A little cleaning with an old typewriter eraser (mild abrasive) and a dab of silicon grease to block any future problems.

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Sam

84 300SD 350K+ miles ( Blue Belle )