[Richard]

That is the regulator. However that is a replacement. So a prevoius owner has had an alternator problem before. If you look at the black above the regulator you will see the four screw holes where the orig reg was mounted.

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Can you post a pic of the right side inside the electrical box? Cause you are around the time newell switched from solenoid connection of alternator to battery to diode based isolation. A quick pic will tell the tale.