Alternator not charging. Trying to identify the solid-state looking box in the photo below the voltage regulator. The plug on this box has no power at any of its three wires and it connects to the voltage regulator. Tried full-fielding the alternator but no output. I don't see this box in the diagram in my Bentley manual but that covers 78-83. What is it and what are the wires from on the plug that goes to it? (brown, black and blue)
