Maybe I should apologize. I try to keep posts short and simple.
Too much info can be both un-nessesary and overwhelming.
You'll have to have a multi meter to properly dianose most electrical problems just like you would have to have a hammer to drve nails.
There are only 2 shape/size voltage regulators. You will have one or the other. Black box like pictured above or one that looks a bit like the igbition module. Connector plug in the face side of it has a metal retainer clip.
Hope this helps