I'm pretty sure that Ample Power uses Hehr Powerline alternators, which have
a +12vdc stud and a ground stud on the back.

"Jerry W" wrote in message
...
Helping a friend with charging problem. I can feel (but not see) the back
end of his 100 A alternator and feel two large studs with heavy cables
attached. Is one +12V and the other ground or is the output being split
between the two studs and grounding thru the case??