Thanks for the responses so far. Good idea regarding the alternator Tesla. Greg, I am all over the books. This is a remote mission center where most of the work has been done by previous visitors from other countries. As usual stuff gets added and they have voltage drop problems. The idea is to give some theory behind the work that they already do as they have learned how to do things that they do not necessarily understand why or the consequences. Example they know how to add circuits so they continue to do that until they have everything overloaded. You know what the quick fix is for that right.