im need some help on a 30 kw gen. i have voltage going to the exciter stator when i energize the gen but i only get low hertz and very low volts. when i release the switch i get zero hertz zero volts. im learning how to work on gens by OJTso please bear with me. the exciter circuit checks good to the stator, it acts like the wants to build a field and then drops off. can a winding that checks good for resistance fail when voltage is applied? i probally did not give enough info for you so i hope you can give me some direction in this. the only thing i have for trouble shooting is a DVOM. thanx