I have a 12v Delco gen on a 235 in my 49 3100. I'm expericing a discharge indication during increased RPM's and a charge at idle. Just the opposite of what is supposed to happening. This problem is intermentent. Gen is putting out per the spec. wiring is all new and connections tight. Gen has been polrized. Could this be caused by a poor gound of the voltage regulator? Any suggestions?