voltage fluctations

Well it is on my 73 340 Charger. And I have read a "crap" load of info before posting as not to waste anyones time but most of what I have read is from you 67Dart273. You come very highly recommended LOL
I find it odd that I first noticed it went the temp gauge stated it's climb into the 230s.
I have like most had Mopars that drop voltage when lights come on, fans etc but give it some gas and up goes the volts... lights brighter yada yada but in this case they didn't, which leads me to belive the VR is bad. It seems to charge and discharge as it pleases. But you the man 67dart what do you recommend?
Thanks
Al