charging issues

after all the threads and issues with charging problems,( and i have made my share of suggestions) and instead of searching every where for answers, i wanted my own thread for reference. heres the deal, brand new battery, good alternator (or at least it was) new voltage regulator (thats not to say it is a good one) engine to body ground good, battery to engine ground good, starter relay to body ground good. i have noticed lately that my alternator gauge has been gradually showing more and more of a charge when the rpms are up and more of a discharge in gear, but is pretty much centered when idling at about 700-750 rpms. today i went down to the store and i hauled *** to get back home because it was showing such a charge i did not want to risk the thing catching on fire somewhere. the car is a 73 duster with a V8.in the past i have always been able to fix the problem replacing the above parts.could this be as simple as the alternator going bad or something worse. i dont have a tester or meter at the moment, maybe i am overlooking something simple that you guys can help me with? with the car running, i pull off the green wire field (see pic) the rpms increase and the gauge shows a discharge. when i pull the blue wire off, nothing happens but the gauge show a discharge. if i switch them, i get the same exact result at their respective fields. i took pics while i was driving to show what it is doing.the first pic is at idle. the second is in gear and the third is driving down the road. the gauge increases with rpms but stops where you see at its highest point no matter the rpms. can this car burn up wiring with gauge showing such a charge? is there anything normal about this?i have felt around inside and out for any warm wires and i didnt feel anything but i couldnt get to all of them. im trying to be as clear as possible. thanks for your help.