You can play guessing games - or you can stick a amp meter on the system to find out for sure what is going on.
Voltage only comes up after the amperage flow and demand slows down. If a battery is going bad, and is constantly absorbing a charge of current, the voltage cannot rise properly.
Not much different that a water system that can build high pressure with the faucet held wide open.
If the alternator is not working properly, it is still sort of the same situation as a bad battery. Not enough amperage is being provided to satisfy the need and let the voltage rise.
You could also have a situation where the battery and alternator are working fine, but there is an excess current draw on the system.
Very often, Delcos lose part of the diode trio and lose some charge capacity and can cause this - as well as many other things.
The whole deal could be diagnosed in 10 minutes with an ampmeter.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
... [Read Article]
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